TF TnP - Revision history

Foretony at 22:29, 13 October 2015

2015-10-13T22:29:18Z

← Older revision		Revision as of 22:29, 13 October 2015
Line 1:		Line 1:
	I submit for your consideration my application for ~~tenure at~~ the rank of ~~Associate Research~~ Professor ~~in the Physics program of the College of Arts and Sciences~~ at Idaho State University.		I submit for your consideration my application for promotion to the rank of Full Professor at Idaho State University (ISU). This cover letter is intended to introduce the general aspects of my career at ISU that are more fully described in the promotion application package.

	~~I joined the Physics program at~~ ISU ~~as an Research Associate Professor of Physics on August 14, 2006~~. ~~The university's expectations for my position were clearly described in my offer letter which I have included in this application. As described in my offer~~ letter~~, a research professor~~ is ~~expected~~ to ~~spend 60%~~ of ~~their time on research, 20% on teaching, and 20% on service. The research expectation was~~ that ~~I attract approximately $150,000 in external funds~~ in the first 5 years and publish 2 peer reviewed works per year. I was also expected to teach one, three credit graduate level class per semester, advise graduate students and develop curricula to enhance ISU's offerings in nuclear science. My accomplishments in each of these endeavors is summarized below and the specific details are organized in separate sections.

	My research ~~activities~~ at ISU ~~have resulted~~ a ~~series~~ of ~~external grant totaling $1.4 Million,~~ the ~~creation~~ of a ~~Laboratory for Detector Science~~, and research ~~program~~ in ~~nuclear physics based~~ at ~~Jefferson Lab and the Idaho Accelerator Center~~.		I joined ISU as a tenure track Research Associate Professor on August 14, 2006. I was fortunate to join a department that is focused on my discipline, nuclear physics, and is associated with a dedicated research facility, the Idaho Accelerator Center (IAC). I was awarded tenure at ISU on March 15, 2011. The Dean of the College of Science and Engineering changed my position to a tenured Associate Professor to align my “skills and efforts with the needs of the College of Science and Engineering and the funding available” on October 29, 2013. As a result, my teaching and research duties became commensurate with a regular academic faculty position in the Physics Department at ISU.

			My teaching career at ISU was primarily focused on graduate education and has only in the last two years been expanded to include undergraduate classes. I developed four new graduate level courses at ISU. Two of these have been adapted so they may be cross listed as senior level undergraduate courses that are now offered to students every year. My student evaluations have consistently been between the “good” and “excellent” rating each year.

	~~My teaching activities~~ at ISU have ~~focused on graduate student instruction~~ and ~~advising as well as developing~~ three ~~new classes for~~ the graduate ~~curricula~~.		I established the Laboratory for Detector Science at ISU to teach students the art of detector development and to facilitate the construction of detectors for research. I used this facility to design, construct, and test detector systems for research at the Thomas Jefferson National Accelerator Facility (JLab) managed by the Department of Energy in Newport News, Va. A project to construct five drift chambers for the detector upgrade in JLab’s Hall B was successfully completed recently. The detectors have been delivered to JLab and shown to be functioning normally. In addition to students, the project trained three people from the Pocatello area who moved on to technical jobs at ON semiconductor. Three Ph. D. students have used the facility to complete their graduate studies.

	My ~~service acitivities~~ at ISU have been in the ~~form~~ of a ~~GFR, a member of~~ the ~~Engineering Graduate ???,~~ and ~~a Faculty Senator~~.		My research program at ISU investigates both fundamental physics as well as physics applications. My work at Jefferson Lab is focused on using polarized electrons to probe the quark contribution to polarized nucleon observables. While my main focus was an evaluation of the duality principle for polarized structure functions, I have also been one of the main contributors to the collection and analysis of polarized structure function data for Hall B’s EG1 group at JLab. I am currently preparing to continue those measurements with a focus on measuring the fractional down quark polarization in the nucleon using the energy upgraded accelerator at JLab and Hall B’s detectors. This research program has been continuously funded by the National Science foundation since I started my second year at ISU in 2007.

			My work in physics applications has been in the area of positron production using electron accelerators. I was awarded a grant to investigate the efficiency of producing positrons using a 10 MeV incident electron beam at the IAC. The research complimented my work in the Polarized Electron for Polarized Positrons (PEPPo) experiment using JLab’s injector. The goal at the IAC was to investigate positron production efficiency using a quad triplet collection system while the goal of the PEPPo experiment was to quantify the polarization transferred to positrons produced using an incident polarized electron beam. The results indicate that at least one polarized positron can be collected and transported for every million electrons that impinge a thin Tungsten target. This work is continuing at ISU as an SBIR initiative and can be used to develop a polarized positron source that will facilitate charge symmetry measurements at Jefferson Lab.

			I have left further details of my teaching, research, and service to the relevant sections of the promotion application form. I offer this dossier for your consideration of my application for promotion to Full Professor at Idaho State University.

	= CV=		= CV=

Foretony: /* Research Summary */

2015-09-11T17:39:44Z

Research Summary

← Older revision		Revision as of 17:39, 11 September 2015
Line 103:		Line 103:
	I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.		I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.

	My current efforts are focused on using JLab's upgraded Hall B to measure the fractional down quark polarization in the nucleon. I will use the CLAS12 detector in Jefferson Lab's Hall B to measure the cross-section helicity differences for positive and negative pion production from a polarized proton and deuteron. This combination of measurements will allow an extraction of the down quark polarization as a function of how large a fraction of the nucleon's momentum was carried by the struck quark. Perturbative quantum chromodynamics predicts that the down quarks will carry all of the nucleon's polarization if they carry all of its momentum. A modern quark model, with hyperfine interactions, predicts that the down quark's polarization contribution will ~~appose~~ the nucleon's net polarization. The planned measurements should discriminate between these contradictory predictions with a statistical precision of two standard deviations.		My current efforts are focused on using JLab's upgraded Hall B to measure the fractional down quark polarization in the nucleon. I will use the CLAS12 detector in Jefferson Lab's Hall B to measure the cross-section helicity differences for positive and negative pion production from a polarized proton and deuteron. This combination of measurements will allow an extraction of the down quark polarization as a function of how large a fraction of the nucleon's momentum was carried by the struck quark. Perturbative quantum chromodynamics predicts that the down quarks will carry all of the nucleon's polarization if they carry all of its momentum. A modern quark model, with hyperfine interactions, predicts that the down quark's polarization contribution will oppose the nucleon's net polarization. The planned measurements should discriminate between these contradictory predictions with a statistical precision of two standard deviations.

	== Publications==		== Publications==

Foretony: /* Research Summary */

2015-09-11T16:54:55Z

Research Summary

← Older revision		Revision as of 16:54, 11 September 2015
Line 90:		Line 90:

	A majority of my research has involved asymmetry measurements using polarized electrons. My Ph. D. thesis reported a measurement of the neutral weak magnetic form factor of the proton using parity violation at MIT bates <ref name="SAMPLE"> {{cite Measurement of the Proton's Neutral Weak Magnetic Form Factor, B. Mueller et. al. , Phys. Rev. Lett. 78, (1997), 3824}}</ref>.		A majority of my research has involved asymmetry measurements using polarized electrons. My Ph. D. thesis reported a measurement of the neutral weak magnetic form factor of the proton using parity violation at MIT bates <ref name="SAMPLE"> {{cite Measurement of the Proton's Neutral Weak Magnetic Form Factor, B. Mueller et. al. , Phys. Rev. Lett. 78, (1997), 3824}}</ref>.
	~~I performed double spin~~ asymmetry measurements to extract polarized structure functions at Jefferson Lab ~~during my postdoctoral work~~. As a faculty member I ~~have~~ continued polarized structure function measurements and I have branched out to include physics applications research at the Idaho Accelerator Center. The highlights of this work is described below.		My post graduate work focused on asymmetry measurements using polarized electrons and polarized nucleons to extract polarized structure functions at Jefferson Lab. As a faculty member at ISU, I continued polarized structure function measurements and I have branched out to include physics applications research at the Idaho Accelerator Center. The highlights of this work are described below.

	Even though measurements of polarized structure functions have been taking place for more than three decades with substantial improvements in target polarization and kinematic coverage, fundamental questions remain unanswered yet within reach. Earlier experiments demonstrated that the quarks are not the main contributers to the spin of a nucleon. Contributions from gluons and the angular momentum of a ~~nucleons~~ constituents have become the focus of investigation for more than a decade. The polarized structure function measurements I ~~performed thus far~~ have helped to further constrain the uncertainty in measurements of the gluon contribution. I plan to continue these measurements (E12-06-109) with the upgraded facility at Jefferson Lab as it has become clear that the statistical and systematic uncertainties in the analysis used to extract the gluon contributions will benefit from a data set taken with an apparatus that has a large kinematic coverage.		Even though measurements of polarized structure functions have been taking place for more than three decades, with substantial improvements in target polarization and kinematic coverage, fundamental questions remain unanswered yet within reach. Earlier experiments demonstrated that the quarks in a nucleon are not the main contributers to the spin of a nucleon. Contributions from gluons and the angular momentum of a nucleon's constituents have become the focus of investigation for more than a decade. The polarized structure function measurements I participated in have helped to further constrain the uncertainty in measurements of the gluon contribution. I plan to continue these measurements (E12-06-109) with the upgraded facility at Jefferson Lab as it has become clear that the statistical and systematic uncertainties in the analysis used to extract the gluon contributions will benefit from a data set taken with an apparatus that has a large kinematic coverage.

	My contribution to ~~the~~ polarized structure function research has been testing the concept of quark-hadron duality, in addition my work supporting fellow collaborators. Quark-hardron duality ~~considers the possibility~~ that the resonance region in inelastic electron scattering can have observables that, on average, are quantitatively similar to those produced in the non resonant scattering region. The polarized structure function , g_1, was such an observable that I measured in the resonant and non-resonant region to test the concept of quark-hadron duality. My published results on the test showed that g_1, when averaged in the resonance region, was consistent with the same average using deep inelastic structure function data when the four momentum transfer squared (Q^2) was larger than 1.7 GeV^2/c^2. It also appears that the onset of quark-hadron duality for polarized structure functions occurs at a higher Q^2 than if an analagous comparison were made using unpolarized structure functions.		My main contribution to polarized structure function research thus far has been testing the concept of quark-hadron duality, in addition my work supporting my fellow collaborators. Quark-hardron duality postulates that the resonance region in inelastic electron scattering can have observables that, on average, are quantitatively similar to those produced in the non resonant scattering region. The polarized structure function , g_1, was such an observable that I measured in the resonant and non-resonant region to test the concept of quark-hadron duality. My published results on the test showed that g_1, when averaged in the resonance region, was consistent with the same average using deep inelastic structure function data when the four momentum transfer squared (Q^2) was larger than 1.7 GeV^2/c^2. It also appears that the onset of quark-hadron duality for polarized structure functions occurs at a higher Q^2 than if an analagous comparison were made using unpolarized structure functions.

	<re> http://journals.aps.org/prd/abstract/10.1103/PhysRevD.69.014505</ref>		<re> http://journals.aps.org/prd/abstract/10.1103/PhysRevD.69.014505</ref>
Line 103:		Line 103:
	I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.		I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.

	My current efforts are focused on using JLab's upgraded Hall B to measure the fractional down quark polarization in the nucleon. ~~Semi~~-~~inclusive deep inelastic scattering~~ will ~~be used to detect~~		My current efforts are focused on using JLab's upgraded Hall B to measure the fractional down quark polarization in the nucleon. I will use the CLAS12 detector in Jefferson Lab's Hall B to measure the cross-section helicity differences for positive and negative pion production from a polarized proton and deuteron. This combination of measurements will allow an extraction of the down quark polarization as a function of how large a fraction of the nucleon's momentum was carried by the struck quark. Perturbative quantum chromodynamics predicts that the down quarks will carry all of the nucleon's polarization if they carry all of its momentum. A modern quark model, with hyperfine interactions, predicts that the down quark's polarization contribution will appose the nucleon's net polarization. The planned measurements should discriminate between these contradictory predictions with a statistical precision of two standard deviations.

	== Publications==		== Publications==

Foretony: /* Summary */

2015-09-10T22:38:06Z

Summary

← Older revision		Revision as of 22:38, 10 September 2015
Line 86:		Line 86:

	=Scholarship=		=Scholarship=
	==Summary==		==Research Summary==

Foretony: /* Summary */

2015-09-10T19:52:50Z

Summary

← Older revision		Revision as of 19:52, 10 September 2015
Line 90:		Line 90:

	A majority of my research has involved asymmetry measurements using polarized electrons. My Ph. D. thesis reported a measurement of the neutral weak magnetic form factor of the proton using parity violation at MIT bates <ref name="SAMPLE"> {{cite Measurement of the Proton's Neutral Weak Magnetic Form Factor, B. Mueller et. al. , Phys. Rev. Lett. 78, (1997), 3824}}</ref>.		A majority of my research has involved asymmetry measurements using polarized electrons. My Ph. D. thesis reported a measurement of the neutral weak magnetic form factor of the proton using parity violation at MIT bates <ref name="SAMPLE"> {{cite Measurement of the Proton's Neutral Weak Magnetic Form Factor, B. Mueller et. al. , Phys. Rev. Lett. 78, (1997), 3824}}</ref>.
	I performed double spin asymmetry measurements to extract polarized structure functions at Jefferson Lab during my postdoctoral work. Even though these measurements have been taking place for more than three decades and there have been improvements in target polarization and kinematic coverage, fundamental questions remain unanswered yet within reach. Earlier experiments demonstrated that the quarks are not the main contributers to the spin of a ~~nucleon. Contributions from gluons and the angular momentum of a nucleons constituents~~ have ~~become the focus of investigation for more than a decade. The~~ polarized structure function measurements I ~~performed during my postoctoral work has helped~~ to ~~further constrain the uncertainty in measurements of~~ the ~~gluon contribution~~. I plan to continue these measurements (E12-06-109) with the upgraded facility at Jefferson Lab as it has become clear that the statistical and systematic uncertainties in the analysis used to extract the gluon contributions will benefit from a data set taken with an apparatus that has a large kinematic coverage.		I performed double spin asymmetry measurements to extract polarized structure functions at Jefferson Lab during my postdoctoral work. As a faculty member I have continued polarized structure function measurements and I have branched out to include physics applications research at the Idaho Accelerator Center. The highlights of this work is described below.

	I ~~focused on~~ testing the concept of quark-hadron duality ~~for polarized structure functions~~, in addition my ~~collaborative efforts extracting the polarized structure function~~. Quark-hardron duality considers the possibility that the resonance region in inelastic electron scattering can ~~exhibit~~, on average, ~~observables that~~ are quantitatively similar to those produced in the non resonant scattering region. The polarized structure function , g_1, was ~~averaged from pion threshold~~ to the ~~conventional missing mass (W) value~~ of ~~2 GeV~~. ~~This~~ region ~~of "global" duality~~ was ~~found to be~~ consistent with the same average using deep inelastic structure function data when the four momentum transfer squared (Q^2) was larger than 1.7 GeV^2/c^2. ~~The~~ onset of ~~Quark~~-~~Hardron~~ duality for polarized structure functions occurs at a higher Q^2 than if an analagous comparison were made using unpolarized structure functions.		Even though measurements of polarized structure functions have been taking place for more than three decades with substantial improvements in target polarization and kinematic coverage, fundamental questions remain unanswered yet within reach. Earlier experiments demonstrated that the quarks are not the main contributers to the spin of a nucleon. Contributions from gluons and the angular momentum of a nucleons constituents have become the focus of investigation for more than a decade. The polarized structure function measurements I performed thus far have helped to further constrain the uncertainty in measurements of the gluon contribution. I plan to continue these measurements (E12-06-109) with the upgraded facility at Jefferson Lab as it has become clear that the statistical and systematic uncertainties in the analysis used to extract the gluon contributions will benefit from a data set taken with an apparatus that has a large kinematic coverage.

			My contribution to the polarized structure function research has been testing the concept of quark-hadron duality, in addition my work supporting fellow collaborators. Quark-hardron duality considers the possibility that the resonance region in inelastic electron scattering can have observables that, on average, are quantitatively similar to those produced in the non resonant scattering region. The polarized structure function , g_1, was such an observable that I measured in the resonant and non-resonant region to test the concept of quark-hadron duality. My published results on the test showed that g_1, when averaged in the resonance region, was consistent with the same average using deep inelastic structure function data when the four momentum transfer squared (Q^2) was larger than 1.7 GeV^2/c^2. It also appears that the onset of quark-hadron duality for polarized structure functions occurs at a higher Q^2 than if an analagous comparison were made using unpolarized structure functions.

	<re> http://journals.aps.org/prd/abstract/10.1103/PhysRevD.69.014505</ref>		<re> http://journals.aps.org/prd/abstract/10.1103/PhysRevD.69.014505</ref>

Foretony: /* Summary */

2015-09-10T18:56:21Z

Summary

← Older revision		Revision as of 18:56, 10 September 2015
Line 100:		Line 100:

	I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.		I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.

			My current efforts are focused on using JLab's upgraded Hall B to measure the fractional down quark polarization in the nucleon. Semi-inclusive deep inelastic scattering will be used to detect

	== Publications==		== Publications==

Foretony: /* Summary */

2015-09-10T18:52:48Z

Summary

← Older revision		Revision as of 18:52, 10 September 2015
Line 99:		Line 99:
	One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, I used the IAC to test detectors and measure radiation damage of detector materials. I then found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove model dependencies. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors.		One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, I used the IAC to test detectors and measure radiation damage of detector materials. I then found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove model dependencies. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors.

	I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. At least one positron was produced for every million electrons impinging the target.		I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. t least one positron was produced for every million electrons impinging the target. The work is documented in a Ph.D. thesis at ISU. The work also led to performing a similar measurement as part of the Polarized Electron Polarized Position (PEPPo) collaboration using the JLab injector during the accelerator upgrade. The PEPPo experiment's main goal was to determine the polarization transferred to the positron from the polarized electron. The results are in final preparation for release.

	~~During~~ the JLab accelerator upgrade~~, I~~
	~~Positrons~~

	~~PAA~~

	== Publications==		== Publications==

Foretony: /* Summary */

2015-09-10T16:12:11Z

Summary

← Older revision		Revision as of 16:12, 10 September 2015
Line 92:		Line 92:
	I performed double spin asymmetry measurements to extract polarized structure functions at Jefferson Lab during my postdoctoral work. Even though these measurements have been taking place for more than three decades and there have been improvements in target polarization and kinematic coverage, fundamental questions remain unanswered yet within reach. Earlier experiments demonstrated that the quarks are not the main contributers to the spin of a nucleon. Contributions from gluons and the angular momentum of a nucleons constituents have become the focus of investigation for more than a decade. The polarized structure function measurements I performed during my postoctoral work has helped to further constrain the uncertainty in measurements of the gluon contribution. I plan to continue these measurements (E12-06-109) with the upgraded facility at Jefferson Lab as it has become clear that the statistical and systematic uncertainties in the analysis used to extract the gluon contributions will benefit from a data set taken with an apparatus that has a large kinematic coverage.		I performed double spin asymmetry measurements to extract polarized structure functions at Jefferson Lab during my postdoctoral work. Even though these measurements have been taking place for more than three decades and there have been improvements in target polarization and kinematic coverage, fundamental questions remain unanswered yet within reach. Earlier experiments demonstrated that the quarks are not the main contributers to the spin of a nucleon. Contributions from gluons and the angular momentum of a nucleons constituents have become the focus of investigation for more than a decade. The polarized structure function measurements I performed during my postoctoral work has helped to further constrain the uncertainty in measurements of the gluon contribution. I plan to continue these measurements (E12-06-109) with the upgraded facility at Jefferson Lab as it has become clear that the statistical and systematic uncertainties in the analysis used to extract the gluon contributions will benefit from a data set taken with an apparatus that has a large kinematic coverage.

	I focused on testing the concept of quark-hadron duality for polarized structure functions, in addition my collaborative efforts extracting the polarized structure function. Quark-hardron duality considers the possibility that the resonance region in inelastic electron scattering can exhibit, on average, observables that are quantitatively similar to those produced in the non resonant scattering region. The polarized structure function , g_1, was averaged from pion threshold to the conventional missing mass (W) value of 2 GeV. This region of "global" duality was found to be ~~consistend~~ with the same average using deep inelastic structure function data when the four momentum transfer ~~quared~~ (Q^2) was larger than 1.7 GeV^2/c^2. The onset of Quark-Hardron duality for polarized structure functions occurs at a higher Q^2 than if an analagous comparison were made using unpolarized ~~sstructure function~~.		I focused on testing the concept of quark-hadron duality for polarized structure functions, in addition my collaborative efforts extracting the polarized structure function. Quark-hardron duality considers the possibility that the resonance region in inelastic electron scattering can exhibit, on average, observables that are quantitatively similar to those produced in the non resonant scattering region. The polarized structure function , g_1, was averaged from pion threshold to the conventional missing mass (W) value of 2 GeV. This region of "global" duality was found to be consistent with the same average using deep inelastic structure function data when the four momentum transfer squared (Q^2) was larger than 1.7 GeV^2/c^2. The onset of Quark-Hardron duality for polarized structure functions occurs at a higher Q^2 than if an analagous comparison were made using unpolarized structure functions.

	<re> http://journals.aps.org/prd/abstract/10.1103/PhysRevD.69.014505</ref>		<re> http://journals.aps.org/prd/abstract/10.1103/PhysRevD.69.014505</ref>


	One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, the IAC ~~was used~~ to test detectors and measure radiation damage of detector materials. ~~Later,~~ I found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove ~~many~~ model dependencies ~~if not be a fundamental test~~. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors. ~~I receved an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by an 10 MeV incident electron beam.~~		One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, I used the IAC to test detectors and measure radiation damage of detector materials. I then found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove model dependencies. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors.

			I received an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by a 10 MeV incident electron beam. An achromatic beam line was designed, constructed, and instrumented to collect positrons emmitted by the downstream side of the tungsten target using a quard triplet. At least one positron was produced for every million electrons impinging the target.
	~~Fortuitously,~~ the ~~positron production efficienty~~ of ~~using~~ the 10 MeV ~~energy~~ of ~~electrons at JLab's injector~~ was ~~available~~ for ~~use during~~ the ~~shutdown period being used to upgrade JLab's accelerator energy~~.

	During the JLab accelerator upgrade, I		During the JLab accelerator upgrade, I

Foretony: /* Summary */

2015-09-10T15:51:27Z

Summary

← Older revision		Revision as of 15:51, 10 September 2015
Line 97:		Line 97:


	One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, the IAC was used to test detectors and measure radiation damage of detector materials. Later, I found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove many model dependencies if not be a fundamental test. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors. Fortuitously, the positron production efficienty of using the 10 MeV energy of electrons at JLab's injector was available for use during the shutdown period being used to upgrade JLab's accelerator energy.		One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, the IAC was used to test detectors and measure radiation damage of detector materials. Later, I found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove many model dependencies if not be a fundamental test. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors. I receved an award to measure the efficiency of producing positrons in a Tungsten target from the bremmstrahlung photons produced by an 10 MeV incident electron beam.


			Fortuitously, the positron production efficienty of using the 10 MeV energy of electrons at JLab's injector was available for use during the shutdown period being used to upgrade JLab's accelerator energy.

	During the JLab accelerator upgrade, I		During the JLab accelerator upgrade, I

Foretony: /* Summary */

2015-09-09T16:56:55Z

Summary

← Older revision		Revision as of 16:56, 9 September 2015
Line 97:		Line 97:


	One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, the IAC was used to test detectors or measure radiation damage of detector materials. I found an opportunity to develop a positron source at the IAC that had the potential to ~~be in~~ a program of charge symmetry based experiments at Jefferson Lab. Fortuitously, the positron production efficienty of using the 10 MeV energy of electrons at JLab's injector was available for use during the shutdown period being used to upgrade JLab's accelerator energy.		One of the main reasons I came to ISU was the availability of a local electron accellerator facility at the Idaho Accelerator Center. At first, the IAC was used to test detectors and measure radiation damage of detector materials. Later, I found an opportunity to develop a positron source at the IAC that had the potential to advance a program of charge symmetry based experiments at Jefferson Lab. Experiments using both positrons and electrons have the potential to remove many model dependencies if not be a fundamental test. For example, a measurement of polarized electron and proton scattering from a polarized nucleon target has the potential to be a model independent measurement of a nucleon's electromagnetic form factors. Such a measurement has the potential to reconcile the current discrepancy between cross-section based and polarization transfer based measurements of these form factors. Fortuitously, the positron production efficienty of using the 10 MeV energy of electrons at JLab's injector was available for use during the shutdown period being used to upgrade JLab's accelerator energy.

	During the JLab accelerator upgrade, I		During the JLab accelerator upgrade, I