Niowave 2-2016 - Revision history

Foretony at 15:33, 13 April 2016

2016-04-13T15:33:07Z

Foretony at 15:31, 13 April 2016

2016-04-13T15:31:43Z

Foretony: /* Positrons exiting the Solenoid */

2016-04-13T15:27:51Z

Positrons exiting the Solenoid

Foretony at 15:27, 13 April 2016

2016-04-13T15:27:25Z

Foretony at 15:24, 13 April 2016

2016-04-13T15:24:59Z

Foretony at 20:59, 12 April 2016

2016-04-12T20:59:49Z

Foretony at 20:58, 12 April 2016

2016-04-12T20:58:01Z

Foretony: Created page with "The energy deposited by electrons scattered into a 3.48 diameter stainless steel beam pipe (1.65 mm thick) from a PbBi target as a function of a uniform Solenoidal magnetic fiel…"

2016-04-12T20:45:56Z

Created page with "The energy deposited by electrons scattered into a 3.48 diameter stainless steel beam pipe (1.65 mm thick) from a PbBi target as a function of a uniform Solenoidal magnetic fiel…"

New page

The energy deposited by electrons scattered into a 3.48 diameter stainless steel beam pipe (1.65 mm thick) from a PbBi target as a function of a uniform Solenoidal magnetic field.

{| border="1"
{| border="1"
| B-field (Tesla) || Hot Spot (<math>MeV/e^-</math>)
|-
| 0.0 || 0.35
|-
| 0.3 || 0.35
|-
| 1.0 || 0.35
|-
| 1.5 || 0.22
|-
| 2.0 || 0.10
|-
| 4.0 || 0.002
|+
|}

To convert this deposited energy per incident electron on the target to a heat load in the pipe you need to divide by the area of the pipe.

A histogram is filled with 1 cm bins along the Z axis. The surface area becomes <math>1 cm \times 2 \pi 3.48/2 = 10.933 cm^2</math>. The beam pipe diameter assumed is 3.48 cm.

When filling the histogram binned 1 cm in Z, you should weight it by the amount of depositred energy divided by the circumference of the pipe and divided by the number of incident electrons on the target (5 million). The energy units are converted to keV by multiplying the numberator by 100 or in this case dividing by 5000 instead of 5 million.

TH1F *T00N=new TH1F("T00N","T00N",100,-1000.5,-0.5)

Electrons->Draw("evt.EoutPosZ>>T00N","evt.DepE/10.088/5000")

To convert From Mev/ e- to kW/cm^2 assuming a current of 1mA (10^-3 C/s) you

<math>\left( \frac{\mbox{MeV}}{\mbox{cm}^2 \mbox{e}^-}\right) \times \left( \frac{ \mbox{e}^-}{1.6 \times 10^{-19}\mbox{C}} \right ) \times \left( \frac{1 \times 10^{-3} \mbox{C}}{\mbox{s}} \right ) \times \left( \frac{1.6 \times 10^{-13}\mbox{W} \cdot \mbox{ s}}{\mbox{MeV} }\right )</math>

<math>\left( \frac{\mbox{keV}}{\mbox{cm}^2 \mbox{e}^-}\right) = \left( \frac{\mbox{W} }{\mbox{cm}^2 } \right )</math>

{| border="1"
| [[File:BeamPipeDepEmev-vs-B.png |200px]] || [[File:BeamPipeDepPower-vs-B.png |200px]]|| [[File:BeamPipeDepPower-vs-lowB.png |200px]]
|+ Energy deposited (MeV) along a 1 m long beam pipe of stainless steel 1.65 mm thick.
|}

With SS windows
Positrons->Draw("sqrt(evt.BeamPosPosX*evt.BeamPosPosX+evt.BeamPosPosY*evt.BeamPosPosY)","evt.BeamPosMomZ>0 && evt.BeamPosPosZ>-500 && sqrt(evt.BeamPosPosX*evt.BeamPosPosX+evt.BeamPosPosY*evt.BeamPosPosY)<97.4/2");

@@ Line 4: / Line 4: @@
 Event files were generated for Niowave's beam line designers assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm.  Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm.  Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm.  The incident electron beam is a 0.5 cm radius cylinder.
-Below is a table illustrating the target and stainless steel window geometry as well as a rare event where positrons were produced in the stainless steel window instead of the PbBi target.  The solenoid design uses a maximum uniform field of 0.20 Tesla and a length of 150 mm.
+Below is a table illustrating the target and stainless steel window geometry as well as a rare event where positrons were produced in the stainless steel window instead of the PbBi target.  The solenoid design uses a maximum uniform field of 0.20 Tesla and a length of 150 mm.  Twenty (20) million incident electrons with an energy of 10 MeV and forming a cylindrical beam with a 0.5 cm radius cylinder impinged a 2mm thick LBE target located at Z = -106 mm.  The Z location of positrons exiting the beam pipe at the end of the 15 cm long solenoid is 44 mm.  The positrons are 150.00 mm from the middle of the LBE target (Z=44mm).  A space delimited text file with the above events in the format of
@@ Line 16: / Line 21: @@
 |+ Apparatus
 |}

@@ Line 4: / Line 4: @@
 Event files were generated for Niowave's beam line designers assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm.  Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm.  Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm.  The incident electron beam is a 0.5 cm radius cylinder.
-===Positrons exiting the Solenoid===
+Below is a table illustrating the target and stainless steel window geometry as well as a rare event where positrons were produced in the stainless steel window instead of the PbBi target.  The solenoid design uses a maximum uniform field of 0.20 Tesla and a length of 150 mm.
@@ Line 12: / Line 10: @@
 {| border="1"
-| [[File:TF_Niowave_SolenoidDesign_12-04-15.png | 200 px]] || [[File:TF_LBEtarg1_1-12-16.png | 200 px]]|| [[File:TF_LBEposEvent_1-12-16.png | 200 px]]
+| [[File:TF_LBEtarg1_1-12-16.png | 200 px]]|| [[File:TF_LBEposEvent_1-12-16.png | 200 px]]
 |-
-| Overall Target layout || Closeup of Target Simulation Geometry. The center of the 0.25mm thick stainless steel windows are a distance of 2.25 mm from the center of the LBE target.  <math>d_{USS} =  d_{DSS} =</math> 2.25 mm, <math>t_{LBE}=2</math> mm, <math>t_{SS} =</math> .25 mm. ||  An example positron production event.  The yellow lines represents a sensitive detector used to record positron events.  The red line represents the incident 10 MeV electron that produces two bremsstrahlung photons shown in green.  The first photon has an energy of 2.151 MeV and pair produces in the stainless steel window.  The second photon has an energy of 1.393 MeV and exits the system without interacting.  The first photon is created at time t= 3.323 ns. The first photon produces a  234.6 keV electron and a 894.2 keV positron at time t=3.336 ns.  Only the positron has enough energy to exit the stainless steel window.
+| Closeup of Target Simulation Geometry. The center of the 0.25mm thick stainless steel windows are a distance of 2.25 mm from the center of the LBE target.  <math>d_{USS} =  d_{DSS} =</math> 2.25 mm, <math>t_{LBE}=2</math> mm, <math>t_{SS} =</math> .25 mm. ||  An example positron production event.  The yellow lines represents a sensitive detector used to record positron events.  The red line represents the incident 10 MeV electron that produces two bremsstrahlung photons shown in green.  The first photon has an energy of 2.151 MeV and pair produces in the stainless steel window.  The second photon has an energy of 1.393 MeV and exits the system without interacting.  The first photon is created at time t= 3.323 ns. The first photon produces a  234.6 keV electron and a 894.2 keV positron at time t=3.336 ns.  Only the positron has enough energy to exit the stainless steel window.
 |+ Apparatus
 |}

@@ Line 15: / Line 15: @@
 |-
-| Overall Target layout || Closeup of Target Simulation Geometry. The center of the 0.25mm thick stainless steel windows are a distance of 2.25 mm from the center of the LBE target.  <math>d_{USS} =  d_{DSS} =</math> 2.25 mm, <math>t_{LBE}=2</math> mm, <math>t_{SS} =</math> .25 mm. ||  An example positron production event.  The yellow lines represents a sensitive detector used to record all positron events.  The red line represents the incident 10 MeV electron that produces two bremsstrahlung photons shown in green.  The first photon has an energy of 2.151 MeV and pair produces in the stainless steel window.  The second photon has an energy of 1.393 MeV and exits the system without interacting.  The first photon is created at time t= 3.323 ns. The first photon produces a  234.6 keV electron and a 894.2 keV positron at time t=3.336 ns.  Only the positron has enough energy to exit the stainless steel window.
+| Overall Target layout || Closeup of Target Simulation Geometry. The center of the 0.25mm thick stainless steel windows are a distance of 2.25 mm from the center of the LBE target.  <math>d_{USS} =  d_{DSS} =</math> 2.25 mm, <math>t_{LBE}=2</math> mm, <math>t_{SS} =</math> .25 mm. ||  An example positron production event.  The yellow lines represents a sensitive detector used to record positron events.  The red line represents the incident 10 MeV electron that produces two bremsstrahlung photons shown in green.  The first photon has an energy of 2.151 MeV and pair produces in the stainless steel window.  The second photon has an energy of 1.393 MeV and exits the system without interacting.  The first photon is created at time t= 3.323 ns. The first photon produces a  234.6 keV electron and a 894.2 keV positron at time t=3.336 ns.  Only the positron has enough energy to exit the stainless steel window.
 |+ Apparatus
 |}
@@ Line 66: / Line 66: @@
 |+ Positron Distributions
 |}
 ===Positrons and Electrons after the SS Exit window===

← Older revision		Revision as of 15:27, 13 April 2016
Line 2:		Line 2:


−	Event files were generated assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm. Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm. Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm. The incident electron beam is a 0.5 cm radius cylinder.	+	Event files were generated for Niowave's beam line designers assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm. Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm. Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm. The incident electron beam is a 0.5 cm radius cylinder.

	===Positrons exiting the Solenoid===		===Positrons exiting the Solenoid===

← Older revision		Revision as of 15:24, 13 April 2016
Line 1:		Line 1:
		+	Niowave Positron Project Progress for February 2016
		+
		+
	Event files were generated assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm. Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm. Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm. The incident electron beam is a 0.5 cm radius cylinder.		Event files were generated assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm. Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm. Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm. The incident electron beam is a 0.5 cm radius cylinder.

@@ Line 1: / Line 1: @@
-Event files were generated assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm.  Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm.  Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -10.4875 and Z= -10.7125 cm. The target is located at Z = -10.6 cm and the beam begins upstream at Z =  -1.1 m.  The incident electron beam is a 0.5 cm radius cylinder.
+Event files were generated assuming an ideal solenoid having an inner radius of 2.527 cm surrounding a beam pipe with a radius of 1.74 cm.  Electrons impinge a 2mm thick PbBi liquid target that has a surface area of 2.54 cm x 2.54 cm.  Stainless steel windows 0.25 mm thick sandwhich the PbBi target at locations Z= -90.325 and Z= -89.875 cm. The target is located at Z =-90.1 cm and the beam begins 20 cm upstream at Z = -110.1 cm.  The incident electron beam is a 0.5 cm radius cylinder.
 ===Positrons exiting the Solenoid===
@@ Line 12: / Line 12: @@
 |-
-| Overall Target layout || Closeup of Target Simulation Geometry. The center of the 0.25mm thick stainless steel windows are a distance of 1.125 mm from the center of the LBE target.  <math>d_{USS} =  d_{DSS} =</math> 1.125 mm, <math>t_{LBE}=2</math> mm, <math>t_{SS} =</math> .25 mm. ||  An example positron production event.  The yellow lines represents a sensitive detector used to record all positron events.  The red line represents the incident 10 MeV electron that produces two bremsstrahlung photons shown in green.  The first photon has an energy of 2.151 MeV and pair produces in the stainless steel window.  The second photon has an energy of 1.393 MeV and exits the system without interacting.  The first photon is created at time t= 3.323 ns. The first photon produces a  234.6 keV electron and a 894.2 keV positron at time t=3.336 ns.  Only the positron has enough energy to exit the stainless steel window.
+| Overall Target layout || Closeup of Target Simulation Geometry. The center of the 0.25mm thick stainless steel windows are a distance of 2.25 mm from the center of the LBE target.  <math>d_{USS} =  d_{DSS} =</math> 2.25 mm, <math>t_{LBE}=2</math> mm, <math>t_{SS} =</math> .25 mm. ||  An example positron production event.  The yellow lines represents a sensitive detector used to record all positron events.  The red line represents the incident 10 MeV electron that produces two bremsstrahlung photons shown in green.  The first photon has an energy of 2.151 MeV and pair produces in the stainless steel window.  The second photon has an energy of 1.393 MeV and exits the system without interacting.  The first photon is created at time t= 3.323 ns. The first photon produces a  234.6 keV electron and a 894.2 keV positron at time t=3.336 ns.  Only the positron has enough energy to exit the stainless steel window.
 |+ Apparatus
 |}
-Event files for positrons and electrons are created at two positions, the exit of the downstream SS windows and the exit of the solenoid.
+In other words I should generate position and momentum files for positrons and electrons at the Z location 15 cm downstream from the middle of the LBE target and within a 3.48 cm diameter beam pipe.
@@ Line 26: / Line 34: @@
 PID, x(mm),y,z,Px,Py,Pz(MeV),t(ns)
-in units of mm for distance and MeV for momentum is located at
+in units of cm for distance and MeV for momentum is located at
-http://www2.cose.isu.edu/~foretony/PosAtExitWindowNoGaps6MeV.dat
+http://www2.cose.isu.edu/~foretony/Positrons_2mm10MeVCyl.dat
 and
-http://www2.cose.isu.edu/~foretony/ElectronsAtExitWindowNoGaps6MeV.dat
+http://www2.cose.isu.edu/~foretony/Electrons_2mm10MeVCyl.dat
-for electrons.
+A space delimited text file with the above events in the format of
-==Sample Events==
+Initial electron (x,y,z,Px,Py,Pz), Final electron (t,x,y,z,Px,Py,Pz), Positron location after leaving LBE target (t,x,y,z,Px,Py,Pz),Location of positron as it exits a SS window (t,x,y,z,Px,Py,Pz).  Units are ns, mm, MeV/c.
-The Sensitive detector is located either 1.1 mm (Z=-103.775 mm) away from the last SS window or 15 cm (Z= 46.225 mm )downstream.
+http://www2.cose.isu.edu/~foretony/AllPositrons_2mm10MeVCyl.dat
 {| border="1"
-| particle|| Energy || At SS Exit Z= -10.3775 cm|| At Solenoid Exit
+| [[File:PositronTime_1-10-16.png|200px]]  ||
 |-
-| Positrons || 6 MeV  ||  http://www2.cose.isu.edu/~foretony/PosAtExitWindowNoGaps6MeV.dat || http://www2.cose.isu.edu/~foretony/PosExitSolenoidNoGaps6MeV.dat
+|  Particle flight times for 20 million incident electrons on a 0.2mm thick LBE target with 0.25 mm thick stainless steel windows (no material exists after the last stainless steel window, only vacuum). The time an electron brems in the target (EscatTime) is shown in black.  The time a positron is created in the target (PosTime) is shown in blue.  The time a positron has traveled 15 cm traversing a uniform 0.2 Tesla Solenoidal field (PosBeamTime) is shown in fuchsia.  The field exists throughout the entire world.  PosBeamTimeCuts are positrons that are constrained to a beam pipe diameter of 34.8 mm.  Positrons are traveling about the speed of light (30 cm/ns) so after 15 cm they arrived 0.5 nsec after the initial electron beam impinges the target.
-|-
+|+ Positron Distributions
 |}