Difference between revisions of "JLAB Positron Source DOE Award DE-SC0002600"

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=====HRRL emittance measurements=====
 
=====HRRL emittance measurements=====
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{|  border="0" style="background:transparent;"  align="center"
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|-
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|  [[image: HRRL_Mar_Emit_par_fit_1.png| 200 px |thumb|Fig. Square of rms values and parabolic fittings. .]]
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|| [[image: HRRL_Mar_Emit_par_fit_2.jpg| 200 px |thumb|Fig. Square of rms values and parabolic fittings. .]]
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{|border="2" colspan = "20"
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|  Parameter || Unit  ||  Value  ||
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|-
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|  projected emittance <math>\epsilon_x</math>  ||  <math>\mu</math>m  ||    0.37 <math>\pm</math> 0.02  ||
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|-
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|  projected emittance <math>\epsilon_y</math>  ||  <math>\mu</math>m  ||  0.30 <math>\pm</math> 0.04    ||
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|-
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|  <math>\beta_x</math>-function  ||  m  ||  1.40  <math>\pm</math>  0.06    ||
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|-
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|  <math>\beta_y</math>-function  ||  m  ||  1.17  <math>\pm</math> 0.13  ||
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|-       
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|  <math>\alpha_x</math>-function  ||  rad  ||  0.97  <math>\pm</math>  0.06  ||
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|-       
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|  <math>\alpha_y</math>-function ||  rad  ||    0.24  <math>\pm</math> 0.07  ||
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|-       
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|  micro-pulse charge || pC  ||    11  ||
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|-       
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|  micro-pulse length ||  ps  ||  35  ||
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|-
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|  energy of the beam  ''E''  || MeV ||    15      <math>\pm</math>  1.6  ||
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|-       
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|  relative energy spread  <math>\Delta E/E</math>  ||  %  ||  10.4    ||
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|- 
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|}
  
 
==== Positron converter target====
 
==== Positron converter target====

Revision as of 22:52, 22 July 2013

Award Info

8/15/09 - 8/14/2012

Funds Obligated: $381,509

Funds Requested: $411,509

Sponsored Project Proposal Number : 8-17

DOE Award Number : DE-SC0002600

Accounts set up on 10/14/09

Banner Index : RACL39 Account Numer : 684-143-40

Fund: X10165, Org code: 640000, Program : 040R0

Final Report

DOE Award #: DE-SC0002600

Project Title: The Development of a Positron Source for JLab at the IAC

Date: 8/1/13

Period covered: 8/15/09-8/14/2013 (Final Report)

Accomplishments

The performance of positron source using a quad triplet collection system has been measured using the support from this award.

Initial Positron production measurement

An initial set of positron production efficiency measurements were performed


Chips run-2008 setup.png CHIPS 5-08 8FC.jpg
The beam line used for an initial set of positron production measurements A picture of the HgPe detector entrance and Farraday cup.


Item Description
Tantalum Foil 6 mm thick 20 mm x 20 mm area
Tungsten Foil 2 mm thick 20 mm x 20 mm area
Phosphorus Flag 1 mil aluminum backing
Media:HpGe_Crystal_GEM-60195-Plus-P.pdf 81.3mm Diameter, 55.5mm Length
NaI detector
Run60 HpGe-NaI.gif PositronYield SweeperMagnet run60-61.gif
The observed photon energy distributions as measured by the HpGe (top) and NaI (bottom) detectors. There was no coincidence requirement using the two detectors. The HpGe photon energy distribution before and after a sweep magnet is used to deflect charged particles away from the conversion target.

2nd Generation positron source

Beamline Optimization

BeamLine Yim 10-14-10.png Positron Source HRRL beamline images 2.jpg
HRRL beamline for positron generation. A picture of the HRRL positron beam line.
HRRL emittance measurements
Fig. Square of rms values and parabolic fittings. .
Fig. Square of rms values and parabolic fittings. .
Parameter Unit Value
projected emittance [math]\epsilon_x[/math] [math]\mu[/math]m 0.37 [math]\pm[/math] 0.02
projected emittance [math]\epsilon_y[/math] [math]\mu[/math]m 0.30 [math]\pm[/math] 0.04
[math]\beta_x[/math]-function m 1.40 [math]\pm[/math] 0.06
[math]\beta_y[/math]-function m 1.17 [math]\pm[/math] 0.13
[math]\alpha_x[/math]-function rad 0.97 [math]\pm[/math] 0.06
[math]\alpha_y[/math]-function rad 0.24 [math]\pm[/math] 0.07
micro-pulse charge pC 11
micro-pulse length ps 35
energy of the beam E MeV 15 [math]\pm[/math] 1.6
relative energy spread [math]\Delta E/E[/math] % 10.4

Positron converter target

HRRL Beam Rot Tar Sys Mot16.png
A picture of the rotating target motor with cooling lines.

Positron Production Performance

SAINT-GOBAIN 3M33.png IAC NaI Detectors and Parts 7.png Hrrl pos det calb det3 r2637 r2636.png
A drawing fo the NaI detectors used to measure 511 keV photons from the annihlation of positrons by T2. A picture of detectors along with modified bases. A calibrated energy distribution using a Co-60 and Na-22 button source.


HRRL Jul2012 pos to ele ratio 1.png

Things not accomplished

No Positron workshop but rather a PePPO collaboration meeting

Used OTR to measure emmittance.

Positron current was too low for a FC measurement

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