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)

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

An initial set of positron production efficiency measurements were performed


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


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.


HRRL beamline for positron generation.	A picture of the HRRL positron beam line.

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


A picture of the rotating target motor with cooling lines.


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.