Exploring gold at KE50MeV X Roca Maza Target Thickness Effective Sherman Function Target thickness dependence of elastically scattered e Precise singleatom Sherman function theoretical calculations ID: 816089
Download The PPT/PDF document "Mott Polarimeter at CEBAF" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Mott
Polarimeter at CEBAF
Slide2Exploring
gold at KE=5.0MeV
X. Roca-
Maza
Slide3Target Thickness
Effective Sherman Function
Target thickness dependence
of elastically scattered e-
Precise single-atom Sherman function (theoretical calculations)
Measure asymmetry with small instrumental uncertainty (beam systematics)
AccurateTest
of MeV
Mott
(
D
P/P)
Expected Range of Uncertainty
Theory
0.5
– 1
.0%
Target
Thickness
0.2
– 0.
5%
Instrumental
0.2 – 0.3%
BUDGET
0.6
– 1
.2%
Slide4January 2015 - Run 1Used our apparatus design energy of KE=5.0 MeV
Systematics of asymmetry vs …Beam positionBeam sizeBeam energy spreadDump backgroundDAQ dead timeDetector rateTarget thickness extrapolation of11 foils from 0.05 to 1 micron thickPrecision statistics (1-3 hours for 0.25%)
Slide5FESEM of “0.75 micron” gold target
Slide6Slide7Precision Test of Mott
Polarimetryin the MeV Energy RangeP.A. Adderley1, T. Gay2, J. Grames1, J. Hansknecht1,C. Horowitz3, A. Mamun4, M.J.
McHugh5, A.K. Opper
5,M
. Poelker
1
, X
. Roca-
Maza
6
,
C.
Sinclair
7
,
M. Stutzman
1
,
R
.
Suleiman
1
1
Jefferson
Lab
2
University
of
Nebraska
3
Indiana University
4
Old Dominion University
5The
George Washington University6
University of Milan
7Cornell University