1. Mott Polarimeter Solid Angle
March 15, 2017

2. Large
Ring
Small
Ring
Flat
Plate

3. Design
Survey
Survey-Design
 Survey
LOCATION X Y Z in um
TOP BAFFLE HOLE
0.000
1.425
0.002
1.434
50.800
BEAM RIGHT BAFFLE HOLE
-1.425
-1.428
-0.002
BOTTOM BAFFLE HOLE
0.005
-1.436
BEAM LEFT BAFFLE HOLE
1.439
0.001
25.400
CENTER BAFFLE HOLE
0.004
-0.003
Average
-0.001

4. “Z” Upstream Foil = 10.929” + 0.157” = 11.086”
Aperture…
“Z” Upstream Foil = ” ” = ”
“X” Away from CL = 1.425”
Diameter (f) on Scattering Angle = 0.192”
Solid Angle : Orthogonal Square Cap
q = tan-1(X/Z) = deg
dq = tan-1(f/R) = rad = deg
dj = f/(R*sinq) = rad = 7.75 deg
dW = sinq dq dj = msr
Solid Angle : Circular Cap
dS = p (0.192”/2)2 = sq.in.
A = 4p (11.086” ”2) = 1570 sq.in.
dW = 4p dS/A = 4p (1.85 x 10-5) = msr
Steigerwald’s SPIN2000 quotes dW = 0.18 msr and q = deg.