Optical Properties of Spectrometer A, B, and C

See this Java Applet for interactive raytracing of the magnet optics.

Optics Spec. A Optics Spec. B

  units A B C
Configuration QSDD D QSDD
dispersive plane point-point point-point point-point
non dispersive plane parallel-point point-point parallel-point
Maximum momentum [MeV/c] 735 870 551
Reference momentum [MeV/c] 630 810 459
Central momentum [MeV/c] 665 810 490
Solid angle [msr] 28 5.6 28
Scattering Angle
minimum angle 18° 7° 18°
maximum angle 160° 62° 160°
Momentum acceptance 20% 15% 25%
Angular acceptance
dispersive [mrad] 70 70 70
nondispersive [mrad] 100 20 100
Long target acceptance [mm] 50 50 50
angle of focal plane 45° 47° 45°
length of focal plane [m] 1.80 1.80 1.60
length of central trajectory [m] 10.75 12.03 8.53
Dispersion (central) [cm/%] 5.77 8.22 4.52
Magnification (central) 0.53 0.85 0.51
Dispersion/Magnification [cm/%] 10.83 9.64 8.81
momentum resolution 10-4 10-4 10-4
angular resolution at target [mrad] <3 <3 <3
position resolution at target [mm] 3-5 1 3-5