Subject: Crude FPP performance estimate P (MeV/c) thickness efficiency(5-20 deg) (5-20 deg) ------------------------------------------------------------- 800 3" 5 % 0.48 ------------------------------------------------------------- 700 3" 6 % 0.53 ------------------------------------------------------------- 650 3" 5 % 0.48 ------------------------------------------------------------- 600 3" 4 % 0.38 600 1.5" 3 % 0.44 ------------------------------------------------------------- 550 1.5" 2.3 % 0.32 ------------------------------------------------------------- 500 1.5" 2.1 % 0.22 500 1 cm 0.7 % 0.29 ------------------------------------------------------------- 450 1.5" 2 % 0.12 450 1 cm 0.6 % 0.20 Notes: 1) Yes, Ed, Mark, I know I should give , but it actually is an rms average, so it is okay. If I understand my code! 2) This estimate neglects that the protons lose energy in the target, windows, S1, ... so we might want to step from 3" to 1.5" by 600 MeV/c, and then step to S2 only somewhere between 450 and 500 MeV/c. 3) These estimates are from the earlier analyzing power calibrations and some less reliable cross section measurements. Consider them to have moderately large uncertainties. rg