Methodology. Tracking to downstream end of CC-1 with ASTRA Using PI parameters (possibly) suited for 3.2nC/bunch and bunch compression Egun @ 40MV/m, -12 °; CC-1 @ 60MV/m -15° (wrt max. acceleration) Dark current originating uniformly on 16mm dia. Mo cathode plug
RF phase (deg)
gaussian bunch, sz = 1.8mm
1.0 cm dia: peak wake = 750 V/pC/m
1.2 cm dia: peak wake = 520 V/pC/m
1.4 cm dia: peak wake = 370 V/pC/m
1.6 cm dia: peak wake = 270 V/pC/m
1.8 cm dia: peak wake = 200 V/pc/m
2.0 cm dia: peak wake = 160 V/pC/m
Limit transverse jitter of downstream beam to < .1sy Dqcoll<20mrad.
Using average wake field ~ ½ peak wake field; 3.2 nC; Pbeam=4.7 MeV/c
2 cm dia. collimator: Dyjitter < 380 mm
1 cm dia. collimator: Dyjitter < 80 mm
Limit emittance blowup downstream beam to < 10%.
De/e = 2*Ds/s < Dx/s Dqcoll less stringent than previous criterion