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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

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methodology
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
  • Using gaussian approximation to “Han” time distribution (see next slide)
    • I(t) = A*sin2.5(wt)*exp(-B/sin(wt)); B=5
    • ~ A*exp(-.5*t2/s2)
  • Using apertures from R. Andrew’s drawings
  • Using ABCI to calculate collimator wakefield
transverse wakefield from collimator from abci
Transverse Wakefield from Collimator (from ABCI)

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

beam alignment criteria at the collimator
Beam Alignment Criteria at the Collimator

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