Transcript Document 7472334

PS BOOSTER
M. Chanel
PPC : 3 décembre 1999
OPERATION
•Lead Ions ok but not top perf. due to vacuum not as
good as last year.
•AD beam ok but still pb synchro: should be solved
next year together with diagnostics.
MD ON PSB
• HOLLOW BEAM: Applied to:
– LHC type beams,4 PSB rings, no improvement for the
nominal LHC beam.
– Firsts tries for TOF beam, seems to give less losses in
PS.
– Some pb to maintain bunch flatness for long time: to be
understood.
– à suivre.
• LHC : initial beam needed:exit PS:0.8mm,1.4 1012
2 batches; PSB:1.75 1011/ring)
– Achieved in PS 1 batch,1 1012, (eh+ev)/2 <0.6mm after
filamentation on injection flat bottom.
MD PSB (suite)
• Tries to compensate Qv=5(integer resonance)
– excited by dipoles(Qv=5), quads(2 Qv=10), Skew
sext(3 Qv=15)...
– dipole, quad compensations on ring 2.
– switch off XSk’s(3 Qv=16)
– double traversal(coherent) see pict.
– With Qv=5.26, high space charge 5 to10% more
beam(see pict.)