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CLIC Beam Physics Meeting
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Europe/Zurich
6/2-004 (CERN)
Description
Some comments on phase stability, Current jitter measurements in CTF3, Kickers for the DB phase feedforward, Longitudinal tolerances in the MB RTML
Participants: B. Dalena, R. Corsini, A. Dubrovskiy, A. Hofmann, B. Jeanneret, M. Jonker, Ö. Mete, G. Morpurgo, Y. Papaphilippou, J. Pfingstner, L. Rinolfi, D. Schulte, G. Sterbini, F. Stulle, A. Vivoli
Y.P. reported on his visit to Cornell. The future program of CESR-TA has been discussed. There seem to be several opportunities to perform CLIC related studies.
D.S. discussed beam phase tolerances and the implications on beam line design of MB and DB. For the DB the general layout has been defined. For the MB the current layout results in rather tight RF tolerances, but it will only be change if these requirements cannot be met. There are ideas existing how to mitigate, but they have other disadvantages.
G.S. showed results on current stability measurements at CTF3. The first 13 BPMs have been used to measure the current profiles of the pulses. A pulse to pulse jitter of a 2e-3 was found. The resolution of the BPMs was estimated to be 1e-3. A frequency analysis showed no periodic features.
F.S. showed a slide on the specification of the DB feed-forward kickers. The required kick strength strongly depends on on the chicane R56 and geometry. To limit RF amplitude jitter in the PETS to an acceptable level the R56 cannot be too small.
F.S. listed the specifications of the RF in the MB RTML. The main issue is that currently the booster linac gradient must be stable within 4e-4. Depending on the chosen timing reference, the BC1 RF phase might be stable to within 0.04 deg @ 4GHz.
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