BPM Orbit Data Analysis with Wakefields Glen White, SLAC January 2013.

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Presentation transcript:

BPM Orbit Data Analysis with Wakefields Glen White, SLAC January 2013

FFS Orbit Stability Swing shift 12/18 orbit changed by moving MQM16FF 60um vertically. Beam size improved by 50nm – 30nm due to change in oribit in FFS sextupoles – Rest due to wakefields? Orbit seen to drift around vertically in FFS with this pattern. – From simulation, tolerance for this is +/- 150um at the MQF4AFF/MQD10AFF beta peaks -> ~2nm beam size growth – Drift with EXT/FFS feedback active is observed to be less than this so OK. – This tolerance drops to 70um when including cavity wakes at 1E10 charge, and 125um at 1E9 charge. In model, this orbit generates 30nm beam size growth at IP due to change in vertical orbit in sextupoles 0.2M -> 0.4M (250nm -> 200nm) MQF4AFF MQD10AFF +/- 125um at MQD10AFF over 12 hours

Simulate FFS Orbit Offset Beam size at IP from tracking simulation. Start perfect lattice, offset QM16FF by 60um. Include 0.1V/mm/pC wake in cavities. sigma_y +50nm

BPM Orbit With Respect to BPM Centres 30 mins data taken from Friday Dec 21 archive. – (Data archived at 1Hz) Charge cuts applied based on reference cavity data.

Simulate Wakefield Effect on IP Beam Size Using cavity wakes calculated by A. Lyapin for 9 and 12 mm Track 2E4 macro-particle bunch through FFS, apply convoluted wake function at each cavity BPM location using measured BPM offset. Record IP vertical spot size for each pulse. Beamline is otherwise perfect, using 24pm input beam vertical emittance. 9 mm 12 mm

IP Beam Size from Cavity Wakes Used double wake potential (peak ~0.2 V/pC/mm) Design beam charge (1E10) With December conditions (Bunch length ~12mm?, 1E9 charge), effect is negligible

Emittance in EXT Q=3E9 – 1.9nm x 30pm Q=1E9 – 1.4nm x – 44nm -> 54nm No EXT emittance change observed with DR RF V