SPS RF Manipulations for Beam Dynamics Study
Explore the detailed discussions and manipulations conducted by the LIU-SPS Beam Dynamics Working Group regarding RF gymnastics, phase jumps, non-adiabatic voltage steps, and debunching techniques to enhance beam control and performance. Discover motivations, sequences, and hardware requirements for various beam manipulation scenarios aimed at improving beam stability and uniform distribution throughout the operational cycles.
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Presentation Transcript
LIU-SPS Beam Dynamics Working Group, 2019-03-28 SPS RF manipulations G. Papotti acks: T. Bohl, E. Shaposhnikova
outline introduce 3 manipulations: RF gymnastics by phase jump bunch rotation by non-adiabatic voltage step long/short debunching, recapture focus on motivation & pre-LS2 implementation (specs for LIU-SPS RF LL under discussion)
phase jump for Fixed Target motivation: slow extraction for pFT, iFT NA experiments need constant spill (during and across cycles) increase dp/p, flatten dp/p distribution, and debunch manipulation sequence: 1. phase jump to unstable phase 2. jump back to standard, stable phase, after t1 1. and 2. to increase and flatten dp/p 3. turn RF off (after t2) for debunching setting up optimize t1 for max peak (typ ~20 turns) adjust t2 to turn RF off at peak (typ ~2.3 ms) hw: 360 deg phase discriminator + inverting ampli. peak det Vtot inv ampli pol RF off t2 t1
non-adiab voltage step for pAWK motivation: short bunch at extraction for AWK hw did not allow for phase jump manipulation: non-adiabatic voltage step use pulse generator synchronized with extraction, thus AWAKE synch to frep, precision better than one turn risetime ~1 ms, amplitude Vtot = 7.8 MV lower voltage adiabatically first 800 MHz needs to follow OP needs to toggle back and forth trim voltage program & enable voltage pulse could see total voltage on Oasis, not in LSA extract
debunching, recapture motivation: want a constant spill for iFT 4 equidistant bunches, to uniformly distributed in buckets manipulation sequence (at interm. flat top) 1. turn RF off to allow debunching 2. then RF on to recapture OP to toggle 3 timings for debunching b-pulses off all RF off (ions prepare debunching, due to RFLL hw) recapture is fixed and untouched by OP 2 pairs of cavities at a time, 1 ms apart
long vs short debunching motivation: long debunching (ld): standard for physics operation short debunching (sd): for OP to setup the rest of the cycle (orbit, tune, ) implementation change the same 3 timings, to different delays minimum differences in setup post LS2: is no debunching an option? RF off (sd) RF off (ld) RF on
