All Experimenters Meeting Pbar Department Meeting Jim Morgan
All Experimenter’s Meeting Pbar Department Meeting Jim Morgan, February 22, 2007
Stacking
Stacking
Operational stuff § Stacking record, 22. 24 E 10/Hr § Poor transfer efficiency when A: EKIK ran 10 k. V higher than desired § ARF-1 output wandering § A/C for Debuncher RF rack cuts out again § 4 -8 GHz core momentum timing continues to change § D: H 704 phase inbalance trips § Study period/Vault access on Monday 2/19 Ø Ø Ø Target rotation problem worked on (encoder binding) Investigated why spare 15 V supplies didn’t work in D: H 704 ARF-1 cabling checked Stacktail leveling set-up Pre-Vault access to work on OTR motion control § Two transfers to Recycler lost when A: EKIK appeared to fire early § ARF-2/3/4 frequency offset fixed § D: H 926 changed output on several pbar transfers
Recent studies/tasks § Stacking Lens gradient vs. yield 2. 2 second cycle time Overthruster and AP-2 orbit Upstream Beam Sweeping power supply being prepared for use Ø ARF-1 injection frequency referenced to a DDS Ø Ø § Transfers to Recycler Ø Trying to understand drop in efficiency between Accumulator and D: TOR 910 Ø Small tasks related to ramping AP-1 (M: Q 105 I&V ramp test, M: HV 100 and M: HV 102 reference resolution)
Studies coming up (short term) § Stacking Ø Accumulator high dispersion BPM response as a function of energy/position (clean machine) Ø Lattice measurements for both rings Ø Debuncher stochastic cooling tank physical apertures Ø A 60 D’ correction § 2. 2 second cycle time Ø Initially with experts present, then Operators only § Transfers to Recycler Ø Work towards ramping AP-1 Ø Identify source of wandering closure
Studies coming up (longer term) § Stacking Ø Ø Ø Ø Stacktail heating measurements Beamline orbit during stacking Try to use Δ kickers Increase lithium lens gradient Stacktail gain ramping Run upstream sweeping system Increase number of stacking events during Collider shots § Transfers to Recycler Ø Increase ARF 4 voltage to shorten bunches Ø New (old) orbit reference file for beamlines Ø Sequencer aggregates with stacking intervals between individual shots § General Ø Measure η at edges of momentum aperture
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