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LIU-SPS Coordination Meeting

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LIU-SPS Coordination Meeting
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97904172722
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Kevin Shing Bruce Li
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Present: Alexandre Lasheen, Andy Butterworth, Anthony Rey, Antonio Grande Mallavia, Arthur Spierer, Brennan Goddard, Carlo Zannini, Chiara Pasquino, Christine Vollinger, Christos Zamantzas, Danilo Quartullo, David Mcfarlane, David Nisbet, David Walsh, Elena Chapochnikova, Eric Montesinos, Kiki Veyrunes, Etienne Carlier, Fabio Follin, Francesco Maria Velotti, Francois-Xavier Nuiry, Frank Gerigk, Gerd Kotzian, Giovanni Rumolo, Giulia Papotti, Gregoire Hagmann, Hannes Bartosik, Heiko Damerau, Ivan Karpov, Ivan Romera Ramirez , James Ridewood, Johan Dalla-Costa, Johannes Bernhard, Julie Coupard, Kevin Shing Bruce Li, Leandro Intelisano, Loic De Oliveira, Lotta Mether, Luciana Kolbeck, Maciej Suminski, Marine Gourber-Pace, Michael Schenk, Nico Madysa, Nicolas Magnin, Paul Cruikshank, Philippe Baudrenghien, Reyes Alemany Fernandez, Simon Albright, Stephane Cettour Cave, Tom Levens, Verena Kain, Wolfgang Hofle, Yannick Le Borgne, Zisou Charilaos

Action & matters arising

  • Define procedure on how to do dispersion measurements properly between PS and SPS; this was done in the 2012 the last by changing the frequency in the PS; check back on this and find good procedure --> longer term (OP + PS2SPS transfer)
  • Done: Tests from CCC to study potential impact of PCs on BTVs
  • Follow-up with magnet team and EPC to study orbit evolution and potential impact of different elements (extraction, TT10 quads,...) --> longer term (OP, EPC, Magnets)
  • Repeat crystal loss reduction test with ZS and girders in (scheduled)
  • At every intensity step we should redo the procure, moving the dump though the ramp in steps, and slowly
  • How to work on NA beamline setting up and HiRadMat acceleration commissioning?

Kicker waveform scans for extraction; update in dispersion mismatch

  • Checked Aloha for suggestion of best correctors for kick response measurements
  • Check in PS revealed quads in TT2 that were not well set
  • All effects found helped to improve the mismatch, but are not able to explain the deviations observed
  • For Q20 cannot do the variation of fields at extraction in the PS - measurement thus, is rather tricky;
  • Francesco will investigate quads in more detail to see how this behaves;
  • Waveform scan redone:
  • MKE4 and MK6 wave forms measured; consistent with pre-LS2; shift od 2 us found due to change of position where beam is injected; delay set up;
  • V: are the settings also this also good for HiRadMat;

Update on noise measurements

  • Took measurements comparing 2018 excitation of single bunches, reconstructing tune spectrum to understand situation before EPC worked on filter capacitor; will do similar measurements now after the EPC intervention; can give a more extensive update next week;

Status of scrubbing run

  • Last week were at 2 batches of 72 bunches, main limitations were MKDV and vacuum in sectors 6 and 5; pressure thresholds moved up to 1e-5 which improved situation and allowed for faster scrubbing; 4 batches at full flat bottom reached by end of last week;
  • MKP heating limitation reached by last Sunday; weekend pressure evolution shows significant scrubbing achieved over the weekend; pressures dropped roughly by 50%.
  • beam quality evolution;
  • Batch spacing now reduced from 400 ns to 250 ns;
  • MKDV pressure decreasing gradually and approaching the nominal threshold values; how will this behave along the ramp?
  • First instabilities also seen; but at flat bottom no clear signs of instabilities seen like in the past
  • V: in the past we did scrubbing at 26 GeV; it doesn't seem that this is sufficient to accelerate our nominal bunch intensity; H: we scrub with higher intensity at FB and hope that this can be accommodated by
  • Chiara: gauge stability in4 are being checked; peaks that Lotta was showing are not only on the gauge but also on the ions pumps; they last few could of mins so it is real outgassing; could be non-conformities at level of RF fingers; would be good to see if this changes with intensity; ACTION: keep an eye on this;

Update on RF planning

  • No update given this time

WS application news

  • WS updates; updates implemented to the old application; requests collected on CodiMD; dev release available in the SPS CCM
  • Quick look at new version;
  • Hannes: display how may bunches are falling into selection criteria? How many bunches are considered and what is the average emittances;

Round table

  • Took back HiRadMat2 cycle and found that we need to improve for switching beam types; PS has similar problems; if copies change after a while, this is no longer reflected;
  • Reyes: is the ion cycle is ready? Hannes: this is prepared an ready and has been asked already by Philippe;
  • David: YETS been extended by 3 week; original closure date moved from Tuesday 11 to Friday 28; no additional work was foreseen; ABT was contacted for MKP-L, but this will not be ready so no change foreseen; RP asked for 1 week of cool-down, no access during first week of YETS;
  • Verena: Nico has included total voltage in optimizer - this can be tested on transition crossing;
  • Etienne: keep EN-STI in the loop;
  • Danilo: update on emittance blow-up;
  • Chiara: could have some time to check maintenance of ions pumps; is very adaptable but would be nice to have some time; scrubbing run, how long do you think this will;
  • Alex: PS2SPS WG meeting on Friday; looking into PS bunch rotation;
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