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LIU-SPS Coordination Meeting
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LIU-SPS Coordination Meeting
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, Elena Chapochnikova, Eric Montesinos, Kiki Veyrunes, Etienne Carlier, Fabio Follin, Francesco Maria Velotti, Francois-Xavier Nuiry, Frank Gerigk, Gerd Kotzian, Gino Cipolla, 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
BC planning update (Kevin Li)
Scrubbing status (Lotta Mether)
- Scrubbing with 4 batches at FB during the night; scrubbing slowing down and machine quite well scrubbed; temperature limit of MKPs reached;
- Ramps on HiRadMat cycle done with 1 batch;
- Thursday first night scrubbing along the ramp;
- Friday starting to ramp up number of batches on ramp - main limitation was pressure in MKDV, in particular when dumping the beam at higher energies; very slow moving up the ramp and conditioning in parallel;
- Sunday got to 4 batches before kicker fault;no more ramp until Monday
- Monday some scrubbing with radial steering - nice conditioning observed;
RF status update (Philippe Baudrenghien, Kevin Li)
800 MHz phasing and stability (Ivan Karpov, Giulia Papotti)
- Phasing down using tilt method - taking mid-points from line density and comparing
- First scans done after LS2 focusing on speed rather than precision, doing less averaging over several acquisitions; rough phasing in is done
- Phase scans done for cavity 1 and 2 - scanning all 2*pi range along flat bottom; can see different bunch length modes on ABWLM acquisition;
- Reference measurements taken with RF off;
- For next time finish debugging scripts; ABWLM upgrade needed (last piece of fiber to be finalized);
- LSA integration not yet fully completed;
- Length of a phasing campaign should be about 1 hour per cavity; main improvement is scanning phase on long flat bottom;
- Behavior of tilt as we scan phase - why do we have an angle on the measured profile? G: Probably because we have some additional components sent to the HW from the settings;
- Alex: would be interesting to seem from simulation what is the relative amplitude between 200 and 800; we can have less effective voltage from the higher harmonic than expected, this was observed already in the past;
- Heiko: how sure can you be that when everything is adjusted at flat bottom it also works out along the ramp? Giulia: we have a setting that can be adjusted to take into account the frequency shifts also along the ramp; moreover one can do a faster phase scan to sample points along the cycle;
- Hannes: where do we stand with voltage that we can get for 800? Not beyond 800 kV without beam loading - the ultimate max is at 1 MV; Hannes: is this clamped at the moment? Giulia: not sure if we have a switch and limit programmed at the moment;
Status of RF conditioning (Eric Montesinos, Gino Cipolla)
- Conditioning cycles regularly taken; unfortunately, cavity has no memory; conditioning needs to be redone but takes just about 20 minutes;
- Next step is to implement an automatic RF switch to put conditioning when there is no beam during every cycle;
- Maximum at the moment? 500 kW for Philips and Siemens and more for Thales? Hannes: any visible improvement on the maximum attainable over last 2 month;
Ripples measurements (Hannes Bartosik)
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