Minutes of the ICE section
91st meeting on Wednesday 04/09/2013 (08:40-10:30, 6/2-004)
ICE members: Adrian Oeftiger (AO), Andrea Passarelli (AP), Benoit Salvant (BS), Carlo Zannini (CZ), Danilo Banfi (DB), Daria Astapovych (DA), Elias Metral (EM), Elena Wildner (EW), Frank Schmidt (FS), Giovanni Iadarola (GI), Giovanni Rumolo (GR), Javier Barranco (JB), Kevin Shing Bruce Li (KL), Nicolo Biancacci (NB), Nicolas Mounet (NM), Olav Ejner Berrig (OB), Serena Persichelli (SP), Sergio Rioja Fuentelsaz (SRF), Tatiana Pieloni (TP), Werner Herr (WH), Xavier Buffat (XB).
Present/Excused: AO, AP, BS, CZ, DB, DA, EM, EW, FS, GI, GR, JB, KL, NB, NM, OB, SP, SRF, TP, WH, XB, HannesB, SimonW.
1) Newcomers / visitors
- Newborn Camilla, daughter of CarloZ and TatianaR => Congratulations!
2) Comments on the minutes of the previous 90th meeting + Actions
- No comment.
3) General infos
- No particular comment from anyone.
- SL meeting:
- Marc Tavlet still looking for some volunteers for training (rescue mask etc.).
- LS1:
- Vacuum leak in PSB, but still hope that this will be solved before the planned start-up.
- Bellow leak in the LHC DFB in point 6 => Potentially worrying.
- Summary of the review of the LIU-SPS High Bandwidth Transverse Damper (30/07/2013) is available => http://indico.cern.ch/materialDisplay.py?materialId=0&confId=260522.
- SC and Impedance meetings => Discussed later.
- ManfredW has news on BSRT => Imped talk on Monday.
4) Status of the work for the internal review on the LHC performance limitations during run I (on 25-26/09/2013) => All the speakers
- Injection instabilities progressing well.
5) Brief reports of the 4 WGs (by the WG leader or replacement) => Plan, activities, deadlines, issues, etc.:
a) BB (WH):
- No particular news, ongoing work for the LHC performance review. TP looking into SMOG detector.
b) SC (FS):
- SC meeting last week => Every 2 weeks in the future: on Thursdays between 14:00 and 16:00 and most of the time in room 6-R-012.
- Planned consolidation of the PTC-ORBIT & SYNERGIA codes including a manual by the end of the year.
- MAD-X with frozen space charge is ready for usage except for some minor inconveniences.
- HarryR has managed to pin down a nasty avalanche effect killing all particles in the ORBIT part of PTC-ORBIT and he found a possible workaround. This problem is aggravated by the fact that MPI_add is not reproducible leading to particle loss in a range of some 1'000 to 2'000 turns (days of CPU time!).
- We are in the process to find out if MPI can be "taught" to do its operations in a fixed order so that strict reproducibility of the results can be enforced. It remains to be seen how much loss in MPI speed-up that will cost.
- ElenaB presented a fix to PTC such that the relevant parameters of acceleration are properly transferred to ORBIT.
c) EC (GR):
- Next EC meeting nextweek by GI on LHC triplets.
- From a recent endoscopy, there is no observed EC sign in the triplets.
d) IMPED (BS):
- See slides.
- Discussion about procedure to have the multi-bunch RF heating, temperature, stresses etc. => EM simulations needed, thermal simulations needed and mechanical simulations needed...
6) Actions to be taken for the next meeting
- Old actions.
7) Miscellaneous
- Deadlines and important dates for ICE.
- The next (92nd) meeting will take place on 11/09/2013 => Agenda:
1) Status of the work for the internal review on the LHC performance limitations during run I (on 25-26/09/2013) => All the speakers.
- See preliminary agendas for the next meetings.
- See List of Actions.
Minutes by E. Metral, 09/09/2013.