Summary notes of the LCU meeting on 29/11/2011

Present: JA, HB, RC, RDM, LD, OD, SF, MF, MG, BH, JJ, YL, YP, AR, MS, RT, FZ, CY

Report from meetings

• SLM and general information -> MG
  There will be changes to the MARS interviews relevant for the CERN staff, following the implementation of the CERN competency model. More details will be given in curses which are expected to be compulsory for staff members.
  The cost index in the Geneva area was calculated for this year in turns out to be slightly negative. Salaries will remain stable, but the decrease will be kept in memory for future years.
  Our internal IPAC'12 deadline is over. For project related abstracts please make sure to also inform the project leader. The abstracts will be submitted to the BE department head by 1. December.
  Last week had the LHC-CC11 crab cavity workshop: follow up activities have been organised.
  HiLumi kick-off meeting and joint US-LARP meetings took place one week ago. Activities will be launched by the task leaders.
  Renovation work in the offices will start soon. The activities will be organised with work on groups of six offices and people move to the barracks outside. The work on the toilets is progressing.
  The LCU board is organised for 11/01/2012.
• LHC status -> BH
  Last week was very successful. The ion run proceeds very well.
• LBS -> HB
  The LBS#30 meeting took place on the 21/11. Agenda items were the running conditions with ions, muon backgrounds originating in off-momentum particles observed in CMS and plans for the machine detector interface for the LHC upgrade.
• LMC -> FZ
  FZ reported from the LMC last,week. For details see the minutes on the LMC page.

MAD-X status -> LD  (slides)
Laurent gave an update on the MAD-X status. The file splitting continued. There are now 66 modules and the global parts have been removed as planned. All wrapper have been removed as well.
E-groups have been created to improve the information flow. See the slides for more details.
activities on the physics, e.g., crab cavity implementation, will start soon.

LHC MD requests for 2012 -> Round table discussion
We had a first round table discussion of MD items. This will be used as input to the LSWG meeting next week and for a presentation by FZ on MD plans in Evian.
Overview of topics:
Several MDs on high-beta*. TOTEM and ALFA request operation at very high beta* in 2012 to reach the Coulomb interference region, which is known to be difficult at LHC energies. In addition, we need more information for extra cables or Q4 inversion relevant for the shutdown work in LS1.

Several of us collaborate on the planning of an MD on luminosity levelling using beta squeeze in collisions.
MDs on proton lead collisions in preparation to the next year's run.

Further MD items are emittance preservation, the effect of cavity noise and synchrobetatron resonances.

There will be requests for collimation and chromatic aberration, ATS optics, an improved IR6 optics, improved K-modulation tool, and non-linear beam dynamics.

Effect of a crab cavity on the particle trajectory -> FZ (slides)

The effect of a crab cavity in the LHC is studied for the HL-LHC and requires a detailed simulation.
There are still principle questions on how this could be done using field expansion techniques and integration of the equations of motion. The approach proposed by RdM is already expressing the integrated kick in terms of multipoles, hence the issue of integrating the equation of motion is solved since the beginning. It is proposed to move on two independent lines: implement the crab cavity model using the integrated kick developed in terms of RF-multipoles; analyse the expanded fields as proposed by R. Appleby at the LHC-CC1.
More on the implementation of the simulation of crab cavities in SIXTRACK will be discussed in the next LCU meeting in conjunction with ideas on how to have a clean implementation also in MAD-X.

AOB

Last update: 06-December-2011

MG & HB

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