From: Werner Herr [zwe@mail6.cern.ch]
Sent: Friday, December 17, 2004 3:23 PM
To: Alexej Grudiev; Charles Hill; Daniel Schulte; Elena Benedetto; Elias
Metral; Elmar Vogel; Francesco Ruggiero; Frank Zimmermann; Gianluigi
Arduini; Gregory Penn; Helmut Burkhardt; Javier Resta Lopez; Jean-Pierre
Riunaud; John Jowett; Juliette Thomashausen; Karlheinz Schindl;
lronen@techunix.technion.ac.il; Louis Rinolfi; Maxim Korostelev; Michel
Martini; Oliver Bruning; Peder Eliasson; Ralph Wolfgang Assmann; Tatiana
Pieloni; Werner Herr
Subject: Minutes of the LCE meeting, 17.12.2004




-----------------------------------------------------------------------
Minutes of the ABP-LCE section meeting of 17.12.04

present: EB, WH, EM, TP, JPR, DS
excused: FR, FZ, EV
-----------------------------------------------------------------------


(1) Minutes from previous meetings and pending actions
------------------------------------------------------
-last minutes (EV, BZ)
WH explained the lack of minutes for the last LCE meeting (10.12.) The large number of absentees resulted in a very reduced attendance (WH, EM and EV).
He summarized the points discussed: 
OLD ACTION -> EM had contacted B. Zotter and his presentation is now foreseen for the 11.2.2005.
EV prepared a paper and he will present the basic concepts and results in an AP forum next year

(VERY) OLD ACTION -> EM and/or FZ will review Landau-damping mechanisms.
STATUS: pending. Low priority.


(2) Reports from Meetings
-------------------------

- JPR showed and explained the new structure of the group, mainly to the
  benefits of the non-staff members of the section and focused on
  changes to the LCE (future RLC) section.

- The presentation by EM at the recent LTC meeting was well received
  and led to useful discussions.

- No relevant news (yet) from the LHC MAC. Talks were well received.

- JPR mentioned a discussion on office space during the last section
  leader meeting, in particular a somewhat unexpected and apparently
  uncoordinated occupation of available office space in the vicinity
  of the APB group's cms. The need for offices on the Prevessin site
  for people involved in commissioning is recognized.
  These issues will be followed up.


(3) AOB
-------

- Both, WH and JPR mentioned a recent e-mail exchange concerning the use
  of damper and/or PLL and/or Landau damping octupoles, in particular
  the possible effects during a physics store, i.e. with colliding beams.
  The question whether this can lead to a heating needs to be evaluated
  and a presentation at the forthcoming workshop (March, April ?) next
  year should be envisaged. WH strongly suggested to included the proposed
  orbit feedback system into this evaluation if it is planned to be used
  in physics conditions.
  ACTION -> whole section, will be discussed a.s.a.p. next year.

(4) Round table on present activities (LCE related)
---------------------------------------------------

EM: work will be done for the forthcoming PS/SPS days (13.+14.1.)
    the papers on Montague resonance and the HHH contribution will
    be finalized.

WH: his work on MADX is completed and included in the newest version
    which is released following decisions by the MADX module keepers
    meeting (15.12.). He restarted the work on beam-beam tracking with
    linear imperfections. A more general discussion on the coordination
    of tracking (lin. imp., crossing schemes etc.) and the distribution
    of work should be done early next year with the people concerned
    from the LOC section (after the return of FR).

TP: reported on results from simulations with the program COMBI.
    The simulation program as well as the numerical method (matrix
    formulation and evaluation of eigenvalues and -modes) have been
    extended. Preliminary results are available on the beam response
    to different excitation and measurements strategies. A presentation
    will be given next year when FR is back.
    The results will support the specification of LHC instrumentation 
    and the AP needs for studies.
    The contribution for the HHH workshop will be completed.
    Her contract with EPFL is confirmed and A. Wrulich and A. Bay
    are the EPFL supervisors.

EB: collaborates with G. Arduini on the analysis of recent SPS MD data, 
    this should allow a good benchmarking of the simulations.
    With stored beams at 26 GeV she accumulated e-cloud data,
    and relevant input for the simulation.
    This work is close to completion.
   
    She continues the study how the number of kicks in her simulation
    program influence the resulting emittance growth. In particular, whether
    systematic resonances causing the orbserved differences.
    A presentation at the Politecnico di Torino was given on the status
    of her thesis.

DS: mainly involved in CLIC related activities


                                               WH, TP

      









--
---
W. Herr, AB-Division, CERN, CH-1211 Geneva 23, Switzerland Tel. +41 22 767 4781, Fax. +41 22 767 8480,
E-mail: Werner.Herr@cern.ch
Internet: http://cern.ch/Werner.Herr/