HIGHLIGHTS OF LOC ACTIVITIES IN 2006 M' Giovannozzi on behalf of LOC members

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HIGHLIGHTS OF LOC ACTIVITIES IN 2006 M.
Giovannozzion behalf of LOC members
Yannis Papaphilippou Thys Risselada Guillaume
Robert-DemolaizeFederico Roncarolo Frank
Schmidt Thomas Weiler
Ralph AssmannChiara BraccoHelmut
BurkhardtRiccardo de MariaStéphane
FartoukhJean-Bernard JeanneretAlex
KoschikLionel Neukermans
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Summary

• LHC Magnets activities
• LHC optics
• LHC MAD-X on-line model
• Software tools for beam dynamics simulations
• LHC Commissioning
• Collimation Team

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LHC Magnets activities - I

• LHC Magnet Team S.Fartoukh, J.-B. Jeanneret, Y.
  Papaphilippou, F. Schmidt, M. Giovannozzi (with
  support from S. Gilardoni - LII).
• Structure each team member is responsible for a
  set of magnets classes
• S. Fartoukh main dipole and Activity Leader
• Y. Papaphilippou main quadrupoles
• F. Schmidt low-beta triplets
• M. Giovannozzi insertion magnets (dipoles and
  quadrupoles) and MEB secretary
• J.-B. Jeanneret aperture expert and consultant
  for all magnet classes
• S. Gilardoni support for main dipoles geometry.
• Results of studies reported at Magnet Evaluation
  Board, where each magnet is assigned to a
  specific slot in the LHC ring defining optimised
  installation sequence.

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LHC Magnets activities - II

• Aim improve/optimize machine performance
• Approach use mechanical/geometrical data and
  measured field quality to define slot in the
  machine.

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Flip-flop and ppairing on b3 in sector 78 and 34
Typical p-pairing flip-flop

Typical p-pairing flip-flop
Few Xs3s
Alstom and Ansaldo with very low b3.
Xs1 Noell magnets
Sector 78 ap. V1
Sector 34 ap. V2
S. Fartoukh, MEB107
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LHC Magnets activities - III

• Results (approval status)
• Main dipoles 83 approved (1018 MBs)
• Main quadrupoles 84 approved (301 SSS)
• Low-beta triplets 83 approved (20 MQX)
• Insertion magnets
• D1 (cold and warm) -gt 100 approved
• D2 -gt 75 approved
• D3/D4 (cold and warm) -gt 100 approved
• Warm quadrupoles -gt 100 approved
• Other insertion quadrupoles -gt 59 approved
• The expertise will be used for the commissioning!

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LHC optics - I

• The section is also responsible for the optics of
  the machine, the official database (both machine
  and transfer lines)
• Insertion optics responsible
• IR1/IR5 (ATLAS/CMS) S. Fartoukh
• special high-beta configurations, e.g., TOTEM H.
  Burkhardt.
• FP420 F. Roncarolo
• IR2 (ALICE) J. Jowett (LII)
• IR3/IR7 (Collimation IRs) T. Risselada
• IR8 (LHCB) Y. Papaphilippou
• IR4/IR6 (RF and beam dump IRs) M. Giovannozzi
• LHC injection H. Burkhardt, A. Koschik and T.
  Risselada

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LHC optics - II

• The official optics database is maintained by T.
  Risselada -gt /afs/cern.ch/eng/lhc/optics/V6.500.

IR2, Beam 1 envelope

• The official web pages are generated by J. Jowett
  -gt http//cern.ch/lhcoptics. They allow
  functional access (via Java, Excel, etc.) to the
  optics MAD files, aperture model and
  pre-calculated optics data across the Internet

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LHC optics - III

• Some results
• Finalisation of V6.500 optics (including aperture
  model).
• Computation of the complete squeeze sequence for
  IR1/5 including also crossing scheme.
• Analysis of the optics for the special
  configuration for the 450 GeV run in 2007.
• Computation of a special flat beam optics for
  IR1/5 allowing luminosity increase
• Preparation of the sequence for Beam 2 for
  tracking (long-standing issue)
• Work in progress
• New optics for IR3/7?
• On top of the linear optics activities, numerical
  simulations (tracking) absorb quite some
  resources (also for IR upgrade studies -gt R. de
  Maria)!
• Efforts to improve routines to assign magnetic
  errors and possibility to use magnetic errors
  from database (joint enterprise with AT/MAS).
  Misalignment errors will come (soon).
• Study of beta-beating using measured magnetic
  errors (R. Tomás RLC - and R. Calaga)

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LHC MAD-X on-line model

• One of the tasks of the section is also to
  prepare an on-line model for the LHC in view of
  machine commissioning and operation
• Responsible F. Schmidt with contributions by W.
  Herr
• First milestone CNGS commissioning.
• Results
• validation of software tools.
• SDDS is now in MAD-X.
• Analysis of missing items.
• In the future, the SPS will be used as test bed
  for additional tests.

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Software tools for beam dynamics simulations

• Responsibility for the main simulation programs,
  MAD-X and SixTrack-gt F. Schmidt is the custodian.
• Level of support changed in order to cope with
  other tasks (MAD-X on-line model).
• Polymorphic Tracking Code fully embedded in MAD-X
  to provide functionalities for the on-line model
  (thanks also to É. Forest).
• The generic tracking environment was developed by
  F. Schmidt with contributions from E. McIntosh.
  This allows running simulations on
• CERN lxplus cluster
• CERN CPSS (your PC once it is inactive)
• BOINC (PC cluster world-wide) and
• GRID

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LHC Commissioning

• People involved
• Future Commissioner in Charge R. Assmann, S.
  Fartoukh, M. Giovannozzi.
• Responsible for experimental backgrounds H.
  Burkhardt
• System responsible/support (machine,
  instrumentation etc.) almost all LOC member will
  contribute to these efforts
• Last but not leastwe contribute to many
  Committees and working Groups
• Collimation Working Group
• Field Quality Working Group
• LHC Commissioning Working Group
• LHC Technical Committee
• LHC Technical Coordination Committee
• Machine Protection Working Group
• Magnet Evaluation Board
• Working Group on Alignment

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Collimation Team

• Members R. Assmann (LHC Collimation PL), C.
  Bracco, G. Robert-Demolaize, (S. Redaelli is
  still contributing), T. Weiler.
• Main tasks evaluation of the performance of the
  collimation system and operational procedures.

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First LHC Collimators Produced and Installed
10 minutes installation checking on quick-plugs
First ring collimator in 8L. (triplet protection
for beam 1) - June 14th -
Courtesy R. Assmann
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Beam1 and Beam 2 Loss Simulations
Courtesy R. Assmann
Beam1, 7 TeV Betatron cleaning Ideal performance
TCDQ
Quench limit (nominal I, t0.2h)
Local inefficiency 1/m
Beam2, 7 TeV Betatron cleaning Ideal performance
TCDQ
Quench limit (nominal I, t0.2h)
Local inefficiency p lost in bin over total p
lost over length of aperture bin! New!