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

HIGHLIGHTS OF LOC ACTIVITIES IN 2006 M. Giovannozzi on behalf of LOC members. Yannis Papaphilippou Thys Risselada Guillaume Robert-Demolaize Fe derico Roncarolo Frank Schmidt Thomas Weiler.

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

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  1. 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 MG – ABP General meeting

  2. Summary • LHC Magnets activities • LHC optics • LHC MAD-X on-line model • Software tools for beam dynamics simulations • LHC Commissioning • Collimation Team MG – ABP General meeting

  3. 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. MG – ABP General meeting

  4. LHC Magnets activities - II • Aim: improve/optimize machine performance • Approach: use mechanical/geometrical data and measured field quality to define slot in the machine. MG – ABP General meeting

  5. Flip-flop and p–pairing on b3 in sector 78 and 34 Typical p-pairing + flip-flop Typical p-pairing +flip-flop Few Xs3’s Alstom and Ansaldo with very low b3. Xs1 Noell magnets Sector 78: ap. V1 Sector 34: ap. V2 MG – ABP General meeting S. Fartoukh, MEB107

  6. 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) -> 100% approved • D2 -> 75% approved • D3/D4 (cold and warm) -> 100% approved • Warm quadrupoles -> 100% approved • Other insertion quadrupoles -> 59% approved • The expertise will be used for the commissioning! MG – ABP General meeting

  7. 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 MG – ABP General meeting

  8. LHC optics - II • The official optics database is maintained by T. Risselada -> /afs/cern.ch/eng/lhc/optics/V6.500. IR2, Beam 1 envelope • The official web pages are generated by J. Jowett -> 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 MG – ABP General meeting

  9. b* =11m (injection optics with phase shift Dmx/y=0.015/0.005 to accomodate the collision tune) b* =7m b* =5m b* =4m b* =1.5m b* =0.55m 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 -> 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) MG – ABP General meeting

  10. 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. MG – ABP General meeting

  11. Software tools for beam dynamics simulations Responsibility for the main simulation programs, MAD-X and SixTrack-> 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 MG – ABP General meeting

  12. 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 least…we 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 MG – ABP General meeting

  13. 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. MG – ABP General meeting

  14. 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 MG – ABP General meeting

  15. Beam1 and Beam 2 Loss Simulations Courtesy R. Assmann Beam1, 7 TeV Betatron cleaning Ideal performance TCDQ Quench limit (nominal I, t=0.2h) Local inefficiency [1/m] Beam2, 7 TeV Betatron cleaning Ideal performance TCDQ Quench limit (nominal I, t=0.2h) Local inefficiency: #p lost in bin over total #p lost over length of aperture bin! New! MG – ABP General meeting

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