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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. 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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