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LHC On-Line Modeling

LHC On-Line Modeling. Goal of the LHC On-line Model The Team and the Tasks Status of MAD-X Scheme of the LHC On-line Model Interface to LSA Examples of NL measurements to understand the “real” model Conclusion. Goal of the LHC On-Line Model?. Main design features:

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LHC On-Line Modeling

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  1. LHC On-Line Modeling • Goal of the LHC On-line Model • The Team and the Tasks • Status of MAD-X • Scheme of the LHC On-line Model • Interface to LSA • Examples of NL measurements to understand the “real” model • Conclusion ESRF-NLBDWS, May 2008

  2. Goal of the LHC On-Line Model? • Main design features: • MAD-X is the principle engine of the LHC on-line model. • A complete and trustworthy (non-)linear model of the LHC will be composed with the databases of the measured magnet errors and beam-based measurements. • Testing of knobs with MAD-X before send-to-hardware. • The online model is not a real-time tool but should give answers within in minutes. • All functionalities of MAD-X are utilized  Duplication with other tools may occur but the emphasis is on uncovered features. • Experimenters and operators should profit from a fully functional on-line tool. • Speed-up the off-line analysis time such that it can be done in the control room. ESRF-NLBDWS, May 2008

  3. The Team and Tasks • Frank Schmidt –Overall Responsibility, MAD-X General Support, (Non-)linear LHC Model from Fidel/Wise • Werner Herr – Responsibility for Applications, SDDS MAD-X Version, Closed Orbit Correction • Ilya Agapov – Interface to Control System, Application Development, Beam-Based Model Adjustments, PTC_TWISS module • Massimo Giovannozzi, Thys Risselada – LHC Optics, Fidel/Wise, MAD-X Error Routines • In Collaboration with: • Fidel & Wise (Laurent Deniau, Luca Bottura, Rob Wolf and team & Per Hagen) - Harmonics • Rogelio Tomás,Masamitsu Aiba & Akio Morita (KEK), Rama Calaga (BNL) , GlennVanbavinckhove – Beta-Beating • Gianluigi Arduini, Jörg Wenninger, V. Kain – SPS Operation, 1000 turn BPM system, Standardization of SDDS • LSA Team (Mike Lamont, Greg Kruk, Jutta Netzel) – General control system support • Alastair Bland – TECHNET Support ESRF-NLBDWS, May 2008

  4. Status of MAD-X • Is MAD-X ready for the LHC commissioning?  • Is MAD-X properly maintained? ABP no longer provide several exclusive FTEs for program development and maintenance, instead there is one code custodian and a large group of MAD-X Module Keepers. • Is MAD-X still further developed? ABP has stopped the full blast develop- ment of MAD-X since the code fulfills the minimum LHC requirements. However, work is being done for a full PTC object oriented LHC on-line model.  • Is MAD-X reliable? MAD-X has made use of the well debugged MAD8. Moreover, the independent programs SixTrack and PTC provide a continuous check such that any inconsistency could be eliminated. • Is MAD-X fast? There is some speed loss compared to MAD8 due to the mixture of Fortran and C. The object oriented PTC extension is more time consuming by definition. ESRF-NLBDWS, May 2008

  5. 1 2 Beam Errors Fidel/Wise Misalignment Closed Orbit Hardware Sequence Strength Camif Aperture Model DB Scheme of the On-Line Model Off-line Model Real Model of the Machine Knobs Feed-back ESRF-NLBDWS, May 2008

  6. OM Manager OM Server LSA Data lhcutils Library (Python) Java Libraries LSA Client Program (E.G. Knobs) Repository of Optics files, MAD-X and other Scripts Interface to LSA Application Data Access ESRF-NLBDWS, May 2008

  7. Relation Accelerator versus Computer Model Accelerator Model Accelerator Single particle tracking data BPM data FFT spectral lines FFT spectral lines • detuning with amplitude • resonance driving terms ESRF-NLBDWS, May 2008

  8. Missing Sextupoles (SPS) (F. Schmidt, R. Tomas et al.) Before Specially arranged SPS configuration for extraction sextupoles + + + + - - - - (3,0) resonance driving terms Data fully decohered (factor 2 correction applied) Comparison with nominal model One extraction sextupole accidentally disconnect After ESRF-NLBDWS, May 2008

  9. Uncompensated Skew Sextupole Resonance (PSBooster) (P. Urschütz, M. Benedikt) phase space vertical motion CERN PS data vertical plane 3Qy = 16 and (0, -2) spectral line Uncorrected machine beam losses FFT ESRF-NLBDWS, May 2008

  10. Corrected Skew Sextupole Resonance (PSBooster) (P. Urschütz, M. Benedikt) phase space CERN PS data vertical plane 3Qy = 16 and (0, -2) spectral line Resonance compensated with skew sextupoles Setting based on the reduction of the (0, -2) line amplitude vertical motion beam losses FFT ESRF-NLBDWS, May 2008

  11. Longitudinal Location of strong Sextupoles (Tevatron) Y. Alexahin, F. Schmidt et al. EPAC06 (3,0) resonance detection from (-2,0) spectral line at Tevatron Tracking data Beam data ESRF-NLBDWS, May 2008

  12. Conclusion • Release of the Online Model Software • Model of the LHC (still work in progress) • Experiments and Testing • Applying the Online Model in the SPS start-up with beam. • Complementing the theoretical SPS model with beam-based corrections  needed for the LHC. • Being ready for Sector Test and LHC Commissioning! ESRF-NLBDWS, May 2008

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