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The FiDeL Project

The FiDeL Project. L.Bottura following several, long brainstorming sessions with L. Deniau, J.P. Koutchouk, M. Lamont, N. Sammut, L. Walckiers, R. Wolf MARIC - March 1st, 2006. Outline. Context Aim of the FiDeL project FiDeL Concept Generation of sets of parameters Use of FiDeL

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The FiDeL Project

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  1. The FiDeL Project L.Bottura following several, long brainstorming sessions with L. Deniau, J.P. Koutchouk, M. Lamont, N. Sammut, L. Walckiers, R. Wolf MARIC - March 1st, 2006

  2. Outline • Context • Aim of the FiDeL project • FiDeL Concept • Generation of sets of parameters • Use of FiDeL • AT involvement • Project definition

  3. AB ? AB-OP TS-IC AT-MAS AT-MEL AT-MTM AT-MAS AT-MTM TS-SU FiDeL TS-SU AB-ABP AT contribution The helicopter view Reminder: magnetic re-set cycles

  4. Background • On magnetic references for the LHC: • No need to have reference magnets in the tunnel (DEWG 1996) • Idea of a magnetic reference for the LHC including a magnetic model (COOP Forum, December 1999) • No need to have reference magnets (RMS Review, July 2004) • Field Model definition (Chamonix 2005, PAC 2005) • On models for beam optics: • MAD model including measured field errors (AB-ABP & al., 2005) • MAD model including measurement uncertainties (Chamonix 2006) • On LHC control: • Field Model specifications included in a prototype of the ramp generator (Chamonix 2006)

  5. Aim of the FiDeL Project • A Field Description of the LHC to: • Describe the magnetic state of the LHC • Provide settings in the main magnets (MB, MQ, MQM, MQY, MQXx) and in the corrector circuits to prepare the LHC for injection, program the ramp, and reach known and corrected coast conditions • Provide trims for correction circuits during constant current plateaus, and especially to follow the field drift at injection • Provide trims for correction currents during the energy ramp, and especially during the snap-back at the beginning of the acceleration

  6. Field Model Unified description of the field and field errors Cn applicable to all LHC magnets Set of parametric equations for 7 physical components Geometric Persistent Saturation Residual magnetization Decay Snap-back Ramp Field parameters Adapt the parametric equations to fit the measured or expected behaviours of the magnets Set of ≈20 parameters, classified in 2 categories: Shape parameters, equal for all magnets of the same type and family (e.g. all MB’s with inner cable 01B) Amplitude parameters, specific to each magnet (e.g. geometric Cn) FiDeL FiDeL Concept Phys.Rev. Special Topics, Accelerators and Beams, 9, 012402, 2006

  7. Generation of parameters 2. tools to build and store the LHC configuration 1. synthesis of measured data 3. generation of the parameter set

  8. Bm / Im Cn(I,t,dI/dt,I(-t)) Im / cn Cn(I,t,dI/dt,I(-t)) Bn / In Cn(I,t,dI/dt,I(-t)) Use of FiDeL - LHC control Generate ramp for main ring magnets Generate ramp for corrector magnets Error forecast correction strategy Optics Bm(t) Im(t) Im(t) cn(t) Bn(t) In(t) Circuit Parameters

  9. Bm / Im Cn(I,t,dI/dt,I(-t)) I / cn Cn(I,t,dI/dt,I(-t)) Use of FiDeL - Optics studies ILHC(t) Ramp setting Error forecast Optics MAD Bset(t) Iset(t) I(t) cn(t) Magnet Parameters

  10. AT involvement • Short term (2006 to sector test/commissioning) • Define and validate the model • Create a common data structure • Collect, prune, and complement data for all magnet types • Generate the configuration sets from the circuit and machine layout • Medium term (2007-2008) • Participate in the implementation and test of the LHC configuration and control system • Prepare for commissioning through studies of the effect of magnetic uncertainties (within the scope of FQWG) • Adapt the parameters sets and create parameters trims tables during sector test/commissioning • Define, perform and analyse measurements on off-line benches in SM-18 (see: FaMe) • Long term (> 2008) • Maintain data structures, tools and settings • Participate/motivate MD and dedicated field measurements to optimise LHC operation FiDeL AT ?

  11. When ? • Proposal based on validation test during sector test

  12. Who ? • Mandate the FQWG to • Complete the definition of the project (interfaces, responsibilities, deliverables) • Compile above in a RDD to be agreed with AB-OP (LHC controls) and AB-ABP (MAD) • Propose participation of AT groups (MEL/MAS/MTM are natural candidates) • Provide the structure for coordination and follow-up of progress • Spin-off the team that will be in charge of the LHC magnetics

  13. Topics for discussion • OK on the short and medium term ? • Clarify the frame for the long term contribution of AT to the LHC operation and optimization, to provide a defined boundary for the exploitation of FiDeL

  14. FiDeL “components” In addition: residual magnetization and ramp (not visible above) Seven components of different physical origin to describe the field and field errors

  15. MB parameters for sector 7-8 Work in progress for decay/SB parameters

  16. Aim: Bdl = 1189.2 Tm for injection at 450 GeV Iterate: Bdl/154 = TF(I) Iset Result: TF = 10.118(0) Tm/kA Iset = 763.2(0) Integrated B1 in sector 7-8

  17. Plan for main optical elements in sector 7-8

  18. Plan for correctors/trims in sector 7-8

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