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Follow-up PSB H- chicane magnets: Inconel vacuum chamber option & consequences on beam dynamics

Follow-up PSB H- chicane magnets: Inconel vacuum chamber option & consequences on beam dynamics. E. Benedetto LIU-PSB Meeting, 26/9/2013. Aim. Evaluate differences wrt space charge between: Ceramic chamber Inconel chamber (eddy currents inducing multipolar errors)

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Follow-up PSB H- chicane magnets: Inconel vacuum chamber option & consequences on beam dynamics

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  1. Follow-upPSB H- chicane magnets: Inconel vacuum chamber option & consequences on beam dynamics E. Benedetto LIU-PSB Meeting, 26/9/2013

  2. Aim • Evaluate differences wrt space charge between: • Ceramic chamber • Inconel chamber (eddy currents inducing multipolar errors) • See presentation LIU-PSB on 30/5/2013 • Very intense LHC beam (last presentation) • Today results for: • LHC type beam, still with painting, Ex*=1.2um, Np=160e10 • Isolde type beam, Np=1e13, Ex*=9um, Ey*=6um NB: THESE RESULTS ARE VALID IN RELATIVE, i.e. for ourcomparison, WHILE FOR THE ABSOLUTE VALUE MORE WORK IS NEEDED, bothfrom the PSB opticsmodeling AND code debugging/benchmarking

  3. Limitations • The model is very simple • Double harmonics • Acceleration • No errors & non-linearities in the lattice except… • The only errors are in the chicane magnets, i.e <1/16 machine (and QNO correctors) NB: THESE RESULTS ARE VALID IN RELATIVE, i.e. for ourcomparison, WHILE FOR THE ABSOLUTE VALUE MORE WORK IS NEEDED, bothfrom the PSB opticsmodeling AND code debugging/benchmarking

  4. ``Very intense`` lhcbeam(see30/5/13) E* (um) RED: ceramic GREEN: inconel, no compensation BLUE: inconel Vertical Horizontal Np=350e10 Qh=4.28, Qv=4.55 turns • Large growth in horizontal, due to (too) large DQ & integer crossing

  5. LHC type beam (producedwith 20t painting) E* (um) RED: ceramic GREEN: inconel, no compensation BLUE: inconel Vertical Horizontal Np=160e10 Qh=4.28, Qv=4.55 turns • No more growth in horizontal

  6. Isolde beam(1/4) • Produced byC.Braccowithoptimized painting bumpfunction(seeFollow-up H- injection review: https://indico.cern.ch/conferenceTimeTable.py?confId=158153#20111109 ) • WithOrbit (by Chiara) up to turn159, to have completefall of painting bump thenconverted(EB) in PTC-Orbitcoordinates: • Small differences in bucketshape and residual phase offset  produceartificiallosses in the code of ~12% Needsoptimization

  7. Isolde likebeam(2/4) E* (um) RED: ceramic GREEN: inconel, no compensation BLUE: inconel Horizontal Vertical Np=1000e10 Qh=4.28, Qv=4.55 turns • Horizontal emittance dominated by losses

  8. Isolde likebeam(3/4) RED: ceramic GREEN: inconel, no compensation BLUE: inconel Np) Np=1000e10 Qh=4.28, Qv=4.55 turns • >12% losses, mostlyartificial, due to non-perfectRF capture  relative is OK!

  9. Isolde likebeam(4/4) Uncapturedbeam, lost on the innerside of the vacuum chamber y (mm) Vertical losses RED: ceramic GREEN: inconel, no compensation BLUE: inconel X (mm) • >12% losses, mostlyartificial, due to non-perfectRF capture

  10. PSB Space-Charge activities ongoing • Code consolidation (Highest priority! within SC study-group) • Injection chicane (discussed in Friday’s Injection meetings) • Add quadrupolar component in the BSW1 model • Optimum shape for bump decay • Benchmark with 160 MeV measurements (part of V.Forte’s Thesis) • Add alignment & quads errors (V. Forte, with input from M. McAteer) • High intensity beams: set-up PTC-Orbit simulations (past work done with Orbit) and losses localization (M. Kowalska, TS starting next week) • Evaluate impact of new H- injection @ 160MeV • LHC beams: Find optimum WP for max brightness, Effect of integer, resonance compensation, machine model • Losses & halo for high intensities/large emittance

  11. Conclusions: inconel vs. ceramic ? • Confirmedconclusions of presentation30/5/13: (http://indico.cern.ch/conferenceDisplay.py?confId=254489) for the beams of interest • No showstoppersfor the inconel chamber are found, but compensation isrequired • Simulations results are validonly in relative, to discriminatebetweenceramic and inconel chamber • optics model as simple as possible, • no errorsexcept in BSW magnets • A documentis in preparation

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