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Recent Developments in PS MDs and LHC Beam Optics Studies

This report outlines recent studies and preparations related to PS MDs, focusing on LHC beam optics at 26 GeV/c. Key topics include preliminary investigations on injection errors with single and double batch systems, new matching for FTA(AD) lines, and profiling tests. Noteworthy advancements in optics to enhance emittance preservation are highlighted, alongside ongoing preparations for SPS MDs and tests at various energies. The results aim to optimize beam performance in high-intensity scenarios and ensure readiness for future measurements.

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Recent Developments in PS MDs and LHC Beam Optics Studies

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  1. Some recent PS MD’s • LHC beam • TOF (see Gabriel Metral talk) • AD (see Roland Garoby talk) • Optics @ 26 GeV/c • PSB-PS matching • Profilometer tests • SPS-MD’s preparation R. Cappi PPC 15.10.99

  2. LHC beam • Single batch (4 bunches): • preliminary studies of injection errors on various bunches / rings: • ax ~1.5mm => Dex ~0.16 mm => 8% of b.u. • ay ~ 3mm => Dey ~0.65 mm =>32% of b.u. • Double batch (4+4 bunches): • almost all HW modifications done • ready (?) to start measurements with beam R. Cappi PPC 15.10.99

  3. Optics @ 26 GeV/c • PS and TT2 • closed orbit minimisation => done • new matching for FTA(AD) line =>done • optic meas. With TT10 => analysis in progress R. Cappi PPC 15.10.99

  4. PSB-PS matching • New BTP transfer line optic: • Problems with: • Pow. Supplies controls • Instrumentation (WS) • coupling effects, etc. • “...the new optic is better than (or at least 'as good' as) the old for emittance preservations of small emittance beams…(A.Jansson dixit) • a suivre (tests on high intensity beam, LHC beam, etc.)... • Quadr. p.u. measurements: • in progress, (see next PPC) R. Cappi PPC 15.10.99

  5. New profilometer tests • Test with beams at various energies: • 1.4, 3.5, 26 GeV • other energies in preparation • incompatible with ion beams (stripping by vacuum bump) • tests will continue on last MD (before Xmas) R. Cappi PPC 15.10.99

  6. SPS-MD’s preparation • TSTLHC: “nominal” LHC beam • MDPRO:fast extr. @ 14GeV/c • MESPS:single bunch (long or short) @ 26GeV/c, various intensities • MDSPS: bunch train at 26GeV/c • etc. • in preparation: single bunch @ 20 GeV/c R. Cappi PPC 15.10.99

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