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SPS : overview, LS1 shutdown work, and perspectives

SPS : overview, LS1 shutdown work, and perspectives. B.Goddard and E.Shaposhnikova on behalf of the LIU-SPS team, who are too numerous to mention individually!. Contents. Reminder of the challenges for SPS Baseline and outcome of recent reviews LS1 activities and changes for LHC Run 2

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SPS : overview, LS1 shutdown work, and perspectives

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  1. SPS: overview, LS1 shutdown work, and perspectives B.Goddardand E.Shaposhnikova on behalf of the LIU-SPS team, who are too numerous to mention individually!

  2. Contents • Reminder of the challenges for SPS • Baseline and outcome of recent reviews • LS1 activities and changes for LHC Run 2 • Key decisions to be made

  3. Extracted from SPS • Requirement: taking into account LHC losses and blowup • 2.2×1011 p+/b in 2.3 mm at 25 ns • 3.6×1011 p+/b in 2.7 mm at 50 ns 2012 2012 2012 BCMS 2012 BCMS

  4. Planned baseline upgrades • Double the power of 200 MHz RF system (LSS3, BA/BB3); • Power and low-level control upgrade of 800 MHz RFsystem • Electron cloud mitigation – in-situ aC coating of all dipole and quadrupole vacuum chambers if needed; • Deployment of low gamma-transition “Q20” optics (done) • Major Improvement of beam size, orbit and loss monitoring, plus other new or upgraded BI systems; • Upgraded transverse damper electronics and new pickups; • New High Bandwidth transverse feedback system; • Upgraded passive protection devices in extractions and TI2/TI8; • Improved vacuum sectorisation – arcs and near critical equipment; • Complete impedance reduction of MKE and dump kickers; • Upgrade of magnet interlocking systems;

  5. Reviewed upgrade options • New transverse beam tail scraper system • 21/01/2013 Review : keep present system, finish magnetic bump scraper TDR • Improvements or replacement of beam dump system • 07/02/2013 Review : urgent to propose TIDVG block upgrade, also study external dump on existing beamline • New low-impedance extraction kickers • 19/03/2013 Review : present MKE kickers should be acceptable, investigate reducing number installed. Investigate MKP heating • Improvedelectrostatic septa • 12/03/2013 Review : improvements in circuit to prototype • New high energy orbit correction system • 08/02/2013 Review : new HW not needed, study using existing bumpers for high energy correction • New faster injection kickers (for ions) – to organise • New collimation system – to organise

  6. Expected situation after upgrade • If all upgrades work as planned, SPS machine well matched to requirements • SPS should not be a limit for 25 ns beam for HL-LHC • Need to push DQvabove present -0.18 (2012) towards -0.2 for 50 ns beam SPS DQ = -0.18 ?

  7. LIU-SPS LS1 work - I • Finish 800 MHz power and low-level control upgrade • Improve Vacuum sectorisation in LSS1, around TIDVG and MKDV/H • Impedance shielding of MKQH/V and MKDV • Installation of final serigraphed MKE in LSS4 • Configuration of MDHD.11832 for injection dogleg correction • Deploy aCcoating on additional 12 dipoles and 4 quadrupoles in LSS5 (to give 4 complete half-cells) • New transverse damper pickups, plus upgrade of low-level • Installation of cables, kicker and pickups for high bandwidth damper • Preparation in LSS3 for 200 MHz upgrade • Re-alignment of sextant 5-6 • Upgrade of magnet interlocking system (WIC)

  8. LIU-SPS LS1 work – II (BI) BWS prototype • DC BCTs: new BCTin LSS5 for NA61 interlock • Fast Ring BCT: investigate detector and electronics upgrade • Fast BLMs: new electronics for detectors in LSS4 and LSS6 • Orbit and trajectory: • Separate pick-ups for BE/RF damper in LSS2 • BA5 equipped with parallel BPM system (fibres, new electronics) • Radiation (electronics) issue on TT10 BPMsbeing looked into (shielding) • BSRT: upgrade detector/electronics for beam size at >300GeV • BGI: upgrade detector/electronics for continuous beam size • Tune: new electronics and SW for bunch gated measurement • BWS: • Remaining scanners being consolidated • Detector prototype installed in LSS5 with new electronics for testing

  9. Key decisions still to be made • aC coating or scrubbing? • Needs experience in scrubbing after LS1 • 50 ns rise time ion injection kicker system? • Aperture, impedance, cost • Reduce number of MKE to help long. stability? • Studies needed, and beam tests

  10. Conclusions • Huge progress has been made in the past years • A lot of interesting work is still ahead of us! • Thanks to all the teams, for the excellent results and great collaboration

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