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• Key decisions to be made

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

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Planned baseline upgrades

• Double the power of 200 MHz RF system (LSS3, BA/BB3);• Power and low-level control upgrade of 800 MHz RF system• 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;

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

• Improved electrostatic 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

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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 DQv above present -0.18 (2012) towards -0.2 for 50 ns beam

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SPS DQ = -0.18

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 aC coating 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)

LIU-SPS LS1 work – II (BI)• DC BCTs: new BCT in 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 BPMs being 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

BWS prototype

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

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