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Report from LIU-SPS

This report provides an overview of technical issues related to the assumed deliverables, baseline hardware upgrades, design studies, and key activities in 2011. It also discusses the planned milestones and addresses various technical challenges and issues that need to be resolved.

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Report from LIU-SPS

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  1. Report from LIU-SPS B.Goddard “dedicated to technical issues”

  2. Overview • Assumed deliverables • Baseline HW upgrades • Design studies and decision points • Assumed milestones and planning • Technical issues • Key 2011 activities

  3. Assumed deliverables • For 2011/12 • LHC nominal beam ready for all spacings • Studies with nominal emittance, ultimate intensity • Studies with small emittance, nominal intensity • For 2014 startup (after LS1) • Ultimate intensity, nominal emittance with 50 ns and 75 ns beams • Studies with lower emittances/ultimate intensity • For 2018 startup • Ultimate intensities and 2.5 um emittance for 50 and 75 ns beams • Ultimate intensities and nominal emittance for 25 ns beam • Studies with lower emittances/higher intensity

  4. Baseline HW upgrades • MKE impedance reduction: completed for 2012 • Existing damper power upgrade: completed for 2014 • Beam instrumentation upgrades: completed for 2014 • Scraper upgrade: completed for 2014 • Extraction and TL protection upgrade: completed for 2014 • MKDV/H impedance reduction (transitions): completed for 2014 • New high bandwidth damper: completed for 2016 • RF 200 MHz upgrade: completed for 2018 • ecloud mitigation: aC coating, completed for 2018

  5. Design studies and decision points • Beam dump design study: completed end 2013 • New MKE design study: completed end 2013 • Collimation design study: completed end 2013

  6. Assumed constraints and planning • Constraints (working assumptions) • LHC LS1 in 2013, for ~15 months • LHC LS2 in 2017, for ~15 months • LHC injectors OFF in 2013, for ~14 months • LHC injectors OFF in 2017, for ~6 months

  7. Planning - provisional 200 MHz RF aC coating Wide bandwith FB High power damper Beam instrumentation Scraper

  8. Planning - provisional Beam dump design Beam dump upgrade Extraction and TL protection devices MKE impendance reduction MKE design study Extraction upgrade

  9. Key 2011 activities • Launch 200 MHz upgrade [OK – review finished] • Technical decision mid 2011, civil engineering studies [to do] • Preparation for coating (4 half-cells, 1 sextant?) of SPS, or for clearing electrodes, or both? [OK – aC only, 1 electrode prototype] • Decide on quadrupoles, pumping ports, other elements [to do] • Big impact if long shutdown is moved to 2013 – more possible [OK] • High bandwidth feedback: studies, design report (LARP) [to do] • Define all additional BI upgrade requirements [OK – in progress] • Prepare 2 of final 3 MKE with serigraphy [OK – in progress] • Problem if 2011/2012 shutdown less than 10 weeks [OK] • Launch full feasibility study for new MKE [to do] • Including impedance calculations and benefit analysis • Key MDs defined for 2011? [OK – defined] • Additional points (since LIU day): • Existing damper upgrade: requirements needed • Scraper upgrade and collimation: requirements needed • Beam dump upgrade: requirements needed • Machine protection and beam transfer: requirements needed • Operational limitations: review and make sure all are being addressed

  10. Technical issues to address • Clearing electrodes • Aperture, impedance and technical challenges to investigate • Resources to develop a prototype before end 2011 – feeding back requirements from impedance and aperture... • Instrumentation to demonstrate clearing electrodes work...? • aC feasibility questions to be answered in 2011 • Explanation for dynamic pressure rise, if ecloud is suppressed • Confidence in lifetime, handling etc. • Need for coating quadrupoles, LSS, SSS, ... • Definition of other precautions (extra sectorisation, ...) • Beam induced heating/outgassing of components limitation for high duty factor MD cycles • MKE serigraphy to complete – should help (although new MKE4 limited 25 ns) • General impedance reduction effort to be reviewed (other kickers, other elements, enameled flanges, )

  11. Technical issues to address • Beam instrumentation • Dynamic ranges, bunch by bunch, ... are presently foreseen upgrades/new instruments sufficient for all requirements for LIU? • Preparing a half-day review of this with BI plus experts in near future • Limitations for MDs • Outgassing of TIDV affecting MKP (was solved for CNGS) • Dumping beams at 37-105 GeV impossible – is this required? • Check workarounds for all cases: strong impact on dump upgrade. • Beam losses • Quantify level where ‘general’ beam loss become intolerable (RP, equipment lifetime, extracted intensity, …) • Do we really need dedicated collimation to localize losses? • Combine scraper with collimation system?

  12. Technical issues to address • Exit windows and TEDs • Intensity/transverse emittance limits to be defined (I, e) • 800 MHz low level (addition of 1 turn feedback) • ‘White paper’ activity - highest priority for RF • Should be integrated into LIU – priorities and resources to discuss • 200 MHz LL upgrade • Careful coordination with 200 MHz rearrangement • Possible to stage the deployment – maybe preferred before LS2

  13. MD for 2011 • LIU-SPS MD is ~204 hours • Total SPS MD estimated at ~336 hours • 434 hours maximum available (floating + dedicated)

  14. MD priorities for 2011 – “beam dynamics” • Re-establish low loss nominal 25 ns beam, reference measurements for ecloud • Low gt studies – feasibility, multibunch, RF limits, working point, ecloud, ... • Limitations of achievable “above nominal” intensity beams, increase of intensity in steps with time for optimization (50 and 25 ns beams) • Transverse emittance preservation • Electron cloud dependence on bunch current and emittances • Impedance identification + reference measurements (transverse + HOM longitudinal) • TMCI threshold in double RF system and multibunch behaviour • Double RF system (stability and emittance blowup) with nominal LHC beam

  15. MD priorities for 2011 – “ecloud” • Measure / estimate accumulation of surviving electrons using SPS ecloud diagnostics • Tests for a wide band feedback system against electron cloud instabiliLes or TMCI (with LARP)

  16. MD priorities for 2011 – “BI” • Wire scanners: calibration and improvements • Fast BCT: bandwidth and filling patterns/intensity effects • BGI (transverse) and BSRT (longitudinal) testing • LHCBPMs: improved optics measurements • Headtail monitor attenuator improvements

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