cerna.gif (1167 bytes) Future Topics of MPP Meetings lhc_logo.gif (4175 bytes)

To be scheduled for discussion:


  • New beta* reconstruction for run3 - J. Wenninger
  • Update of MPP participant list - C. Wiesner
  • Follow-ups from MPP workshop (part 1) - D. Wollmann
  • AOB


  • LHC - BCCM status, thresholds and PM - M. Gasior - invitees: Tom, Thibaut and Stephen Jackson
  • AOB


  • TDE interventions during LS2 and impact on interlocks - M. Calviani
  • Proposal for orbit interlocking in Run3 - J. Wenninger
  • AOB

Topics for 2019

  • New SMP flag for allowed beam intensity off SPS-TED: implementation, testing and commissioning requirements (2020)
  • Interlocked BPMs in IR6 - status of new development and proposed implementation of a prototype for the re-start after LS2 - M. Wendt
  • Effect of spurious firing of HL-LHC triplet quench protection (QH and CLIQ) on beam - B. Lindstrom
  • BCCM: MPP input for specification to BI - MPP (by end MAY)
  • Interlocking of new SPS dump (TIDVG) - flow meters for water and air to be interlocked via SIS?! / Temperature sensors and LVDT no interlocking? - A.Perillo Marcone / F. Follin
  • Overview of 10 Hz events observed during run 2 - A. Lechner / J. Wenninger
  • AOB: measured interlocking delay in case of powering failure in Beam-Beam Long-Range (BBLR) compensator PC - B. Lindstrom et al
  • Follow-up: Plans of using Beam-Beam Long-Range (BBLR) compensators in B1 and B2 during high intensity operation - impact on interlocking and protection strategy - A. Rossi
  • Injection incident following high beta run with crystal collimators - S. Redaelli
  • LMC action: Review operability of all moveable devices in the LHC - MPP
  • SPS and TL BLMs, gain setting pbm - analysis and mitigation - E.Effinger, C.Zamantzas
  • New design of interlocked BPMs in IR6 - status of development and proposed implementation of a prototype for the re-start after LS2 - M. Wendt
  • New interlock on SPS timing system (watchdog replacement) for beam dump, BLM and main power supplies - G. Kruk - end March?
  • SPS -BLMs: present configuration, changes to be conform and estimate of investment required (BE-BI) - March 2018
  • SPS -BLMs: non-conformities and investment for additional connections (TE-MPE) - March 2018
  • SPS -BLMs: how present BLMs are used in the SPS / threshold changes and possible damage if BLM interlock does not work (BE-OP) - March 2018
  • New architecture for the SPS injection BIS and impact of SPS beam dump upgrade on BIS and WIC - I. Romera --> end Febr.
  • Exercising of all BIS inputs (C.Martin)
  • Safe software development for operatinal systems, including testing in general purpose network, use of MPE interlock test bed etc. - L. Sero / M. Zerlauth / J.C. Garnier / K. Fuchsberger - tbc
  • BCCM development: status and plans - T. Lefevre, M. Gasior--> mid 2018
  • Persistence of trimable SMP parameters (SPS & LHC) - I. Romera, J.C. Garnier
  • Status of IQC and future development ( Injection diamonds, ... ) - M. Pojer
  • True redundancy of BIS power supplies (problem with primary side faults), e.g. event in IR6 - Redundant supplies for trigger delay boxes - BIS team
  • Update of operational procedure in case of non working dump - M. Solfaroli - tbc
  • (Modifications to the existing BLM electronics during LS2 - status and plans - C. Zamantzas)
  • (Coherence of Exp. BCM and sourrounding BLM thresholds - A. Lechne)r
  • (MP relevant External conditions and possible implementation in BIS? - J.C. Bau et al --> Markus?)
  • (Summary of accidential high intensity beam impacting in ISOLDE, mitigations and possible interlock - NN --> Markus?)
  • (Intensity based interlocking of SPS extractions (AWAKE vs FT & LHC,...) - V. Kain et al)
  • BLM thresholds - after LS2: flattening out of BLM thresholds in long running sums for all energy levels above 450 GeV - A. Lechner --> mid 2019

Follow-up topics from Machine Protection Workshop 2019

Decision mandatory before restart of LS2

Decision mandatory before restart of LS2



  • Define minimal acceptable phase advance values MKD-TCT & MKD-TCDQ

C. Bracco

R. Bruce

see minutes from 183rd MPP (18.10.2019); Chiara to trigger discussion with S. Fartouk, Collimation and MP colleagues
  • Define strategy for TCDQ/TCT/XRP position thresholds and redundant limits (BETS, beat* & energy limits) and movements during collide and squeeze with beta* levelling

Coll & OP

  • Evaluate if asymmetric BETS limits are required

C. Bracco

not possible, but achievable with offset - see minutes 183rd MPP (18.10.2019)
  • Define/clarify damage limits of all concerned accelerator materials for asynchronous beam dump case


  • BLMs: Define procedure to early commission injection interlock inhibit

C. Zamantzas, B. Salvachua

  • BPMs: Define strategy how to start with prototype BPMs system in IR6


  • DOROS BPMs for collimators in IR7: Define how many DOROS systems for Collimator BPMs require interlocking in Run3 (+ tolerances)


  • Evaluate interlocks and SIS checks in case of use of dedicated beam processes for TL collimator jaw positions, TL and SPS optics to allow frequent switching


  • Evaluate potential deployment of TL steering with full trains or the use of two 12 bunch trains in dedicated filling schemes


  • QPS: Define the extent and necessary mitigation actions for the reduction of operational 600A EE units in the LHC for Run 3


to be presented in LMC
  • QPS: Identify most critical IPQs and QXF for implementation of DiDt sensor for improved symmetric quench protection


  • BBLR wire:
  • discuss operational use cases;
  • Define required controls changes;
  • Define interlocking strategy;
  • Finalize tests on interlock delays with FGC2


  • ADT:
  • Define minimum revalidation requirement for changes in ADT (--> mainly for MDs) and account for this in (MD) planning
  • Define responsibilities for protection unlocking

D. Valuch

  • Define and specify future method for beta* re-construction, otherwise redundant interlocking on collimator gaps is not possible

J. Wenninger

See presentation by J. Wenninger 181st MPP (21.09.2019)
  • MPP:
  • Propose template for major event reports
  • Study feasibility of using online tool for regular check lists


  • OP: Evaluate the effects of removal from rarely used beam modes

J. Wenninger

See 110th LBOC (24.09.2019)
  • XRPs:
  • AFP: test of additional cooling & installation additional springs
  • ALFA: mitigate LVDT issues


  • LHCb:
  • Ensure that manual velo retraction is always possible
  • SB@450 GeV: verify if an aperture of 8 sigma, when closing the velo at 450 GeV is allowing a safe and stable operation
  • Document and review functional spec of new CO2 cooling system for LHCb velo, review safety of new velo movement system and describe failure scenarios and consequences
  • Evaluate possibility to close velo (stable beams) at 450 GeV


  • SPS:
  • BPM: Clarify how current interlock on the SPS extraction bump, implemented in the MOPOS front-end, will be transferred to the new ALPS system
  • Prepare proposal for improved interlocking of slow extraction and MDs

  • Linac4: Discuss threshold management and investigate/prepare appropriate tools

Necessary for luminosity production

  • tbc

Beneficial for long term operation

  • tbc

Topics for 1/2 day workshop on HL-LHC Machine Protection

  • Fast failures for HL-LHC - D. Wollmann / M. Valette
  • Effect of D1, Q4, Q5 powering failures on orbit - M. Valette / B. Linstrom - tbc
  • MP failure case matrix for crab cavities after baseline change
  • SPS CC failure cases and their criticality - B. Lindstrom / M. Valette
  • SPS CC planned machine protection tests - B. Lindstrom / M. Valette
  • HL-LHC: effect of spurious quench hetaer and CLIQ firing on beam and need of beam interlock - M. Valette


  • New BLM electronics - specifications, status and plans - C. Zamantzas (major upgrade of BLM electronics postpone to LS3)
  • HL-LHC MP: Halo supervision, possibilities/requirements for diagnostics, plans & outlook (BI)
  • (CMS BCM thresholds comparison with LHC BLMs (EDMS Doc. Nr 1502426) - M.Guthoff)
  • (New logic for collimator temperature interlock logic (check gradients, check consistency of different two beams) - A. Masi )
  • Remote monitoring for beam presence in the CCC (I. Romera)
  • Additional running sum in BLM PM data
  • (Ion/Proton interlock for SPS extraction (comment from M.Lamont - might be part of new SPS QC?!) --> Markus?)
  • (SW change procedure (tracking changes in MPS and SW components) --> Markus?)
  • (SPS extraction interlock (follow-up with timing and SPS OP) --> Markus?)


Last updated 22-Nov-2019 11:18