LHC Performance Workshop 2017

Chamonix - Les Aiglons

Chamonix - Les Aiglons


The LHC Performance Workshop (Chamonix 2017) will take place from 23 to 26 January 2017 in Hotel Les Aiglons in Chamonix.

Chair : Frédérick Bordry
Scientific Secretaries:  Benoît Delille, Markus Zerlauth

Attendance is by invitation only.

A summing-up session will take place at CERN Main Auditorium on 1st March 2017 p.m. (date to be confirmed).

Please register before 12 December.


    • 08:30 08:45
    • 08:45 12:30
      Session 1: Lessons from 2016

      This session will cover the conclusions/recommendations from Evian and the lessons learnt from the 2016 run

      Conveners: Matteo Solfaroli Camillocci (Chair) , Roderik Bruce (Scientific Secretary)
      • 08:45
        2016 operation: Operational efficiency and lessons learnt 20m
        • Nominal cycle: how did we do it? What can we improve? Turnaround (vs fill length)
        • CRS, how much did we gain? Can we push it further?
        • UFOs: why just a few?
        • Operation: are our diagnostic, tools etc appropriate? Information management, can we improve it?
        • Low E precycle, how much did we gain? Can we go further?
        • Special cycles performance and overhead
        Speaker: David Nisbet
      • 09:15
        Beams during the cycle: Quality and behaviour 25m
        • Linear coupling: Lasslet tunes and coupling correction at injection.
        • BCMS vs normal beam
        • E-cloud effect and lesson learnt (was the scrubbing strategy effective?)
        • Coupling, chromaticity and tune: a complex workspace
        • Instabilities, blow-up and lifetime throughout the cycle
        • B1 vs B2: why is B1 systematically suffering more?
        • What about doublet beams?
        • Lessons from MDs
        • Linear coupling: Lasslet tunes and coupling correction at injection.
        • BCMS vs normal beam
        • E-cloud effect and lesson learnt (was the scrubbing strategy effective?)
        • Coupling, chromaticity and tune: a complex workspace
        • Instabilities, blow-up and lifetime throughout the cycle
        • B1 vs B2: why is B1 systematically suffering more?
        • What about doublet beams?
        • Lessons from MDs
        Speaker: Kevin Shing Bruce Li
      • 09:50
        Coffee break 30m
      • 10:20
        Colliding beams: Quality and behaviour 25m
        • Octupoles: do we need them? Burn-off vs losses
        • E-cloud: what is its role in the observed instabilities?
        • Coupling, chromaticity and tune: a complex workspace
        • Beam separation tests: are we comfortable with levelling?
        • Emittance growth
        • Experience with reduced Xing angle: benefits (drawbacks?)
        • Lessons from MDs
        Speaker: Xavier Buffat
      • 10:55
        Machine availability 20m
        • 2016 analysis: main bottlenecks
        • How did it get so high? Key factors?
        • Analysis and comparison with 2015/2012?
        • Is R2E still an issue?
        • QPS can we forget about it?
        • PC FGC lite, a real improvement? Any risks?
        • Dilution kicker erratic: aging or just bad luck?
        • FMCM impact of power supply change, What can we expect for 2017/2018?
        Speaker: Andrea Apollonio
      • 11:25
        Technical infrastructures analysis and perspectives 20m
        • Status of infrastructure
        • How many failures did we have?
        • Is there any main reason?
        • Do we see any increase?
        • What is expected for 2017?
        • Can we reduce the impact of thunderstorms?
        Speaker: Jesper Nielsen
    • 16:15 16:45
      Coffee break 30m
    • 16:45 20:00
      Session 2: System performance
      Conveners: Chiara Bracco (Scientific Secretary) , Mike Lamont (Chair) , Paul Collier (Chair)
      • 16:45
        LBDS and injection kickers: occasional storms 20m
        • Overall system performance
        • Issues (MKI vacuum and sparks during SS, MKB switches, etc.) and proposed mitigation measures. Proposed longer term consolidation.
        • MKI: any expected intensity limitation for 2017 given proposed actions in EYETS
        • MKD-MKB reliability run: main outcomes and observations
        • Perspectives for 2017 and beyond
        • Operation at 7 TeV: increased risk of MKD-MKB erratics? Is this possible to quantify?
        Speaker: Laurent Sylvain Ducimetiere (CERN)
      • 17:15
        Are the electron clouds clearing? 20m
        • What did we learn in 2016
        • Scrubbing 2017: plans depending on available beams from injectors (SPS intensity limitations?)
        • Proposed strategy during the intensity ramp-up 2017
        • Plans for scrubbing with exotic schemes: doublets, 80 bunches
        • Extrapolation into Run 2 and beyond
        Speaker: Giovanni Iadarola
      • 17:45
        Cryogenics: performance 2016 15m
        • Status, measures, availability and reliability
        • Proposed work in EYETS and further potential improvements
        Speaker: Mr. Gerard Ferlin (CERN)
      • 18:10
        Break 15m
      • 18:25
        Cryogenics: perspectives 20m
        • Limitations (triplets/luminosity etc.)
        • Configuration and outlook for 2017
        Speaker: Krzysztof Brodzinski
      • 18:55
        Injectors: bright and improving 20m
        • Performance 2016: Beam quality, brightness etc, improvements deployed (second PS cavity and ghosts reduction, any further improvement possible?) and developments. Emittance through the chain.
        • Availability 2016 & issues (POPS, Linac2 RFQ, etc.); outlook
        • Beam options for 2017 and limitations
        Speaker: Bettina Mikulec (CERN)
      • 19:25
        Perspectives of magnet circuit performance for 2017/18 20m
        • Planned upgrades of powering and protection systems (DYPQ, IT/IPQ protection, FGC lite, redundant 600A power supplies…) + their expected impact
        • Optimising pre-cycle (e.g. longer pre-cycle for 600A correctors to minimise spurious trips due to 0 voltage crossing)
        • Are all circuits ready for operational plans in 2017/18 in terms of ramp-rate and acceleration… (e.g. triplet correctors as part of orbit feedback for different lumi-levelling options, ondulators @ 7TeV, tune feedbacks vs RQTD/F…)
        • R2E perspective when operating >= 1.5x design luminosity in 2017/18
        • Optimising ELQA campaigns and intervention downtimes: Diagnostic tools and capabilities, earth monitoring systems, …
        • Future perspectives: Development of didt sensors, circuit separators
        Speaker: Reiner Denz (CERN)
    • 08:30 12:00
      Session 3: Operation performance optimization for run 2
      • The sessions will cover operation and hardware performance challenges for 2017 and 2018. Topics to be presented include:
        o Running conditions and key challenges for 2017 and 2018 operation, pushing (the limits) towards nominal conditions/parameters. It includes special runs, choice of optics …;
        o LHC and injectors hardware performance: Status on current performance and 2016 limitations, improvements for 2017 and 2018, impact of operational parameters on HW performance. The situation of TIDVG and injection kickers will be reviewed in these sessions. The TIDVG change decision will be taken before Chamonix workshop (LMC 2nd November)
      Conveners: Laurette Ponce (Scientific Secretary) , Mike Lamont (Chair) , Paul Collier (Chair)
      • 08:30
        Experimental requirements in 2017 20m
        • The talk discusses the input from the experiments that is relevant to define next year's program. It covers the target for integrated luminosity for 2017 and the requests for special runs (high beta*, VdM scans, high or low pile-up runs…). The impact of LHC parameters and conditions on the experiments is also discussed, including the effect of pile-up, beam energy, bunch length, background, etc.. In addition the need and different possibilities for luminosity levelling in ATLAS/CMS will be discussed, as well as feedback on the observed luminosity difference between ATLAS/CMS in 2016 running.
        Speaker: Jamie Boyd (CERN)
      • 09:00
        Baseline optics for 2017 and beyond 20m

        A review of the possible optics configurations for the 2017 LHC run will be made. The two candidates, i.e., the nominal and the ATS optics will be compared in order to assess pros and cons of each option. Main aspects considered will be: chromatic properties, collimation and machine protection, flexibility to accommodate requests from forward physics, and efficiency in terms of squeeze time. An overview of longer-term developments will be outlined.

        Speaker: Massimo Giovannozzi (CERN)
      • 09:30
        Levelling options (if needed) 20m

        This talk will look at different options for luminosity levelling for 2017, namely levelling by
        separation, by beta* and by crossing angle. The current experience from regular operation and
        MD will be recalled for each levelling technique. The implications on operation of each method
        will be discussed and the the pros and cons will be presented. The state of readiness and the
        effort to make each method operational will be quantified. As a conclusion, a recommendation
        for a lumi-levelling roadmap will be presented.

        Speaker: Kajetan Fuchsberger (CERN)
      • 10:00
        Coffee break 30m
      • 10:30
        MD priorities for Run 2 20m

        LHC has reached the equator of Run 2 with an impressive performance beyond design, mostly thanks to smaller beam emittances, smaller beta* and an excellent machine efficiency. MD results anticipate that there is room to continue pushing the machine performance throughout Run 2.
        In addition to this, the upcoming machine upgrades, LIU and HL-LHC, set new challenges that require dedicated exploration to anticipate potential obstacles. Potential MDs for Run 2 and their priorities are discussed.

        Speaker: Rogelio Tomas Garcia (CERN)
      • 11:00
        Putting it together: Machine configuration for 2017 20m
        • Compare BCMS performance with nominal – advantages, constraints and reach.
        • Optics choice, Beta* options & crossing angle
        • Which configuration is likely to give us the best availability?
        • Luminosity predictions
        Speaker: Mike Lamont (CERN)
    • 16:15 16:45
      Coffee break 30m
    • 16:45 20:25
      Session 4: Full energy exploitation
      • This session will review the limits in terms of energy, intensity and availability. It can include the following:
        o Magnets training;
        o Magnets operating at + 110A;
        o Quench margins;
        o BLM thresholds;
        o Availability/Reliability at 7teV and beyond, sensitivity analysis;
      Conveners: Andrea Apollonio (Scientific Secretary) , Oliver Bruning (Chair)
      • 16:45
        Summary of the LHC dipole magnet performance on the test benches including data from 2008 to 2016 20m
        • Statistical summary, what can we learn / conclude from these training campaigns (in preparation and contrast to the experience from the training in the tunnel), observed faults and problems with statistical summary.
        Speaker: Gerard Willering
      • 17:15
        Summary of the training campaigns and magnet quenches in the tunnel 20m
        • How many campaigns did we conduct, how long were the campaigns, what were the average, best and worst cryo recovery times during the training, how many multiple quenches did we observe during the campaigns, what were the main obstacles, observations and features of the campaigns including fault summaries and system limitations (e.g. RD3.L4), other quench observations in the machine during operation and lessons learned from these, risk assessment / extrapolation for training the rest of the machine to 7 TeV
        Speaker: Sandrine Le Naour
      • 17:45
        What to do if we detect a short-circuit during training? Actions 15m
        • How often do we think we can expect such events in the future for further training and how much time do we need to schedule for each use of the Fault Burner for future applications during upcoming training campaigns?
        • What do we need to prepare in order to have this tool truly operational for future applications (spare board, more than one board, clearly defined and standardised procedures [e.g. X-rays] and automated data recording, etc)
        Speaker: Mateusz Jakub Bednarek (CERN)
      • 18:10
        Break 15m
      • 18:25
        Statistical summary and interpretation of the training campaigns 20m
        • First quenches and second quenches for production line, correlation between individual test and commissioning campaigns, correlation to production features, expected training time for the rest of the machine for operation at 7 TeV before LS2, expected training time for operation at 7 TeV after LS2 (after a full thermal cycle of most - all but perhaps one - sectors), estimate / prediction of recovery time in the different sectors in case we need to exchange a magnet and perform a full thermal cycle in a given sector.
        Speaker: Ezio Todesco
      • 18:55
        Summary of equipment components that might limit the choice of beam parameters and performance reach for operation at 7 TeV 15m
        • e.g. magnets with faults, known non-conformities in the LHC with impact on the beam energy [e.g. beam dump and abort kicker], vacuum equipment [heating] and beam instrumentation, magnets with training and powering limits etc.
        Speaker: Mirko Pojer
      • 19:20
        Expected impact of 7 TeV operation on LHC availability 15m
        • Overview of the expected / projected machine availability for 7 TeV operation, based on 2016 experience. Review of the impact of energy increase on individual system performance and identification of possible running scenarios / timeline."
        Speakers: Andrea Apollonio , Anton Lechner
      • 19:45
        Potential performance reach (instantaneous and integrated, based on the presentations 1 to 5) 15m
        • As we agreed to take as a working hypothesis operation with the same beam and optics parameters as in 2016 (except for an increase of the number of bunches without the dump limitations), the emphasis should be on the planning and training aspects to estimate the effective number of days for physics production at higher beam energy.
        Speaker: Gianluigi Arduini
    • 08:30 13:00
      Session 7: LIU / HL-LHC / LS2

      HL-LHC talks

      Conveners: Daniel Wollmann (Scientific secretary) , Lucio Rossi (Chair)
      • 08:30
        HL-LHC: performance sensitivity to parameters change 20m
        • Xing angle, levelling mode, bunch parameters and spacing, use of virtual luminosity
        • Impact of experience 2016: luminosity lifetime, blow-up, impact of that on estimated performance
        • Availability
        Speaker: Yannis Papaphilippou
      • 09:00
        Can we simplify the correctors and magnet circuits for HL-LHC? 20m
        • Minimum correction strength and circuits required for the MS and IT regions, based on LHC experience
        • Q5 in point 6: can we operate it at 4.5 K in both side? What do we risk?
        • Main sextupole in Q10: still needed?
        Speaker: Riccardo De Maria
      • 09:30
        Review of the present non-conformities in view of HL-LHC 20m
        • Performance reach with and without consolidation of the existing non-conformities in the LHC and potential changes in the wake of the HL-LHC re-baselining (Q4 correctors, half CC, reduced DS collimators etc.).
        • What is mandatory to fix and what we can accept?
        • Robustness to possible additional non-conformities
        Speaker: Massimo Giovannozzi
      • 10:00
        Coffee break 30m
      • 10:30
        Vibration: is it still an issue? 20m
        • What we know now: analysis of experiment
        • Do CE work interfere, still?
        • Will cultural noise be a problem in the HL-LHC
        Speaker: Paolo Fessia
      • 11:00
        Need for beam halo depletion in the HL-LHC and LIU era 20m
        • Machine protection and Crab Cavity operation
        • Loss spikes and lifetime drops
        • Cultural noise in the HL-LHC era
        • Outcome of the hollow e-lens review
        Speaker: Stefano Redaelli
      • 11:30
        Collimation: is this a limitation, still? 20m
        • What have we learned in 2016 and how this affects HL-LHC collimation design?
        • Do we need low impedance collimator?
        • Can the cleaning system stay the same with minimal change?
        • Roadmap to crystals as alternative/complementary device to DS collimators for ion operation
        Speaker: Roderik Bruce
    • 14:00 17:55
      Session 8: LS2 Talks

      LS2 talks

      Conveners: Jean-Philippe Tock (Scientific Secretary) , Jose Miguel Jimenez (Chairman)
      • 14:00
        Introduction 5m
        Speaker: Jose Miguel Jimenez (CERN)
      • 14:10
        Plan tool - status and next steps 20m
        • Feedback from Plan Tool: the plan requests and their status will be presented and statistics will be given. A preliminary version of the next milestones for plan will be presented, highlighting the process of validation of interfaces between activities and groups.
        Speaker: Katy Foraz (CERN)
      • 14:40
        Planning of injectors in (E)YETS and LS2 (LIU, CONS and maintenance) 20m
        • The baseline LIU installation activities corresponding to both ion and proton upgrades will be reviewed to show-up changes approved and/or proposed with respect to Chamonix 2016 baseline. An advanced draft schedule of LIU activities will be presented, underlining the corresponding support needed from the various CERN groups together with the required technical expertise. The main show stopper will be presented.
        Speaker: Julie Coupard
      • 15:10
        Planning of LHC in (E)YETS and LS2 (HL-LHC, CONS and LHC maintenance, non-conformities) 25m
        • The baseline frameworks of YETS 2017-2018 and LS2 including the major activities, will be reviewed, to show-up changes approved and/or proposed with respect to Chamonix 2016 baseline.
          An overview of the activities related to HL-LHC, Consolidation and Maintenance, to be implemented during LS2 will be given.
        Speaker: Marzia Bernardini (CERN)
      • 15:45
        Coffee break 25m
      • 16:10
        Cryogenics driven change during LS2 20m
        • The reason for the change in Pt 4 will be introduced together with margin design for cryosystem compatible with options in Pt 4. The alternatives and proposal/decision in Pt 4 will be introduced. Based on LHC Run 2 heat load experience, the need to coat also the matching sections in IR2 and IR8 will be reviewed.
        Speaker: Serge Claudet
      • 16:40
        LHC experiments 20m
        • The LHC experiments have planned significant maintenance and upgrade efforts for LS2. ALICE and LHCb will implement major upgrades with important changes to the entire apparatus, while ATLAS and CMS will conclude Phase 1 detector upgrades and start the Phase 2 detector upgrades needed for HL-LHC; also making infrastructure improvements needed to support the intensive Phase 2 detector upgrade programme planned for LS3. The presentation will review the LS2 plans of the experiments and will focus on support activities needed and their status in PLAN.
        Speaker: Ludovico Pontecorvo (CERN)
      • 17:10
        Non-LHC experiments 20m
        • The non-LHC experiments have planned significant maintenance and consolidation efforts. The presentation will review the most relevant activities and will focus on support needed during (E)YETS from the technical sector and status in PLAN.
        Speaker: Markus Brugger (CERN)
      • 17:40
        LHC forward experiments 5m

        An update wrt the presentation done at the LS2 kick-off days (Sep-2015) of the programme for the LHC forward experiments will be given. Il will especially focus on plans for LS2 (and LS3)

        Speaker: Mike Lamont (CERN)
    • 13:30 14:30
      Close-out 1h 60-6-015 - Room Georges Charpak (Room F) (CERN)

      60-6-015 - Room Georges Charpak (Room F)


      Show room on map
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