LHC Beam Operation workshop - Evian 2011

Europe/Zurich
Royal Hotel

Royal Hotel

Evian-les-Bains
Mike LAMONT
Description


 

The LHC Beam Operation workshop will be held on 12, 13 and 14 December 2011 in the Royal Hotel in EVIAN (74), France.

Attendance is by invitation only.

                                                                                                                                                                           

The principle aims of the workshop are to review 2011 LHC beam commissioning and beam operations experience, and to look forward to the operation of the LHC in 2012.

Issues addressed will cover: operation from injection to stable beams and possible improvements; analysis of availability and premature dump; problems encountered and possible improvements; and the performance of the machine protection system and other accelerator systems.

The operations plan for 2012 will be presented and discussions will address the strategies for luminosity delivery and machine development priorities.

                                                                                                                                                                            

Chairman Mike LAMONT
Scientific Secretary Malika MEDDAHI
Editors of the Proceedings Brennan GODDARD, Sylvia DUBOURG
Informatics & infrastructure support Pierre CHARRUE
Workshop Secretary  Sylvia DUBOURG
Participants
  • Adriana Rossi
  • Alick Macpherson
  • Anders Ryd
  • Andrzej Siemko
  • Andy Butterworth
  • Annika Nordt
  • Belen Maria Salvachua Ferrando
  • Benedetto Gorini
  • Benjamin Todd
  • Benoit Salvant
  • Bernd Dehning
  • Bernhard Holzer
  • Brennan Goddard
  • Bruno Puccio
  • Burkhard Schmidt
  • Chiara Bracco
  • Christos Zamantzas
  • Daniel Deboy
  • Daniel Valuch
  • Daniel Wollmann
  • Delphine Jacquet
  • Django Manglunki
  • Eduardo Nebot Del Busto
  • Elena Chapochnikova
  • Elias Metral
  • Emilio Meschi
  • Enrico Bravin
  • Eric Veyrunes
  • Etienne Carlier
  • Eugenia Hatziangeli
  • Eva Calvo Giraldo
  • Eva Barbara Holzer
  • Ezio Todesco
  • Fabio Follin
  • Federico Ravotti
  • Federico Roncarolo
  • Florian Burkart
  • Frank Schmidt
  • Frank Zimmermann
  • Gabriel Johannes Mueller
  • Georges Trad
  • Georges-Henry Hemelsoet
  • Ghislain Roy
  • Gianluca Valentino
  • Gianluigi Arduini
  • Giovanni Rumolo
  • Giovanni Spiezia
  • Giulia Papotti
  • Giuseppe Bregliozzi
  • Glenn Vanbavinckhove
  • Grzegorz Kruk
  • Guy Crockford
  • Hannes Bartosik
  • Helmut Burkhardt
  • Jan Uythoven
  • Jean-Jacques Gras
  • John Jowett
  • Jorg Wenninger
  • Jose Miguel Jimenez
  • Kajetan Fuchsberger
  • Karel Cornelis
  • Katarina Sigerud
  • Klaus Hanke
  • Knud Dahlerup-Petersen
  • Lars Jensen
  • Lasse Normann
  • Laurent Jean Tavian
  • Laurette Ponce
  • Lene Norderhaug Drosdal
  • Louis Pereira
  • Luisella Lari
  • Malika Meddahi
  • Marek Gasior
  • Marek Strzelczyk
  • Maria Chamizo Llatas
  • Marija Cauchi
  • Mariusz Gracjan Sapinski
  • Markus Albert
  • Markus Brugger
  • Markus Zerlauth
  • Martin Aleksa
  • Massimiliano Ferro-Luzzi
  • Massimo Giovannozzi
  • Matteo Solfaroli Camillocci
  • Mauro Nonis
  • Michaela Schaumann
  • Mike Barnes
  • Mike Lamont
  • Mirko Pojer
  • Nicolas Mounet
  • Oliver Bruning
  • Paolo Martinengo
  • Peter Sollander
  • Philippe Baudrenghien
  • Pierre Charrue
  • Ralph Steinhagen
  • Ralph Wolfgang Assmann
  • Reine Versteegen
  • Reiner Denz
  • Rende Steerenberg
  • Reyes Alemany Fernandez
  • Rhodri Jones
  • Riccardo De Maria
  • Richard Jacobsson
  • Roderik Bruce
  • Rogelio Tomas Garcia
  • Roger Bailey
  • Ronaldus Suykerbuyk
  • Rossano Giachino
  • Rudiger Schmidt
  • Serge Claudet
  • Simon Baird
  • Simone Gilardoni
  • Stefan Roesler
  • Stefano Redaelli
  • Stephane Cettour Cave
  • Stephane Fartoukh
  • Steven Hancock
  • Themistoklis Mastoridis
  • Thibaut Lefevre
  • Thilo Pauly
  • Tobias Baer
  • Verena Kain
  • Vincent Baglin
  • Vito Baggiolini
  • Walter Venturini Delsolaro
  • Werner Riegler
  • Witold Kozanecki
  • Wolfgang Bartmann
  • Wolfgang Hofle
  • Xavier Buffat
  • Yannis Papaphilippou
Support
    • 10:15 10:45
      Welcome Coffee 30m 6th floor

      6th floor

      Royal Hotel

    • 10:45 11:00
      Opening remarks and setting the scene 15m Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      Speaker: Mike Lamont
      Paper
      Slides
    • 11:00 12:50
      Session 1: Review 2011 Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      Minutes
      • 11:00
        Introduction and review of the year including OP issues 30m
        Speaker: Mirko Pojer
        Paper
        Slides
      • 11:30
        Premature dumps - analysis- number and cost, areas to target 25m
        Speaker: Markus Albert
        Paper
        Slides
      • 11:55
        Availability and statistics - analysis, areas to target + SEUs, improvements in stats and faults collection 25m
        Speaker: Alick Macpherson
        Paper
        Slides
      • 12:20
        Turnaround - analysis, Possible improvements, combined R&S, precycles, injection 30m
        Speaker: Walter Venturini Delsolaro
        Paper
        Slides
    • 12:50 14:00
      Buffet Lunch 1h 10m Grand Salon

      Grand Salon

    • 14:00 15:40
      Session 2 : Availability Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      • 14:00
        QPS - analysis of main problems, areas to target, possible improvements 25m
        The fault statistics of the LHC Quench Protection System QPS for the LHC run 2011 will be presented and the various fault types explained. Starting with teething and EMC related problems, the tune feedback compatibility, hardware faults of the quench heater power supplies and spurious openings of electrical circuit breakers will be described in more details. Hereby as well the necessary and potential consolidation measures will be discussed. The role of the MPE standby service for the system availability will be addressed. Finally radiation induced faults and the respective mitigation and consolidation measures will be treated as separate subject.
        Speaker: Reiner Denz
        Abstract
        Paper
        Slides
      • 14:25
        Cryogenics - analysis, main problems, SEUs, beam related issues 25m
        After recalling the methodology in place, the statistics for LHC cryogenics will be presented for 2011, with analysis of the various origins and overall comparison with 2010. Beam parameters and their effects on operation will be described. Radiation induced effects will be described together with implemented or planned actions, as well as other major actions foreseen for the Xmas break. Perspectives for 2012 will be drawn, with suggestions for possible larger integration of the performance recording methodology.
        Speaker: Serge CLAUDET
        Abstract
        Slides
      • 14:50
        Technical stops: what were the issues in 2011, minimizing impact and improving recovery 25m
        As any other accelerator LHC has to undertake period of stop for maintenance. Five technical stops have been performed during 2011 run and a quite long recovery time has been sometimes experienced. An analysis of the reasons is presented with particular attention to the interventions carried out during the stop. An outlook on the future is also considered to try to increase the LHC availability, diminishing the downtime. The possibility of performing maintenance only once the machine undergoes a problem instead of during planned stops is also analyzed.
        Speaker: Matteo Solfaroli Camillocci
        Abstract
        Paper
        Slides
      • 15:15
        R2E – experience and outlook for 2012 25m
        2011 very successful LHC operation has provided valuable input for the detailed analysis of radiation levels and radiation induced equipment failures. Radiation levels around LHC critical areas and the LHC tunnel were studied in detail and compared to available simulation results, as well as put in perspective to LHC operation parameters. Observed radiation induced failures were not only analyzed in detail, but already addressed through early relocation measures and patch-solution on the equipment level. Both improvements will continue during this xMasBreak together with the installation of heavy shielding around the RBs and UJs in Point-1. Based on measured radiation levels, calculations for the shielding improvements and expected operational parameters this talk provides an update on the expected radiation levels around LHC critical areas. Briefly summarizing the already performed mitigation measures and equipment patches, an estimate is provided on expected equipment failure rates during 2012 operation. Required beam and measurement studies are highlighted in order to further improve the predictions of both radiation levels and expected equipment failures, the latter driving the chosen mitigation actions for LS1.
        Speaker: Giovanni Spiezia
        Abstract
        Paper
        Slides
    • 15:40 16:15
      Coffee Break - Room registration starts 35m 6th floor, Royal Hotel

      6th floor, Royal Hotel

    • 16:15 18:00
      Session 3: Injection Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      paper
      • 16:15
        Transfer lines - stability and optimization 25m
        During the LHC proton run 2011 large drifts, shot-by-shot and even bunch-by-bunch trajectory variations were observed with the consequence of high losses at injection and frequent lengthy trajectory correction campaigns. The different effects will be quantified and an estimate for downtime caused by them in 2011 will be given. The sources of the instabilities, solutions for 2012 and achievable improvements will be discussed. Possible future upgrades (TCDI button BPMs,…) will also be mentioned.
        Speaker: Lene Norderhaug Drosdal
        Paper
        Slides
      • 16:40
        Injection losses and protection, de-bunching, availability, sunglasses 25m
        Injection losses are compared for 2010 and 2011 operation. Mitigation techniques which were put in place in 2010 to reduce losses at injection are described. Issues in 2011 operation, their potential improvements, the experiments' view on beam quality at injection and the performance reach for 2012 are shown.
        Speaker: Wolfgang Bartmann
        Paper
        Slides
      • 17:05
        Beam preparation in injectors & beam characteristics through the injector complex 30m
        Beam parameters such as intensity, bunch intensity distribution, longitudinal emittances, satellite population, transverse emittances and beam tails, require frequent trimming in PSB, CPS and SPS. In 2011, operators on all three machines gained a lot of experience on the preparation of high quality LHC beams. From this experience we can present procedures and scenarios for the preparation of the LHC beams, and for the filling itself. An overview of the different beam parameters, and the tools to measure and control them, will be presented.
        Speaker: Karel Cornelis
        Slides
      • 17:35
        Injection and Dump Systems 25m
        Performance and failures of the LHC injection and extraction system are presented. In particular, comparison with 2010 run, lessons learnt during operation with high intensity beams and foreseen upgrades are described. UFOs, vacuum and impedance problems related to the injection and extraction equipments are analysed together with possible improvements and solutions. New implemented features, diagnostic, acknowledgment, critical issues of XPOC and IQC application are addressed.
        Speaker: Chiara Bracco
    • 19:30 21:00
      Dinner 1h 30m Restaurant La Veranda

      Restaurant La Veranda

      Royal Hotel

    • 08:30 10:10
      Session 4: Operational performance Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      paper
      • 08:30
        Aperture & optics – measurements and conclusions 25m
        In 2011, the LHC has delivered collisions with different optics configurations in the four interaction points. The performance has been pushed during the year until a final configuration with 3 IPs squeezed to 1 m was achieved. Correspondingly, the machine aperture has been measured in the different configurations, at injection and at top energy, to ensure a safe operation in all conditions of beta* and crossing angle configuration. In this paper, the 2011 commissioning experience of LHC optics is reviewed and the results of aperture measurements are presented and compared with the expectations. The measurement requirements for the 2012 operation and possible improvements are also discussed.
        Speaker: Stefano Redaelli
        Paper
        Slides
      • 08:55
        Emittance preservation in LHC: Present understanding, possible improvements/gains, required diagnostics 25m
        Emittance measurements during the LHC proton run 2011 indicated a blow-up of 20 % to 30 % from LHC injection to collisions. At the LHC design stage the total allowed emittance increase from SPS extraction to colliding beams was set to 7 %. This presentation will show the emittance preservation throughout the different parts of the LHC cycle and discuss the current limitations on emittance determination. Possible sources and cures for the observed blow-up will be presented. Possible improvements of emittance diagnostics and analysis tools together with a list of machine development tests in 2012 will also be shown.
        Speaker: Verena Kain
      • 09:20
        Intensity ramp-up: 2011 experience - Limitations, mitigation, risks, strategy, pushing it in 2012, 1380 in 3 weeks? 25m
        The experience with ramping up the beam intensities in the early days of the 2011 run and after the subsequent technical stops will be summarized. Weak points and limitations will be identified and their possible mitigations evaluated. In view of the risks and drawbacks of a too aggressive approach, possible improvements of the applied strategy whilst maintaining the required validation points for the various equipment and machine protection system will be discussed.
        Speaker: Markus Zerlauth
        Paper
        Slides
      • 09:45
        Transverse feedback: high intensity operation, AGC, IGC, lessons for 2012 25m
        The transverse damper system (ADT) plays an important role in the preservation of the beam transverse emittance and for damping of oscillations driven by the coupled bunch instability. An overview of the ADT system will be presented with an emphasis on the important feedback loop parameters as they change from injection through the ramp into collision. The dedicated setting up procedure required for the different bunch intensities and bunch spacings will be explained. During the 2011 run the injection and abort gap cleaning became operational at injection energy. Preparations for cleaning at 3.5 TeV as well as batch selective transverse blow-up were completed and preliminarily tested. Plans for 2012 include study and potential improvement of the system impulse response to improve the 'selectivity' of the cleaning and blow up facility. The ADT also provides bunch- by-bunch observation which was extensively used during the run and MDs and will be further upgraded during the next year.
        Speaker: Daniel Valuch
    • 10:10 10:40
      Coffee Break 30m 6th floor, Royal Hotel

      6th floor, Royal Hotel

    • 10:40 12:20
      Session 5: Beam loss and machine protection Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      paper
      • 10:40
        MPS response: issues, close shaves, holes, commissioning and validation procedures, rMPP role and response, change management (incl. SW releases) 25m
        The performance of the machine protection system during the 2011 run will be briefly summarized. Emphasis will be given to events which risked to exposed parts of the machine to damage. Further improvements and mitigations of potential holes in the protection systems as well as in the change management will be evaluated along with their impact on the 2012 run. The role of rMPP during the various operational phases (commissioning, intensity ramp up, MDs…) will be discussed.
        Speaker: Markus Zerlauth
        Paper
        Slides
      • 11:05
        UFOs: statistics, dependencies, MKI findings, hypotheses, models, FLUKA results, extrapolation to 7 TeV 25m
        UFOs are potentially the performance limitation for nominal LHC operation. Therefore, in 2011, the diagnostics for UFO events were significantly improved, dedicated experiments and measurements in the LHC and in the laboratory were made and complemented by FLUKA simulations and theoretical studies. In this talk, the state of knowledge is summarized and extrapolations for LHC operation in 2012 and beyond are presented. Mitigation strategies are proposed and related tests and measured for 2012 are specified.
        Speaker: Tobias Baer
        Paper
        Slides
      • 11:30
        Multi-turn losses and cleaning: collimator set-up, loss map methodology and frequency, use of on-line data to validate 25m
        LHC beam collimation is based on a hierarchical multi-stage cleaning system. Maintaining the correct hierarchy ensures maximal cleaning efficiency and machine protection. The operational collimator positions are established from the beam centres and sizes at each collimator measured in beam-based alignments. These are verified periodically during the year. The improvements made to the collimator alignment algorithm in 2011 are described. The time spent on setup and qualification by loss maps is summarized in detail. The stability of the collimator setup and cleaning efficiency is presented. An outlook to 2012 is given, including detailed considerations on improved setup speed, required frequency of setup and qualification and other possible improvements overall reducing beam time consumption for collimation.
        Speaker: Gianluca Valentino
        Paper
        Slides
      • 11:55
        Beta* reach: in depth analysis of 2011 – orbit, tolerances, aperture, feed-in to 2012, correction below 1 m, risk from asynch dump, hw limitations 25m
        The available aperture in the LHC imposes a lower limit on the achievable beta*. The aperture must be protected by the collimation system, and the collimator families have to be ordered in a strict hierarchy for optimal performance, with large enough margins that the hierarchy is not violated by machine imperfections such as closed orbit distortions or beta-beating. The achievable beta* is thus a function of both the aperture and the collimator settings. An overview of the run in 2011 is presented, as well as a review of the necessary margins between collimator families and the aperture. Finally an outlook towards possible scenarios for beta* in 2012 and at higher energies is given.
        Speaker: Roderik Bruce
        Paper
        Slides
    • 12:20 14:00
      Buffet lunch 1h 40m Grand Salon

      Grand Salon

    • 14:00 15:15
      Session 6 : Systems operational performance Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      paper
      • 14:00
        Orbit and tune feedbacks/diagnostics – user perspective, performance, issues (ADT,QT trips) 25m
        Speaker: Laurette Ponce
        Abstract
        Paper
        Slides
      • 14:25
        Beam instrumentation - critical overview, beam size measurements – what happened to bunch by bunch, BPM (briefly) 25m
        Speaker: Mariusz Gracjan Sapinski
      • 14:50
        RF - matching, blow-up etc. system performance, intensity limits for 2012, de-bunching 25m
        Speaker: Philippe Baudrenghien
        Abstract
        Paper
        Slides
    • 15:15 15:45
      Coffee Break 30m 6th floor, Royal Hotel

      6th floor, Royal Hotel

    • 15:45 17:50
      Session 7: Limitations Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      paper
      • 15:45
        Impedance effects on beam stability 25m
        What was expected? What did we learn and what are the limitations from impedance? Effect of tight collimation settings, 25 ns vs 50 ns and 4 vs 3.5 TeV
        Speaker: Nicolas Mounet
        Paper
        Slides
      • 16:10
        Beam induced heating 25m
        What were the expected heat loads? Review of the observations on temperature increases / outgassing for kickers, collimators, etc. Anything around the corner? Next limitations? What is the expected effect of bunch length (with the measured bunch spectrum)? Can we explain the observed heat loads by impedance effects? Mitigation measures 25 ns vs 50 ns and 4 vs 3.5 TeV
        Speaker: Benoit Salvant
        Paper
        Slides
      • 16:35
        E-cloud effects 25m
        What were the expected heat loads/stability limits? What did we learn and what are the limitations from e-cloud in terms of beam stability, heat load? Comparison with measurements: heat load vs. RF stable phase shift, SEY and reflectivity from heat load and pressure rise data. Effect of scrubbing run and requirements on SEY to operate the machine with 25 and 50 ns at 3.5 and at 4 TeV
        Speaker: Giovanni Rumolo
        Paper
        Slides
      • 17:00
        e-cloud & vacuum instabilities 25m
        Vacuum and cryogenics observations: 25 ns vs 50 ns. Can e-cloud explain everything? Effects observed at TDI, experiments, triplets, impact on background, Estimations for a scrubbing run for 25 ns operation, Shall we have a scrubbing period at 25 ns to operate at 50 ns? Shall we have a scrubbing fill after every technical stop? Interplay with cryogenics and potential solution or mitigation measures
        Speaker: Giuseppe Bregliozzi
        Paper
        Slides
      • 17:25
        Luminosity lifetime - protons 25m
        What did we learn and do we have a good model? What were the predictions (in particular LR)? Is beam-beam the only responsible for blow-up and luminosity lifetime? What did we learn and what are the limitations from beam-beam? Impact of separation (luminosity leveling), working point, crossing angle, 25 vs. 50 ns
        Speaker: Giulia Papotti
        Paper
        Slides
    • 17:50 18:05
      Short Break 15m 6th floor, Royal Hotel

      6th floor, Royal Hotel

    • 18:05 19:45
      Talks from the experiments
      • 18:05
        TOTEM 20m
        Speaker: Simone Giani (CERN)
        Slides
      • 18:25
        LHCb 20m
        Speaker: Pierluigi Campana (Laboratori Nazionali di Frascati (LNF))
        Slides
      • 18:45
        ALICE 20m
        Speaker: Paolo Giubellino (Universita e INFN (IT))
        Slides
      • 19:05
        ATLAS 20m
        Speaker: Dr. Fabiola Gianotti (CERN)
        Slides
      • 19:25
        CMS 20m
        Speaker: Guido Emilio Tonelli (CERN)
        Slides
    • 20:00 22:00
      Cocktails and Dinner 2h Restaurant La Véranda

      Restaurant La Véranda

      Royal Hotel

    • 09:00 10:40
      Session 8: 2012 Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      • 09:00
        View from experiments including special physics run 25m
        Speaker: Benedetto Gorini
        Abstract
        Slides
      • 09:25
        Outlook for 2012 25m
        The approved 2012 schedule is shown. The possible options for the key parameters (energy, bunch spacing, beta*) to be used in 2012 are discussed. A limited number of scenarios are considered and estimates of their potential performance presented.
        Speaker: Mike Lamont
        Paper
        Slides
      • 09:50
        Implications of higher energy - summary of benefits, issues, commissioning cost, (SEUs? Cryo, QPS margins? Potential availability issues?) 25m
        Speaker: Reyes Alemany Fernandez
        Abstract
        Paper
        Slides
      • 10:15
    • 10:40 11:00
      Coffee break 20m 6th floor, Royal Hotel

      6th floor, Royal Hotel

    • 11:00 11:40
      Session 9: Summary of Sessions Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains
      • 11:00
        Summary of Session 1 5m
        Speaker: Jorg Wenninger
        Slides
      • 11:05
        Summary of Session 2 5m
        Speaker: Jan Uythoven
        Minutes
        Slides
      • 11:10
        Summary of Session 3 5m
        Speaker: Malika Meddahi
        Slides
      • 11:15
        Summary of Session 4 5m
        Speaker: Bernhard Holzer
        Slides
      • 11:20
        Summary of Session 5 5m
        Speaker: Brennan Goddard
        Slides
      • 11:25
        Summary of Session 6 5m
        Speaker: Eva Barbara Holzer
        Slides
      • 11:30
        Summary of Session 7 5m
        Speaker: Gianluigi Arduini
        Slides
    • 11:40 12:10
      Wrap-up Salon Edelweiss/Hélianthème

      Salon Edelweiss/Hélianthème

      Royal Hotel

      Evian-les-Bains