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International Review of the HL-LHC Collimation System

Europe/Zurich
30/7-018 - Kjell Johnsen Auditorium (CERN)

30/7-018 - Kjell Johnsen Auditorium

CERN

190
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Description

Mandate

The main objective is to review the collimation system of HL-LHC in view of the LHC Run1 and Run2 experience and the suitability for installation in the LHC. The review will examine the upgrades in the experimental and cleaning insertion regions as well as the new cleaning systems in the dispersion suppressor regions of P7 and P2.

Review Panel

Ralph Assmann (DESY), Wolfram Fischer (BNL), Mike Lamont (CERN), Mike Seidel (PSI, Chair), Alban Sublet (CERN), Walter Venturini (CERN).

Scientific secretary: Alessio Mereghetti | S. Redaelli: link person for the HL-LHC Collimation upgrade (WP5)

Date and Place: 11th – 12th February 2019 at CERN (Auditorium TE 30-7-018).

Format

One and a half day presentations and discussions, followed by an executive meeting of the committee and a close-out on the second day. Following the close-out by the review chair, the committee is asked to compile a short report with findings, comments and recommendations within one month. The report will be delivered to O. Brüning, HL-LHC Deputy Project Leader and L. Rossi, HL-LHC Project Leader.

Charges: See attached document.

Participants
  • Adriana Rossi
  • Alessandro Masi
  • Alessio Mereghetti
  • Alex Fomin
  • Andreas Waets
  • Anton Lechner
  • Arjan Verweij
  • Arkadiusz Gorzawski
  • Belen Maria Salvachua Ferrando
  • Benoit Salvant
  • Christelle Gaignant
  • Cristina Adorisio
  • Daniel Wollmann
  • Daniele Mirarchi
  • Diego Perini
  • Eleftherios Skordis
  • Eleonora Belli
  • Elias Metral
  • Federico Carra
  • Francesco Cerutti
  • Gabriella Azzopardi
  • Gianluigi Arduini
  • Giorgia Gobbi
  • Giuseppe Bregliozzi
  • Hector Garcia Gavela
  • Hector Garcia Morales
  • Heinz Vincke
  • Inigo Lamas Garcia
  • Jean-Frederic Fuchs
  • John Jowett
  • Marco D'Andrea
  • Markus Zerlauth
  • Massimo Giovannozzi
  • Michele Modena
  • Michele Pasquali
  • Oliver Aberle
  • Oliver Bruning
  • Przemyslaw Daniel Pastuszak
  • Riccardo De Maria
  • Roberto Losito
  • Roderik Bruce
  • Rogelio Tomas Garcia
  • Simone Gilardoni
  • Vincent Baglin
  • Yannis Papaphilippou
  • Monday 11 February
    • 08:15 08:45
      Executive Session (closed session AM) 30/6-019

      30/6-019

      CERN

      20
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    • 08:45 09:30
      Introductory Session 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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      • 08:45
        Welcome, introduction and mandate 15m

        • Detailed introduction of upgrade plans
        • Review of HL-LHC parameters
        • Brightness frontier in Run III following LIU upgrade

        Speaker: Oliver Bruning (CERN)
      • 09:00
        Collimation upgrade plans 30m

        • Detailed introduction of upgrade plans
        • Definition of timeline for the WP5 upgrade: LS2 and LS3 plans
        • Recap. of the planned consolidation activities, impacts for the HL goals
        • Introduce the new design features relevant for HL: BPM collimators, new jaw design
        • Recap. status and plans for hollow e-lenses and crystals
        • Recap. of the last technical review for HL-LHC at Chamonix 2018 for collimation

        Speaker: Stefano Redaelli (CERN)
    • 09:30 11:00
      Session 1: Review of the operational experience in Run I and Run II 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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      • 09:30
        Overview of present collimation performance (20+10) 30m

        • Evolution of settings and protected aperture for small beta*
        • Cleaning performance throughout the years
        • Performance of IR cleaning (incoming and outgoing)
        • Relevant system faults and HL-LHC protected aperture
        • System failures, availability and sources of downtime
        • Review of beam loss cases inducing damage

        Speaker: Roderik Bruce (CERN)
      • 10:00
        Beam losses, lifetime and operational experience at 6.5 TeV (20+10) 30m

        • Review beam losses and lifetime for protons and ions
        • Stability and reproducibility: collimation settings
        • Stability and reproducibility: orbit and optics
        • Tail population measurements
        • Experience with beam failures damaging the collimator

        Speaker: Belen Maria Salvachua Ferrando (CERN)
      • 10:30
        Performance of new designs deployed in Run II and plans for Run III (20+10) 30m

        • New jaw design and performance of BPM collimators
        • Operational performance of the TCSPM prototype in 2017-2018
        • Software improvements and performance in Run II: alignment and BPM interlocks (including machine learning)
        • Prospect for further improvements, including machine learning
        • Recap. of Run III layouts

        Speaker: Alessio Mereghetti (CERN)
    • 11:00 11:30
      Group picture and Coffee break 30m 272-R-005

      272-R-005

      CERN

    • 11:30 13:00
      Session 2: Upgrade plans - performance and needs 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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      • 11:30
        Cleaning upgrades in the dispersion suppressors (20+10) 30m

        • Review technical solutions for DS around IR7 and IR2
        • Studies of different locations for IR7 and final layouts
        • TCLD design: settings and material choices. Functional specifications
        • Review key/critical points in the ECR (installation, safety, transport…)

        Speaker: Anton Lechner (CERN)
      • 12:00
        Quench performance and assumptions: simulations and beam tests (20+10) 30m

        • Collimation quench tests with protons: can we quench with proton beams?
        • Collimation quench tests with ions and BFPP quench tests
        • Benchmark of simulations: peak energy deposition for the different test

        Speaker: Eleftherios Skordis (CERN)
      • 12:30
        Quench performance and assumptions: magnets and cryogenics (20+10) 30m

        • Quench limits and possible limitations from cryogenics
        • Status of cryogenics limitations for different loss scenarios
        • Comparison of present dipole and 11T dipole

        Speaker: Luca Bottura (CERN)
    • 13:00 14:00
      Lunch break 1h
    • 14:00 16:00
      Session 2: Upgrade plans - performance and needs 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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    • 16:00 16:30
      Coffee break 30m 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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    • 16:30 18:00
      Session 2: Upgrade plans - performance and needs 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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      • 16:30
        IR collimation upgrades – outgoing beam (20+10) 30m

        • Layout for new IR1 and IR5: TCLs and masks
        • DS losses at high luminosity: any limitations for proton operations?
        • Status of mask specifications

        Speaker: Francesco Cerutti (CERN)
      • 17:00
        Plans and goals for remote alignment and impact on collimator designs (20+10) 30m

        • Overview of the overall plans, with specific aspects for WP5
        • Review tolerances and specifications
        • Timeline for critical decision points

        Speaker: Paolo Fessia (CERN)
      • 17:30
        Review of hollow e-lenses (20+10) 30m

        • Recap. previous reviews and status of baseline process
        • Design overview: where we are
        • Status of process for insertion into baseline

        Speaker: Adriana Rossi (CERN)
  • Tuesday 12 February
    • 08:30 10:30
      Session 3: Specific design aspects and production status 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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      • 08:30
        Status of LS2 production and prospect for LS3 (20+10) 30m

        • Review where we are: status of ongoing production for LS2
        • Recap. of experience of LS1 production:
        • Plans for future productions: what can we expect for LS3.
        • Comments on the prospect for in-kind contributions

        Speaker: Inigo Lamas Garcia (CERN)
      • 09:00
        Performance of new HL collimator designs (20+10) 30m

        • Status of collimator design. New collimators for IR cleaning
        • Summary of potential failure scenarios and resulting beam impact on the collimator jaws
        • Experience without beam with the prototypes
        • HiRadMat : overview and results. What is still missing? Needs for Run III (with LIU beams)
        • Status of results from radiation damage tests

        Speaker: Alessandro Bertarelli (CERN)
      • 09:30
        New materials: status (20+10) 30m

        • Review of the performance of the MoGr without and with coating
        • How can we optimize the production of MoGR?
        • Other viable solutions: status of tests and validation [coated Gr or CFC]
        • What is missing to validate the CuCD?

        Speaker: Federico Carra (CERN)
      • 10:00
        Review of vacuum performance (20+10) 30m

        • Review of vacuum tolerances for carbon-based materials
        • Proposed coating process for the collimator jaws
        • Observed 'problems' with the prototypes and proposed mitigation steps
        • IR7 vacuum tolerance in light of the vacuum bump test with beam
        • Other coating implementations for the HL-LHC other than on the collimator jaws

        Speaker: Giuseppe Bregliozzi (CERN)
    • 10:30 11:00
      Coffee break 30m 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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    • 11:00 12:00
      Session 3: Specific design aspects and production status 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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      • 11:00
        Collimator controls upgrade plans (20+10) 30m

        • Review performance of present system
        • Faults driving availability and expectations for HL-LHC
        Solutions being studied for controls upgrade, with timeline
        • Synergy with consolidation plans

        Speaker: Alessandro Masi (CERN)
      • 11:30
        Crystal collimation for lead ion beams (20+10) 30m

        • Layouts and beam test results
        • Operational experience with high intensities in 2018
        • Cleaning performance for ion beam collimation
        • Is it an operational alternative for improving ion beam cleaning?
        • Outcome of the Crystal Collimation day in Oct. 2018 (hardware options for LS2)

        Speaker: Daniele Mirarchi (University of Manchester (GB))
    • 12:00 13:00
      Lunch break 1h
    • 13:00 16:00
      Executive session (closed session PM) 30/6-019

      30/6-019

      CERN

      20
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    • 16:00 17:00
      Close-out 1h 30/7-018 - Kjell Johnsen Auditorium

      30/7-018 - Kjell Johnsen Auditorium

      CERN

      190
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