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International Review of the HL-LHC Collimation System
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30/7-018 - Kjell Johnsen Auditorium (CERN)
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
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08:15
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08:45
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08:45
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09:30
Introductory Session 30/7-018 - Kjell Johnsen Auditorium
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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 upgradeSpeaker: 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 collimationSpeaker: Stefano Redaelli (CERN)
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08:45
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09:30
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11:00
Session 1: Review of the operational experience in Run I and Run II 30/7-018 - Kjell Johnsen Auditorium
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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 damageSpeaker: 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 collimatorSpeaker: 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 layoutsSpeaker: Alessio Mereghetti (CERN)
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09:30
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11:00
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11:30
Group picture and Coffee break 30m 272-R-005
272-R-005
CERN
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11:30
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13:00
Session 2: Upgrade plans - performance and needs 30/7-018 - Kjell Johnsen Auditorium
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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 testSpeaker: 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 dipoleSpeaker: Luca Bottura (CERN)
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11:30
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13:00
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14:00
Lunch break 1h
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14:00
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16:00
Session 2: Upgrade plans - performance and needs 30/7-018 - Kjell Johnsen Auditorium
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14:00
Operational experience with ions (20+10) 30m
• Review of relevant aspects in ions runs
• Plans for bumps in different IRs: IR1/5 without TCLD and IR2 with TCLD (without 11T)
• Are the bump solutions robust enough for the HL-LHC
• Luminosity reach with the present upgrade scenarios
• Brief highlights from the crystal collimation tests with ion beams during Run 2Speaker: Nuria Fuster Martinez (CERN) -
14:30
Status of 11T dipole project (20+10) 30m
• Overview talk from WP11: where we are and what are the plans for LS2
• Final configuration of cold masses and corrector package in new locations
• Summary of LS2’s ECRsSpeaker: Frederic Savary (CERN) -
15:00
Impedance models, operational experience and expected limitations (20+10) 30m
• IR7 upgrade plans in LS2 and LS3
• Experience from Run I and Run II
• Expectations for HL-LHC
• Review of beam tests with the low-impedance prototype
• Other mitigation options for impedance issues (new optics, asymmetric settings, new ATS) and drawbacks: theory and beam test resultsSpeaker: Elias Metral (CERN) -
15:30
IR collimation upgrades – incoming beam (20+10) 30m
• Layout for new IR1 and IR5
• Protected aperture and baseline settings
• Proposed material choices and their performanceSpeakers: Hector Garcia Morales (Royal Holloway University of London (RHUL)), Roderik Bruce (CERN)
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14:00
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16:00
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16:30
Coffee break 30m 30/7-018 - Kjell Johnsen Auditorium
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16:30
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18:00
Session 2: Upgrade plans - performance and needs 30/7-018 - Kjell Johnsen Auditorium
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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 specificationsSpeaker: 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 pointsSpeaker: 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 baselineSpeaker: Adriana Rossi (CERN)
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16:30
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08:15
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08:45
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08:30
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10:30
Session 3: Specific design aspects and production status 30/7-018 - Kjell Johnsen Auditorium
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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 contributionsSpeaker: 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 testsSpeaker: 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 jawsSpeaker: Giuseppe Bregliozzi (CERN)
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08:30
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10:30
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11:00
Coffee break 30m 30/7-018 - Kjell Johnsen Auditorium
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11:00
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12:00
Session 3: Specific design aspects and production status 30/7-018 - Kjell Johnsen Auditorium
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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 plansSpeaker: 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))
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11:00
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12:00
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13:00
Lunch break 1h
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13:00
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16:00
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16:00
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17:00
Close-out 1h 30/7-018 - Kjell Johnsen Auditorium
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08:30
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10:30
