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LHC Injectors Upgrade Workshop
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Europe/Zurich
Royal Plaza Montreux & Spa
Royal Plaza Montreux & Spa
Av. Claude Nobs 7
1820 Montreux
SUISSE
Giovanni Rumolo
(CERN),
Malika Meddahi
(CERN)
Description
The LIU workshop will take place in Montreux, 13-15 February. The workshop will focus on the following three pillars, addressing the past experience/finding/projected beam performance reach, the LS2 system readiness/work execution, and the HW and beam commissioning preparatory and execution phases.
1. LIU Performance
- Wrap-up LIU beam performance reach - baseline and mitigation scenarios for both protons and ions
- Present the sensitivity of HL-LHC integrated performance reach to variations in LIU delivered parameters
- Summarise conclusions from run 2 MD and operation in 2018, in context of LIU parameters and performance
- List beam performance related activities in 2019-2020 (LS2) (data analysis, simulations, code development …)
- List LIU beam measurements needed during run3
2. LS2: system readiness and shutdown execution
- List RFI dates for LIU equipment in the context of machine installation planning
- Identify critical delivery path items (or already late) and discuss mitigation
- Review readiness prospects for selected highest risk/impact systems (incl. some IST)
- List known NCs or variation from specified equipment performance, and impact
- Present status of related general safety documentation and identify outstanding items
- Present risk analysis of LIU installation planning with mitigation (with agreed methodology)
- List hardware related improvements postponed to post LS2 and performance impact
- List of any items needing upgrade that were missed from LIU
- Overview of spares for start-up
3. LIU hardware and beam commissioning
- Activity organisation and responsibilities
- Review IST, requirements and identify potential risks with mitigations, in context of LS2 and restart planning
- HW commissioning: status of plans, requirements (services, signals, controls, applications, procedures, check-lists…), risks, mitigations, resource conflicts
- Beam commissioning: timeline, milestones, documentation for beam permit, pre-LS2 beam performance recovery and LIU beam commissioning plans, requirements (settings management, on-line monitoring, tools, applications)
Attendance is by invitation only.
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13:30
Bus Departure - CERN-MONTREUX
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15:00
Welcome coffee
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1
Setting the scene for LIU
- Motivations and goals of the workshop
- Status of the project in terms of budget, manpower and schedule
- LIU project lifecycle and organisation
- LIU within CERN: current structure of the project, benefits, drawbacks
- Activities by machine with safety, planning and budget overall
- Core meetings: LIU-PT, LIU Beam Performance, LIU with equipment groups
- Reporting lines (including LIU/HL-LHC Executive committee, C&S reviews)
- Interface with HL-LHC
- LS2 project phase and structure
Speaker: Malika Meddahi (CERN) -
Session 1: LIU beam performanceConveners: Giovanni Rumolo (CERN), Heiko Damerau (CERN)
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2
Beam parameter requirements from HL-LHC
- Keywords: Beam performance target, Protons and Ions
- Questions to be answered:
- What are the baseline beam parameters and the most interesting filling scheme for HL?
- What are the assumptions, do we need to review any of the assumptions based on 2018 experience or gained knowledge on some other items?
- Specs on bunch-by-bunch variations within trains?
- What is the sensitivity of lumi target/LHC availability to beam parameters? What is the balance between pushing beam intensity/quality in injectors and time lost during filling?
- Impact on needs from injectors in case not all HL-LHC upgrades can be implemented?
- Can HL-LHC compensate for a lack in intensity from injectors?
Speaker: Rogelio Tomas Garcia (CERN) -
3
Performance and reliability with ions from Linac3 to PS
- Keywords: Ions across chain, performance and reproducibility, bottlenecks
- Questions to be answered:
- What are the expected improvements in Linac3 (source, autopilot, new LLRF)?
- What are the key ingredients for the improvement of LEIR performance and reliability achieved in 2018?
- Is the impact of new diagnostics tools visible (new injection line BPMs, new orbit measurement system in LEIR, energy matching at injection in LEIR) and what it the potential?
- Which margins are needed to reliably deliver or exceed LIU beam parameters?
- Experience in Linac3/LEIR/PS from the LHC ion run, any bottlenecks found in PS with nominal (4 bunches with bunch splitting, 100 ns) and alternative (3 bunches, 75 ns)?
- Which key simulations with ions must be performed during LS2?
Speaker: Nicolo Biancacci (CERN) -
4
Beam quality and reproducibility from Linac4, including strategy for its source
- Keywords: Source; beam quality, reliability, readiness
- Questions to be answered:
- How far did we go in 2018 in terms of beam quality, reliability, typical operational scenarios, integration in operation?
- What do we expect to learn from LBE tests in 2019?
- Which is the present performance and future strategy for the source?
- What is the future (baseline) path for source/RFQ/LEBT improvements?
- Are there any items which may require consolidation or upgrade in the post-LIU era?
Speaker: Alessandra Lombardi (CERN)
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2
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17:20
Leg stretch
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Session 1: LIU beam performanceConveners: Giovanni Rumolo (CERN), Heiko Damerau (CERN)
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5
Acceleration and longitudinal emittance control in the PSB after LIU
- Keywords: New cycle, new RF system
- Questions to be answered:
- How does the experience with the longitudinal emittance blow up by phase noise compare to particle tracking? What are the limitations of this blow-up technique? Can we completely retire the blow-up using modulated higher-harmonic RF?
- Limitations and margins with new 2 GeV cycle (duration from injection to extraction)?
- What are the expected longitudinal stability limitations due to the new Finemet RF system with LLRF feedback?
- How far are we with commissioning of Finemet RF system and relative LLRF (with specs for future operation – which harmonics, what functions for blow up)?
Speaker: Simon Albright (CERN) -
6
Brightness and transverse emittance from the PSB
- Keywords: New injection, emittance measurements, brightness goal, optics control
- Questions to be answered:
- How does the pre-LS2 performance, including the latest brightness curve compare with expectations from theory and simulations?
- What are the challenges of 160 MeV H- injection and the new expected brightness line?
- Do we understand the emittance measurements in PSB with different devices?
- What are expectations and limits with new transverse feedback system?
Speaker: Fanouria Antoniou (CERN) -
7
Transverse effects with twice brighter beams in the PS
- Keywords: Emittance growth, new 2 GeV injection
- Questions to be answered:
- Do we understand the relative weight of all potential contributors to emittance growth at injection (mismatch, kicker waveforms, injection bump, space charge, injection settings)?
- What will change after LIU (2 GeV, BTP, faster bump collapse, …)?
- How confident can we be to double the brightness with reduced space charge at 2 GeV and with larger longitudinal emittance?
- What is the importance of the transverse damper in the PS routinely operation?
Speaker: Matthew Alexander Fraser (CERN) -
8
PS intensity reach and longitudinal parameters after LIU
- Keywords: Longitudinal instabilities, past and future RF improvements, beam quality, bunch rotation
- Questions to be answered:
- What is the parameter reach in terms of intensity/longitudinal emittance? What was achieved in 2018 and what is expected from simulations with the further LS2 RF improvements?
- What is the contribution of each of the upgrades (coupled-bunch, 1-turn delay, multi-harmonic feedbacks)?
- Which impedance sources mainly excite the observed instabilities?
- Are there any new ideas to further improve the longitudinal beam quality, e.g. bunch shape after rotation, to better suit the SPS?
- What are the observed and expected bunch-by-bunch parameter variations (2018 and post-LIU)?
Speaker: Alexandre Lasheen (CERN)
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5
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20:00
Dinner
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13:30
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Session 1: LIU beam performanceConveners: Giovanni Rumolo (CERN), Heiko Damerau (CERN)
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9
Transverse beam quality and stability in the SPS (protons and ions)
- Keywords: SPS transverse stability, electron cloud, emittance growth, optics
- Questions to be answered:
- What has been learned from acceleration LIU-like intensity in the SPS, in particular with short bunch trains?
- What are the operational challenges with large tune shifts?
- Which are pros and cons of the possible optics Q20 versus 22 versus 26 (for protons and ions)?
- What do we know about transverse stability for high intensity beams?
- What is the transverse emittance growth as a function of bunch intensity (also for ions)?
- How complete is the transverse impedance model?
- Where do we stand with the removal of momentum bottlenecks?
- Can we rely on scrubbing for post-LIU operation? To which extent?
- What is the experience with ions in 2018?
Speaker: Hannes Bartosik (CERN) -
10
Longitudinal beam quality and stability in the SPS (protons and ions)
- Keywords: Longitudinal stability, RF upgrade, impedance reduction, slow losses
- Questions to be answered:
- What has been achieved with the acceleration of short bunch trains at highest intensities?
- Do we understand the losses at flat-bottom and the longitudinal instabilities? What is the effect of different optics?
- Which improvement do we expect from impedance reduction?
- How complete is the longitudinal impedance model?
- How can 2018 observations with high-intensity beams be projected to the after-LIU era?
- What is the impact of RF upgrade and impedance reduction on intensity reach?
- What are limitations and requirements of double RF acceleration with 800 MHz?
- Can we expect a better ion lifetime in the SPS due to the RF upgrade (power and LLRF)?
- What can be learned from 2018 measurements with ions (including slip stacking tests)?
Speaker: Elena Shaposhnikova (CERN) -
11
Wrap up of Session 1: LIU beam performance reach
- Keywords: LIU target performance, risks, mitigations, challenges for post-LIU and beam commissioning, protons and ions
- Questions to be answered:
- What are the baseline beam parameters for LIU and the alternative production schemes (protons and ions)?
- What are the assumptions, do we need to review any of the assumptions based on 2018 experience or gained knowledge on some other items?
- What we can definitely tick out from Run 2 experience and what we still need to study in LS2 and prove in Run 3 (simulation and post-LS2 MDs)?
- How to balance pushing performance for protons and ions after LS2? Is slip-stacking with ions feasible in the first year?
- Bunch-by-bunch variations within trains?
Speakers: Giovanni Rumolo (CERN), Heiko Damerau (CERN)
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9
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10:00
Coffee break
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Session 2: LS2 system readiness and shutdown executionConveners: Brennan Goddard (CERN), Julie Coupard (CERN)
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12
Beyond LS2: spares, NCs and upgrades after LS2
- Overview of spares for start-up – identifying whether the available spares can be considered ready to use or they need testing/other procedure(s) before being used
- List known NCs or variation from specified equipment performance, and impact (to be discussed here should be impact on schedule, while impact on performance should be addressed in collaboration with S1)
- Catalogue of upgrades not performed inside LIU, but identified as postponed, optional or potential (to complete…)
- PSB 14L1 impedance reduction
- PS Landau cavity
- SPS arc aC coating
- SPS impedance reduction
- SPS QD aperture improvement
- SPS MKP impedance reduction
- SPS 200 MHz powering CONS (impact on peak power)
- SPS 800 MHz pulsed-mode operation
- SPS final BSRT
- SPS TCDIL controls CONS
- Cost, performance effect, when available for installation/deployment
- Framework for follow-up of these items through Run3 and LS3
Speaker: Giovanni Rumolo (CERN) -
13
LS2 Organisation and committee meeting
- Overview on the organisation of the LS2 (organigram, reporting lines, responsibilities)
- Committee structure, mandate and frequency (LS2C, machine shutdown coordination, …)
- Mechanisms for handing delays, problems and unforeseen eventualities
Speaker: Jose Miguel Jimenez (CERN) -
14
Linac4 Connection
- Planning overview and breakdown
- Major activities and critical path analysis
- Highlight on LIU activities
- Dependencies and impact between LIU and other ongoing projects in LS2 (e.g. CONS, Fire Safety, HL-LHC)
- Co-activities
- Milestones of general services availability
- Remaining issues/uncertainties
Speaker: Simon Mataguez (CERN) -
15
PSB
◾Planning overview and breakdown
◾Major activities and critical path analysis
◾Highlight on LIU activities
◾Dependencies and impact between LIU and other ongoing projects in LS2 (e.g. CONS, Fire Safety, HL-LHC)
◾Co-activities
◾Milestones of general services availability
◾Remaining issues/uncertaintiesSpeaker: David Hay (CERN) -
16
PS
◾Planning overview and breakdown
◾Major activities and critical path analysis
◾Highlight on LIU activities
◾Dependencies and impact between LIU and other ongoing projects in LS2 (e.g. CONS, Fire Safety, HL-LHC)
◾Co-activities
◾Milestones of general services availability
◾Remaining issues/uncertaintiesSpeaker: Fernando Baltasar Dos Santos Pedrosa (CERN) -
17
SPS
◾Planning overview and breakdown
◾Major activities and critical path analysis
◾Highlight on LIU activities
◾Dependencies and impact between LIU and other ongoing projects in LS2 (e.g. CONS, Fire Safety, HL-LHC)
◾Co-activities
◾Milestones of general services availability
◾Remaining issues/uncertaintiesSpeaker: David Mcfarlane (CERN)
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12
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12:40
Lunch
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Session 2: LS2 system readiness and shutdown executionConveners: Brennan Goddard (CERN), Julie Coupard (CERN)
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18
General Safety
- LIU Safety objectives
- LIU Safety documentation (organisation, LIU safety packages, methodology for the descriptive and demonstrative parts of the LIU safety files)
- Conformity of the LIU equipment to the CERN Safety rules and the regulation, and process of HSE electrical pre-visits
- Safety milestones towards beam permits
Speaker: Anne Funken (CERN) -
19
Overall Shutdown Planning
- Activities by group across all facilities
- Known resource conflicts
Speaker: Julie Coupard (CERN) -
20
Readiness for Installation Dates, Critical Path and Risks
- Readiness for Installation dates per group with present equipment status (STI, EPC, ABT, BI, RF, MSC, VSC)
- Risk analysis of LIU equipment:
Identify critical delivery path items (or already late) - Evaluate the impact on the shutdown activities
- Discuss mitigation (with agreed methodology)
Speaker: Jonathan Pascal Meignan (CERN) -
21
Refurbishment of Building 269 for the Consolidation of the TT2 Power Converters
- Review readiness prospects and critical subsystems for selected highest risk/impact systems
- Preparation planning with present status (delivery, assembly, vacuum acceptance tests, pre-tests, etc… up to readiness for installation)
- Specify IST periods and dependencies on other groups/support
- Identification of specific technical an schedule risks and mitigations
Speaker: Valerie Montabonnet (CERN)
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18
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15:40
Coffee break
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Session 2: LS2 system readiness and shutdown executionConveners: Brennan Goddard (CERN), Julie Coupard (CERN)
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22
SPS 200 MHz Overall (power, LL, SW, beam obs, CCC integration)
- Review readiness prospects and critical subsystems for selected highest risk/impact systems
- Preparation planning with present status (delivery, assembly, vacuum acceptance tests, pre-tests, etc… up to readiness for installation)
- Specify IST periods and dependencies on other groups/support
- Identification of specific technical an schedule risks and mitigations
Speaker: Frank Gerigk (CERN) -
23
SPS Beam Dump Overall (CE, Kickers, infrastructure, status, concurrency, …)
- Review readiness prospects and critical subsystems for selected highest risk/impact systems
- Preparation planning with present status (delivery, assembly, vacuum acceptance tests, pre-tests, etc… up to readiness for installation)
- Specify IST periods and dependencies on other groups/support
- Identification of specific technical an schedule risks and mitigations
Speaker: Etienne Carlier (CERN) -
24
Beam Intercepting Devices
- Review readiness prospects and critical subsystems for selected highest risk/impact systems
- Preparation planning with present status (delivery, assembly, vacuum acceptance tests, pre-tests, etc… up to readiness for installation)
- Specify IST periods and dependencies on other groups/support
- Identification of specific technical an schedule risks and mitigations
Speaker: Francois-Xavier Nuiry (CERN) -
25
Session wrap upSpeakers: Brennan Goddard (CERN), Julie Coupard (CERN)
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22
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26
Reserved buffer
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19:00
Cocktail at the Sinatra's bar
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20:00
Dinner
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08:30
Group photo
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Session 3: LIU hardware and beam commissioningConveners: Alexander Huschauer (CERN), Verena Kain (CERN)
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27
Organisation of commissioning activities
o Keywords:
- BCWG, 2019/20 activities, organisation, responsibilities, commissioning phases
o Points to be addressed:
- Review of the 2018 BCWG activities and achievements
- Outline for activities in 2019/20
- Organisation, structure and responsibilities for 2019/20 activities and beyond
- Global planning to achieve LIU beam parameters.
- Introduction of different commissioning phases (dry runs, hardware commissioning, check-out, beam commissioning)
Speakers: Alexander Huschauer (CERN), Verena Kain (CERN) -
28
Hardware commissioning across the injector complex
o Keywords:
- strategy, check lists, applications, IST, tools, potential issues
o Points to be addressed and questions to be answered :
- Addressing HWC across the injector complex (considering current and new LIU equipment)
- Review of commissioning strategy, planning and check lists
- Review the required status of controls and applications and identify additional needs
- What are the critical IST during hardware commissioning (for the different machines)?
- Are the available tools ready to be used or are modifications necessary?
- Can potential unknowns or issues be identified already at this stage?
Speaker: James Ridewood (CERN) -
29
Readiness of RF equipment across the injector complex
o Keywords:
- IST, cold check-out, time lines, settings management, tools, slip stacking
o Points to be addressed and questions to be answered:
- Planning from IST to cold check-out across the injectors (including Linac3) with special focus on the SPS
- Definition of time lines for different implementation phases towards operational system
- Address settings management and the status of available tools including requirements and milestones for new developments
- What are the lessons learnt from Linac4, PS LLRF issues (missing references), SPS 800 MHz commissioning and how will they impact the 2019/20 activities?
- Detailed time line and milestones for slip stacking commissioning.
- How can the SPS cavity test stand be exploited to test controls,…
Speaker: Andy Butterworth (CERN) -
30
Operating the injector complex after LS2
o Keywords:
- operational and controls aspects, scheduling, physics concepts, timing system, forum, beam instrumentation, performance monitoring, optimisation algorithms/machine learning
o Points to be addressed and questions to be answered:
- Discuss requirements and ideas to improve and facilitate operation after LS2
- Consider operational and controls aspects
- Discuss common scheduling strategies between injectors and LHC, including MDs to achieve LIU parameters.
- Define strategies for setting-up.
- Incorporation of physics concepts into the control system: where do we stand and what remains to be done?
- Address settings management, improved LSA-tools interface, optics integration, …
- Short and long-term improvements of the timing system (cycle and sequence management)
- Address the establishment of a common body/forum to align concepts and strategies among the injectors.
- Address the commissioning of beam instrumentation (wire scanners, ALPS, BGI, …) including potential additional manpower requirements
- Discuss a common strategy across machines for follow-up and performance tracking
- required tools, potential additional developments
- How can operation benefit from optimisation algorithms and machine learning tools?
Speaker: Delphine Jacquet (CERN)
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27
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10:40
Coffee break
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Session 3: LIU hardware and beam commissioningConveners: Alexander Huschauer (CERN), Verena Kain (CERN)
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31
Linac4 and LBE line commissioning
o Keywords:
- time line, goals, milestones, additional requirements, tools, optimisation algorithms, machine learning tools, connection pre-tests
o Points to be addressed and questions to be answered:
- Present the time line for 2019/20 activities
- Discuss the goals and define milestones
- What are the infrastructure requirements in terms of controls, timing, RF, …?
- What are the requirements in terms of applications/tools and what is the time line of potential new developments?
- Identify potential critical items/unknowns that could impact the schedule
- How can the activities benefit from optimisation algorithms and machine learning tools?
- Discuss the pre-tests for connection.
- Implications of the CERN 2020 christmas closure on BC activities (lock-out strategy, piquet planning, rapid start-up,...)
Speaker: Bettina Mikulec (CERN) -
32
Timeline and requirements for beam commissioning in the SPS
o Points to be addressed:
- Detailed planning for pre-LS2 beam performance recovery according to the master schedule
- Define milestones for the different beam commissioning phases for LHC and non-LHC beams
- Details on commissioning of LIU equipment
- Hardware and software prerequisites
- Identify potential critical items/unknowns that could impact the schedule
- Implications of the CERN 2020 christmas closure on BC activities (lock-out strategy, piquet planning, rapid start-up,...)
Speaker: Kevin Shing Bruce Li (CERN) -
33
Timeline and requirements for beam commissioning in the PS
o Points to be addressed:
- Detailed planning for pre-LS2 beam performance recovery according to the master schedule
- Define milestones for the different beam commissioning phases for LHC and non-LHC beams
- Details on commissioning of LIU equipment
- Hardware and software prerequisites
- Identify potential critical items/unknowns that could impact the schedule
- Implications of the CERN 2020 christmas closure on BC activities (lock-out strategy, piquet planning, rapid start-up,...)
Speaker: Frank Tecker (CERN) -
34
Timeline and requirements for beam commissioning in the PSB
o Points to be addressed:
- Detailed planning for pre-LS2 beam performance recovery according to the master schedule
- Define milestones for the different beam commissioning phases for LHC and non-LHC beams
- Details on commissioning of LIU equipment
- Hardware and software prerequisites
- Identify potential critical items/unknowns that could impact the schedule
- Implications of the CERN 2020 christmas closure on BC activities (lock-out strategy, piquet planning, rapid start-up,...)
Speaker: Gian Piero Di Giovanni (CERN) -
35
Timeline and requirements for beam commissioning across the ion chain
o Points to be addressed:
- Detailed planning for for Linac3 and LEIR pre-LS2 beam performance recovery according to the master schedule
- Define milestones for the different beam commissioning phases
- Milestones for slip stacking
- Details on commissioning of LIU equipment
- Hardware and software prerequisites
- Identify potential critical items/unknowns that could impact the schedule
- Implications of the CERN 2020 christmas closure on BC activities (lock-out strategy, piquet planning, rapid start-up,...)
Speaker: Reyes Alemany Fernandez (CERN) -
36
Wrap-upSpeakers: Alexander Huschauer (CERN), Verena Kain (CERN)
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31
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37
Acknowledgement and Lunch
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14:00
Bus Departure - MONTREUX-CERN
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08:30
