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International Review of HL-LHC Magnet Circuits
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Europe/Zurich
30/7-018 - Kjell Johnsen Auditorium (CERN)
Akira Yamamoto
(High Energy Accelerator Research Organization (JP))
Description
Mandate and objectives:
The Panel is invited:
- To review the final layout of the HL-LHC magnet circuits including the aspects related to powering and quench protection strategies, making sure that the right choices have been made both in terms of circuit optimization and protection reliability;
- To review the adequacy of the protection of the circuits for the different configurations that are adopted in order to assure safe commissioning and operation with beam. This aspect includes protection in case of quenches, failures of various components or of systems, effects of protection equipment to beam, protection of power converters, etc.;
- To review the integration of equipment respecting installation and maintainability requirements;
- To review the proposed instrumentation for protection and the ancillary equipment (feeders, feedthroughs, etc.) and its test in operational conditions in the IT String;
- To assess on the Electrical Quality Assurance strategy of cold/warm equipment and circuits, making sure that insulation coordination is properly established.
While this is mainly a technically oriented review, (managerial aspects are reviewed by special Cost & Schedule Reviews) the Panel may comment on the level of integration and collaboration between various Work packages and teams participating to the circuits design and realization.
Review Panel Members: Akira Yamamoto (KEK-CERN-Chair), Hans-Jörg Eckoldt (DESY), Jim Strait (FNAL), Neil Michell (ITER), Paolo Fessia (CERN) and Steve Gourlay (LBNL).
Link person: Felix Rodriguez Mateos
Scientific Secretary: Samer Yammine
Dates and Place: The review is scheduled from 9 September to 10 September 2019 at CERN, room 30/7-018.
Charges: See attached document.
Elodie Kurzen
Participants
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08:15
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08:45
Closed Session 30m 30/7-018 - Kjell Johnsen Auditorium
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08:45
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09:00
HiLumi Status and Charge to Review 15m 30/7-018 - Kjell Johnsen AuditoriumSpeaker: Lucio Rossi (CERN)
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09:00
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09:30
Quick Overview on the HL-LHC Magnets Characteristics 30m 30/7-018 - Kjell Johnsen Auditorium
This talk is intended to be a general introduction to the magnet designs and relevant aspects of the requirements, in particular the ones related to powering and optics.
Speaker: Dr Ezio Todesco (CERN) -
09:30
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10:00
Introduction to the HL-LHC Circuits and Report from Previous Review 30m 30/7-018 - Kjell Johnsen Auditorium
This talk presents a global view on the baseline of the HL-LHC circuits and a synopsis of the choices that were made to reach it. An important milestone for the definition of the circuits was the CERN Internal Review of the HL-LHC Magnet Circuits in March 2017. This review outcome and the implementation of the follow-up of the recommendations will be also presented.
Speaker: Felix Rodriguez Mateos (CERN) -
10:00
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10:30
Warm Powering and Adequacy with Respect to Requirements 30m 30/7-018 - Kjell Johnsen Auditorium
In order to achieve the requirements of the HL-LHC optics and in adequacy with the LHC machine, the power converters have strict requirements on performance. This talk presents the requirements of the circuits (current, ramp rates, acceleration rates, precision, accuracy, etc.) and translates them into power converter requirements (current, voltage, control and measurement class). Moreover, the required warm cable resistances and configuration are briefly discussed to respect the cycle operation requirements.
Speaker: Michele Martino (CERN) -
10:30
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10:45
Group picture and coffee break 15m 30/7-018 - Kjell Johnsen Auditorium
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10:45
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11:15
Cold Powering 30m 30/7-018 - Kjell Johnsen Auditorium
The cold powering configurations are presented in this talk. From current leads to the connection to the bus bars in the cold masses, through the superconducting link, this talk includes a description of the baseline including the requirements and the applied solutions. The present design status in terms of feedboxes is also included in the talk.
Speaker: Dr Amalia Ballarino (CERN) -
11:15
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11:40
Superconducting Bus Bars Inside Cryostats 25m 30/7-018 - Kjell Johnsen Auditorium
This talk contains a description of the variety of bus bars proposed for the connections from cold powering equipment to the actual magnet terminals. The rationale behind the different choices as well as the present baseline for splices and their location will be discussed.
Speaker: Ezio Todesco (CERN) -
11:40
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12:30
Quench Protection Strategies 50m 30/7-018 - Kjell Johnsen Auditorium
The definition of the quench protection strategies for each circuit type are discussed, based on analysis and simulations. Requirements and solutions for quench protection– including coils, bus bars, link, current leads- will be presented, from simulations to protection layouts, with a detailed view of the requirements and the results. Failure scenarios are also included in this talk.
Speaker: Arjan Verweij (CERN) -
12:30
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13:30
Working lunch break for Panel 1h
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13:30
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14:00
Quench Detection, related Hardware and Required Instrumentation 30m 30/7-018 - Kjell Johnsen Auditorium
How the quench detection is going to be performed on the different s.c. parts of the circuits? What hardware is going to be used? A discussion of the requirements and performance of the hardware will be presented. This talk includes a discussion on the required instrumentation expected for a dependable quench detection.
Speaker: Reiner Denz (CERN) -
14:00
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14:30
Quench Protection Hardware 30m 30/7-018 - Kjell Johnsen Auditorium
The different subsystems composing the quench protection system (other than the quench detectors) are presented in this talk. Namely, cold diodes, quench heater power supplies, energy extraction systems and CLIQ units are reviewed. The relevant aspects required for a dependable quench protection are discussed in this talk.
Speaker: Dr David Carrillo (CERN) -
14:30
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14:55
Design for the Protection and Diagnostic Feeders of the HL-LHC Triplets 25m 30/7-018 - Kjell Johnsen Auditorium
The design of the feeders serving the IFS CLIQ and k-mod systems to fulfil their thermo-electric, mechanical and cryogenic requirements will be presented. The routing of the related feedthroughs and ancillary equipment for connection at their warm and cold ends will be illustrated.
Speaker: Lloyd Ralph Williams (CERN) -
14:55
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15:25
Contribution of Power Converters to the Protection of the Circuits 30m 30/7-018 - Kjell Johnsen Auditorium
The contribution of the power converters to the protection of the circuits will be presented in the talk. Mainly, the crowbar systems will be described in addition to their operation. The resistance values of the crowbars and the different discharge curves in the case of power aborts will be shown in particular for the inner triplet circuit.
Speaker: Samer Yammine (CERN) -
15:25
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15:55
Effects of Protection Equipment on the Beam and Reliability Studies for the Circuit Protection Systems 30m 30/7-018 - Kjell Johnsen Auditorium
Spurious firing of the protection equipment can introduce an additional magnetic field to the magnets and can affect the beam trajectory. This talk will describe the effects of the protection equipment on the beam and the foreseen mitigations for the machine protection.
Speaker: Daniel Wollmann (CERN) -
15:55
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16:10
Coffee break 15m 30/7-018 - Kjell Johnsen Auditorium
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16:10
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16:40
Integration Studies 30m 30/7-018 - Kjell Johnsen Auditorium
An overview of the integration studies in the different underground areas and the corresponding baseline will be presented.
Speaker: Michele Modena (CERN) -
16:40
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17:10
Voltage Withstand Levels 30m 30/7-018 - Kjell Johnsen Auditorium
A review of the baseline for the voltage test levels which are to be used within the qualification of insulations in the different magnet systems, as well as the evolution of the applied criteria will be discussed.
Speaker: Felix Rodriguez Mateos (CERN) -
17:10
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18:30
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08:15
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08:45
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08:30
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09:00
11T MBH: Electrical Integrity and Quench Protection Test Results 30m 30/7-018 - Kjell Johnsen Auditorium
This talk presents the relevant results coming from tests performed on model, prototype and series magnets. The talk focuses on electrical integrity and quench protection tests, which are appropriate to the qualification of the insulation system and the quench protection strategy. In particular, the evolution of the quench heater insulation will be discussed.
Speaker: Frederic Savary (CERN) -
09:00
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09:30
MQXF: Electrical Integrity and Quench Protection Test Results 30m 30/7-018 - Kjell Johnsen Auditorium
This talk presents the relevant results coming from tests performed on model and prototype magnets. The talk focuses on electrical integrity and quench protection tests, which are appropriate to the qualification of the insulation system and the quench protection strategy. In particular, the evolution of the quench heater insulation will be discussed.
Speakers: Giorgio Ambrosio (Fermilab), Paolo Ferracin (CERN) -
09:30
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09:50
NbTi magnets: Electrical Integrity and Quench Protection Test Results 20m 30/7-018 - Kjell Johnsen Auditorium
This talk presents the relevant results coming from tests performed on model and prototype magnets. The talk focuses on electrical integrity and quench protection tests, which are appropriate to the qualification of the insulation system and the quench protection strategy.
Speaker: Arnaud Pascal Foussat (CERN) -
09:50
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10:05
Coffee break 15m 30/7-018 - Kjell Johnsen Auditorium
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10:05
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10:25
Document Plan, Management of Change 20m 30/7-018 - Kjell Johnsen Auditorium
The Magnet Circuit Forum has created, collected and managed the documentation for the HL-LHC magnet circuits and related studies. This talk will present the documentation plan for the HL-LHC magnet circuit and the strategy of the management of the change in accordance to the HL-LHC Project Documentation Plan.
Speaker: Samer Yammine (CERN) -
10:25
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10:55
The HL-LHC Inner Triplet String 30m 30/7-018 - Kjell Johnsen Auditorium
The complete systems’ validation in a full scale Inner Triplet String will be presented, including the proposed test programme, the schedule and the expected outcome.
Speaker: Marta Bajko (CERN) -
10:55
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11:15
Safety Aspects 20m 30/7-018 - Kjell Johnsen Auditorium
The HL-LHC underground galleries are accessible to personnel during operation of the accelerator. This implies the strict application of international or national standards for electrical safety to the installed equipment. I will present the Safety Process for HL-LHC equipment. It starts with a hazard assessment, and progresses with risk assessment, definition of mitigation, and safety checks. Finally, safety clearance is given by the project or by the Health, Safety and Environmental Protection Unit.
Speaker: Thomas Otto (CERN) -
11:15
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13:30
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13:30
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16:00
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13:30
Risk analysis of the string systems 15mSpeaker: Marta Bajko (CERN)
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13:45
Table with voltages and temperatures on QXF magnets 15mSpeaker: Dr Emmanuele Ravaioli (CERN)
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14:00
Voltage withstand levels and quench heater position for QXF and 11T MBH 1hSpeakers: Frederic Savary (CERN), Giorgio Ambrosio (Fermilab), Paolo Ferracin (CERN)
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15:00
Splices in HL-LHC cryostats 15mSpeaker: Herve Prin (CERN)
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15:15
Reliability of the complete inner triplet circuit protection 15mSpeaker: Andrea Apollonio (CERN)
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15:30
Feedback from LHC and MDs done with respect to effects to beam by misfiring of protection elements 15mSpeaker: Daniel Wollmann (CERN)
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15:45
How to guarantee security of firmware in quench detection and potential protection implications 15mSpeaker: Reiner Denz (CERN)
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13:30
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16:00
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17:15
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17:15
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18:15
Close out of the Review 1h 30/7-018 - Kjell Johnsen Auditorium
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08:30
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09:00
