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Dr Ezio Todesco (CERN)30/05/2023, 16:30
About the lecture:
In this talk we will review the main aims of test at cryogenic temperatures: electrical integrity, virgin training and performance, stability at flattop, retraining after thermal cycle, power losses and field quality. We will outline the main strategies adopted for high energy colliders, with a special attention on the LHC and on the HL LHC cases.
About the...
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Paolo Ferracin (LBNL)30/05/2023, 17:40
About the lecture:
“Training” represents one of the most studied, analyzed, and debated phenomenon in superconducting magnets. It can be defined as the occurrence of premature quenches at progressively increasing currents during consecutives ramps. When a magnet requires a large number of quenches to reach the operational current, the training campaign can have a significant impact on the...
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Philippe Bredy (CEA Saclay)31/05/2023, 16:30
About the lecture:
• Quick history of gas refrigeration and basic concepts of helium machines.
• Current general configuration.
• Main components of helium refrigerators.
• Efficiency.
• Integration in superconducting magnet cooling. Examples.About the speaker:
Philippe BREDY, cryogenic engineer at Accelerator, Cryogenics and Magnetism Department at CEA Saclay (France), in...
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Jean-Marc Poncet (CEA)31/05/2023, 17:40
About the lecture:
«Protection against excessive pressure in He Cryostats», aims to raise awareness of the risk of accidental overpressure in cryogenic devices. The main scenarios leading to this accident will be discussed, with particular emphasis on the breaking of the isolation vacuum. It is imperative that cryogenic equipment must be equipped with safety devices such as relief valves,...
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Sandor Feher (FNAL)01/06/2023, 16:30
About the lecture:
In this lecture an overview of the current leads operating on test stands that performing experiments with superconducting accelerator magnets will be presented. After a brief introduction about the basic principles of current leads – requirements and design challenges – a few test stand examples will be discussed. Then experience operating the current leads and issues...
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Samer Yammine (CERN)01/06/2023, 17:40
About the lecture:
Power converters play a central role in particle accelerators where both their performances are directly linked. As accelerator complexes develop towards higher beam energies and more towards a more sustainable nature, in response to the needs of physics research and of reducing the environmental impact, power converters are required to be on the forefront of technology....
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Jaromir Ludwin (HNINP)02/06/2023, 16:30
About the lecture:
Electrical failures in superconducting circuits can cause severe damage to the equipment and even lead to personal injury due to high operating currents. Often a significant energy stored in the magnetic field generated by the superconducting magnets becomes an additional risk factor.
The training course will cover various topics related to electrical integrity tests...
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Stoyan Stoynev (FNAL)02/06/2023, 17:40
About the lecture:
The notion of quench protection and detection in superconducting magnets will be introduced, along with detection requirements and where they come from. Standard for the accelerator magnet field approaches to quench detection will be described, main obstacles and solutions will be presented. Modern hardware/firmware/software implementations and examples will me...
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Joshi Piyush (BNL)05/06/2023, 16:30
Topics to be discussed during the lecture:
- Various techniques to protect the superconducting magnet during quenching.
- When and why, we need energy extraction.
- Different configuration of Energy Extraction Circuits.
- Engineering considerations of Energy Extraction system including power circuit, energy absorbing resistors and high current switches.
- Detail design of 10kA...
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Tiina-Mari Salmi (Tampere University)05/06/2023, 17:40
In the design and use of superconducting magnets one must always ensure the safe dissipation of the stored magnetic energy after a quench. External energy extraction is relatively simple to implement, and it has the advantage of dissipating the energy outside of the cryostat. However, it’s capacity is limited by the maximum allowed voltage across the magnet terminals, which limits the dump...
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Dr Emmanuele Ravaioli (CERN)06/06/2023, 16:30
About the lecture:
Coupling-Loss Induced Quench (CLIQ) is a quench protection method for superconducting magnets developed at CERN, which relies on a capacitive discharge unit introducing an oscillation of the transport current in the superconducting cable of the coil. The resulting fast change of the local magnetic field introduces a high coupling-current loss, which, in turn, causes a...
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Dr Tim Mulder (CERN)06/06/2023, 17:40
About the lecture:
The course will cover various aspects of quench detection and protection for HTS. These include the methods used to detect quenches in HTS, the types of quench protection systems commonly used, and any challenges or limitations associated with these systems.
About the speaker:
Tim Mulder did his PhD in ATLAS magnet group at CERN via the University of Twente on the...
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Hugo Bajas (EPFL)07/06/2023, 16:30
About the lecture:
This course is dedicated to the use of fiber optic sensors (FOS) as novel quench detection systems in superconducting coils. The various existing techniques (Fiber Bragg Grating, Rayleigh scaterring, etc...) will be presented together with their different working principles. A focus will be made on Fiber Bragg Grating technology giving the details on the constituve...
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Michael Guinchard (CERN)07/06/2023, 17:40
About the lecture:
High-energy accelerator or detector projects demands a sustained R&D effort to implement advanced technologies for the development of a new generation of superconducting magnets, high-energy proton beam dumps, powerful particle physics detectors and cryogenic radio-frequency cavities. During the research and developments phases, mechanical measurements is paramount to...
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Ken-ichi Sasaki (KEK)08/06/2023, 16:30
About the lecture:
Magnetometers are the most important tools for accurately evaluating the performance of superconducting magnets. A magnetic field at any point in the space is a vector quantity, meaning that measuring the magnetic field requires knowledge of both its direction and strength. However, there is no single magnetometer that can measure magnetic field vectors with high accuracy...
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Lucio Fiscarelli (CERN)08/06/2023, 17:40
About the lecture:
Magnetic measurements are required throughout all the development phases of superconducting magnets: from short models and prototypes to series units both at ambient and cryogenic temperature. Depending on the measurement requirements and on the test conditions, different instruments are exploited.
In this talk the instruments typically used for the magnetic...
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Maxim Marchevsky (LBNL)09/06/2023, 16:30
About the lecture:
High-field superconducting magnets operate during operation and exhibit transient releases of elastic energy associated with epoxy cracking or conductor motion. These events cause premature magnet quenching and training. Acoustic emission (AE) diagnostics is a unique way of probing transient magnet mechanics in a non-invasive way. It allows for measuring mechanical energy...
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Patryk Dawid Jankowski (CERN)09/06/2023, 17:40
The LHC superconducting magnet test benches controls were designed in 1996. They were based on VME data acquisition systems, Siemens PLCs control and interlocks systems. After a review of renovation of superconducting laboratories at CERN in 2009, it was decided to replace the VME systems with a PXI based systems and the ageing Sun/Solaris workstations with Linux PC’s. This lecture covers the...
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Jean-Luc Duchateau (CEA)12/06/2023, 16:30
About the lecture:
Quench protection in fusion magnets is based on external energy extraction, due to the large stored energy. The external resistor system is arranged such as to adjust the maximum voltage to the ground to an acceptable level.
The quench propagation is slowed down due to the helium circulating in the cable in conduit, classically used in fusion magnets.
The quench...
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Davide Uglietti (EPFL)12/06/2023, 17:40
About the lecture:
The course tries to summarise over 60 years of theory and experiments on AC losses in LTS and HTS magnets. The participants will learn definitions, where to find and how to use analytical tools for loss calculations. The course provides a list of references (past courses, publications and books) for deeper studies and further reading. Several examples for both low and...
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