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HFM Working Groups are formed when experts from multiple institutes are active in the same field, or when a topic requires a joint effort by actors from different fields. The goal of WG meetings is to have comprehensive technical discussions and to enable collaboration that advances the attendants’ research.
The format and frequency of WG meetings may vary widely. Mini-workshops, online or in-person, may also be organized, as well as joint WG meetings by several WGs or by a magnet project and a WG.
WGs may be expanded to associated programs and projects to benefit from mutual synergies and avoid a duplication of topical meetings.
Researchers who intend to form/modify/close a Working Group should inform the Programme Leaders, respective RD Line coordinators, and the HFM Programme Office: hfm.programme.office@cern.ch
| WG Name | Description | Contact Person | CERN Box Folder | Mattermost Channel | Indico link | E-group |
| Insulation WG | Insulation systems for LTS and HTS magnets have to fulfill a number of requirements (electrical, mechanical, thermal, radiation-resistance, process ability, etc). The "Insulation Materials" working group brings together materials experts to develop and test various aspects of soft materials (epoxies, polyolefin, waxes, etc) and composites (fibre-reinforced, nanocomposites, etc.). The WGs participants optimize systems and processing techniques for use in specific contexts (high/low radiation, conduction/bath cooled, stress-managed/tightly-wound, high/low prestressed, etc.) and share their respective results and insights. Other topics within the scope of this working group include tribology on coil/structure interfaces (sliding planes) and bonding to structural components. | R. Piccin | Link to CERN Box | Mattermost link | Indico link | HFM-Insulation-Working-Group@cern.ch |
| Quench and Analysis of Transients WG | The analysis of transient events, such as quenches, ramp losses, and cooling dynamics, is essential for understanding and improving the performance and reliability of superconducting magnets. This working group addresses all aspects of transients, from numerical modelling and simulation to experimental measurements and hardware development. Topics include ramp-induced losses, cooling transients such as cooldown and recovery from a quench event, quench diagnostics and detection, and protection techniques. By fostering collaboration across multiple teams and laboratories, the group aims to unify methodologies, validate models through measurements, and advance hardware solutions to tackle transient phenomena effectively. | M. Wozniak, P. Borges De Sousa, G. Willering | Link to CERN Box | Mattermost link | Indico link | HFM-Quench-and-Analysis-of-Transients-Working-Group@cern.ch |
| Common-coils WG | Common coils designs for hadron colliders were studied in the US before they were the subject of magnet R&D for FCC-hh and SppC, and in the US-MDP 20-T hybrid study. In the "common coils" working group, we gather actors in ongoing common coils R&D for an open exchange on design challenges, in order to strengthen each of the participating institutes’ efforts. | D. Araujo | Link to CERN Box | Mattermost link | Indico link | HFM-Common-Coils-Working-Group@cern.ch |
| BOX Program | Fast-turnaround testing of powered samples in a background field can be a powerful tool in the search for innovative solutions to specific problems in magnet design. The BOX (BOnding eXperiment) sample has been a successful tool in the research for improved training performance in stress-managed LTS coils. The "BOX Program" working group further exploits BOX and related experimental setups, and continues to brainstorm novel sample concepts that may enable fast-turnaround research to improve magnet technology. | A. Kario, A. Brem |
Link to CERN Box | Mattermost link | Indico link | HFM-BOX-Program-Working-Group@cern.ch |
| Coil Composite WG | The Nb3Sn coil composite (strands, Rutherford cable, glass fiber, impregnant) is a daunting problem for predictive numerical analysis and magnet design. The "coil composite" working group strives to elaborate a consistent methodology that is based on experimental work and numerical analysis at multiple scales (strands/filaments, cables, cable stacks, coils). We seek to provide a measurement database and numerical models that: a) predict strand performance under stress; b) predict cable performance under stress; c) predict mechanical behavior of stacks/blocks of cables; d) can be efficiently implemented in 2D and 3D models, and that are validated by experiments on all different scales up to the final magnet. The scope of this working group may be extended to HTS coils in the future. | A. Haziot | Link to CERN Box | Mattermost link | Indico link | HFM-Coil-Composite-Working-Group@cern.ch |
| HTS Modeling WG | ReBCO tape conductor poses substantive challenges to numerical algorithms and tools to accurately capture electromagnetic/thermal transient phenomena such as screening currents, coupling currents, and quenches. Numerical tools are being developed in multiple HFM laboratories and institutes. The "HTS Modeling" working group brings together experts in numerical techniques in order to research stable and efficient algorithms to be implemented in design and analysis tools for HTS magnets. The initial focus of the working group is on electromagnetic and thermal behavior. Mechanical modeling may be treated here or in the "Coil Composite" working group - tbd. | B. Auchmann | Link to CERN Box | Mattermost link | Indico link | HTS-Modeling-Working-Group@cern.ch |
| ReBCO Coated Conductor WG | Accelerators magnets requiring up to 20 T central field necessitate superior electromagnetic and mechanical conductor properties. The "ReBCO Coated Conductor" working group brings together experts on conductor properties, tape characterization and qualification, as well as magnet design. The objective is to discuss avenues for conductor R&D, application-driven requirements, and quality assurance. Topics within the scope of this working group include, among others, critical current anisotropy and homogeneity at low temperatures (4.2 - 20 K) with their correlation to 77K self-field measurements, and conductor mechanical properties such as the de-lamination problem and measures for qualification and mitigation. | A. Ballarino et al. | Link to CERN Box | Mattermost link | Indico link | HFM-ReBCO-Coated-Conductor-Working-Group@cern.ch |
| HTS Design WG | HTS accelerator-magnet technology for FCC-hh still has to be developed and established Various aspects such as hybrid versus all-ReBCO designs, cable geometry, insulation and impregnation materials and procedures, coil shapes, winding/cabling processes, detection and protection methods, field quality, ramp losses, sustainability goals, mechanical structures, cryogenics concepts, powering and circuit protection, as well as the choice between background-field facilities and standalone magnet development, are all undergoing intense discussions and brainstorming across HFM laboratories and institutes. The "HTS Design" working group aims to structure these discussions and develop tangible milestones and deliverables over the course of one year, aligning them with the LDG Roadmap, which serves as the foundation of the HFM Program. | B. Auchmann, A. Ballarino | Link to CERN Box | Mattermost link | Indico link | HFM-HTS-Design-Working-Group@cern.ch |
| Block Coil WG | Nb3Sn block coil magnets have been studied extensively at LBNL, CERN, and CEA, with HD2 (LBNL) and FRESCA2 (CERN, CEA) as standard bearers for this technology. Currently, the design and construction of the TFD (Test Facility Dipole, US-MDP) is under way, and CEA is developing R2D2, FD, and F2D2 on their roadmap towards a graded single-aperture block coil magnet with FCC-hh specifications. CERN is developing BOND, a single-aperture, followed by a double-aperture block coil with FCC-hh specifications. The "Block-Coil WG" pools the experience gained by the different laboratories over recent decades, enabling each team to benefit from shared lessons learned from their respective designs in progress. | S. Izquierdo Bermudez, J. C. Perez |
Link to CERN Box | Mattermost link | Indico link | HFM-Block-Coil-Working-Group@cern.ch |
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