If you want to contribute to a Working Group, please contact WG conveners
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WG-1: Latest Activities on High-G and High-Q Performances
Conveners : TBD
The scope of this working group is to discuss the latest results related to increasing cavity performance towards higher Q and higher gradient. Advances in understanding the latest vertical test performances with N-doping, N-infusion, Mid-T bake, and Two-step low-T bake should be discussed. Sample studies that help explain rf performance should be reported including novel sample characterization for deeper understanding. Topics should also include the activities on large and medium grain niobium materials including cavity performance results. The working group should also focus on the advances in theoretical approaches including the incorporation of thin films to enhance niobium performance.
Keywords: bulk niobium, high Q, high G, doping, heat treatments, sample studies, sample diagnostics, large grain, medium grain, Nb surface engineering, theoretical approaches
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WG-2: Effective operation of aging machines for performance and reliability
Conveners : TBD
For operating SRF accelerators the initial performance may have degraded due to gradual decay (field emission, magnetic pollution, poor vacuum, …) or singular perturbations (component failure, vacuum/cryo accidents). Maintaining performance to meet science needs may involve upgrading protocols or developing new mitigation methods but also could dictate upgrades in equipment to retain or boost performance. This working group should concentrate on methods and techniques used in operating SRF accelerators to retain or boost performance through various means such as HPP processing, helium processing, plasma processing and Ozone-gas processing, thermal cycling, reconfiguration, reprocessing. The working group should also include the developments towards the understanding and suppression of sources of degradation.
Keywords: operating accelerators, performance degradation, in-situ processing techniques, sources of degradation
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WG-3: R&D for Mass production and Quality assurance for accelerator modules
Conveners : TBD
Large scale SRF projects require mass production of parts with reliable outcomes that meet specifications with high yield. In turn, assembly and processing techniques and procedures as well as personnel training need to be of sufficient standard to produce sub-assemblies and final cryomodules that meet specification with a high likelihood of success. This working group should focus on the challenges behind the production of components like tuners, couplers (FPC, HOM) and cavities that meet project specifications and the subsequent assembly of those components into finished modules that meet project goals. Of interest will be the rationale behind choosing design margins, the assumed yield in component/cavity production, the expectation in terms of cavity performance in the test cryostat vs cavity performance in the cryomodule on-line. Difficulties in achieving project performance or yield goals are of major interest.
Keywords: mass production, performance yield, quality assurance, production difficulties, repeatability, supply chain, design margins
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WG-4: R&D challenges for future advanced projects
Conveners : TBD
Future SRF projects will face challenges that include efficient production, new cavity shapes, new rf frequencies, high beam currents, power efficiency demands and demands on resonance control, customized processing (HPR…) and robotic assembly for field emission free systems. Muon colliders will face beam induced radiation through muon decay that may have adverse effects on cavity performance. High intensity applications in colliders will require HOM and FPC development. Technologies like Nb/Cu are being considered for mass industrial production but will require development to reliably reach high gradients and competitive Q. Nb3Sn is being considered to reduce the cost of cryogenics in cw applications both for leptons and hadrons. However, Nb3Sn requires significant development for repeatable performance and successful application on various cavity shapes. Incorporation of Nb3Sn into multi-cavity cryomodules also presents major challenges. R&D is also being pursued at the sample and cavity level using thin films to further engineer bulk Nb surfaces and enhance their performance. This working group will discuss the R&D that is focused to push beyond current state-of-the art and towards future projects and applications.
Keywords: Field emission prevention, producing field emission systems, robotics development, Nb/Cu performance, Nb/Cu industrialization, Nb3Sn production, Nb3Sn operation, thin film R&D, muon colliders, advanced FPC HOM couplers, advanced tuners
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Hot Topics : Developing SRF towards Turn-Key Industrial Systems
Conveners : TBD
The landscape of SRF technology is shifting beyond large instruments, specifically with advances with Nb3Sn and conduction cooling, enabling the perspective of SRF-based standalone industrial machines. However significant developments remain for repeatable production of consistent Nb3Sn performance, successful application on various cavity shapes and for successful integration into compact, high-duty-cycle accelerators. The discussion should address the critical R&D and engineering required to move from promising R&D into a mainstream technology for the next generation of cryomodules. This session should also focus on the "vulgarization", or the strategic democratization, of SRF technology by transitioning from specialized laboratory physics to robust, mainstream industrial engineering. The hot-topic session should address the roadmap for making SRF "plug-and-play." What are the standardizations and simplifications that would be required to allow for industrialization and operation by non-specialist technicians in non-laboratory environments.
Keywords: Nb3Sn, SRF Industrial applications, conduction cooling, road-map, strategic democratization, mainstream acceptance, turn-key
