In addition to Plenary Sessions, the meeting will have Parallel WG Sessions. If you would like to contribute a WG presentation, please contact WG conveners.
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WG-1: Latest Activities on High-G and High-Q Performances
Conveners: Peng Sha (IHEP), Marc Wenskat (DESY), Pashupati Dhakal (JLAB).
The scope of this working group is to discuss the latest results related to increasing cavity performances 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. In particular, comparison between cavity performances with Mid-T Bake in vertical tests and its operational experience in cryomodules should be discussed.
Topics should also include the activities on large and medium grain niobium materials including cavity performance results. The recent progress on Nb thin-film technologies, alternative materials beyond Nb like Nb3Sn, NbTiN and MgB2, and multi-layers should be presented. The working group should also focus on the advances in theoretical approaches, and innovative diagnostic equipment to understand fundamental mechanisms. -
WG-2: Field Emission and Its Root Causes
Conveners: Sebastian Aderhold (SLAC), Kensei Umemori (KEK), Stephane Berry (CEA).
Development of mitigation methods of field emission in SRF cryomodules is one of the crucial technologies for stable beam operation at high gradients. The scope of this working group is to present and discuss suppression/mitigation of field emission and understanding of the root causes of field emission. The results of statistical on-set levels (and time evolution) of x-ray radiations in large-scale cryomodule production projects like FRIB, RAON, E-XFEL, LCLS-II, SHINE, etc. should be presented and discussed to understand our current technical levels of field emission free performances.
Topics should include the advanced clean assembly with robot-assisted techniques, in-situ cleaning techniques in cryomodules (i.e. plasma processing and Ozone-gas processing) and studies of particle migration and migration suppression techniques. Systematic radiation detection systems and evaluation of radiation limit levels should be presented and discussed. Special surface preparation methods to suppress field emission and novel diagnostic equipment for searching root causes of field emission should also be discussed. -
WG-3: Operational Aspects and Experiences in High-Q and High-Current Cryomodules
Conveners: Michiru Nishiwaki (KEK), Julien Branlard (DESY), Ryan Porter (SLAC)
The WG-3 scope is to present and discuss key issues associated with High-Q cryomodules for high duty-cycle SRF Linacs and High-Current cryomodules for circular SRF accelerators. For the High-Q cryomodules, topics should include:
1. Operational aspects related to precise LLRF control and suppression of microphonics.
2. Sensitivity of Q-values due to flux trapping and cool-down speeds.
3. Evaluation and measurement of static and dynamic heat loads.
For the High-Current cryomodules, topics should include:
1. Operational experiences under heavy beam loading including LLRF control.
2. Experiences with high HOM power damping.
Topics should also include understanding the limiting mechanisms in cryomodule operation and degradation of cavity performances during beam operation. Operational experience with field emission and multipacting in operating facilities should be discussed. -
WG-4: Special Cryomodules and Advanced Auxiliary Systems
Conveners: Hongtao Hou (SARI), Crispin Contreras (Fermilab), Alan Wheelhouse (STFC)
The scope of this working group is to present and discuss special SRF cryomodules like SRF-gun modules, third-harmonic cavity modules, and deflecting-cavity modules. The SRF performances of the cavities and cryomodules and lessons learned in cryomodule operation should be presented and discussed.
Topics in WG-4 should include advanced auxiliary systems like fundamental high-power couplers, novel frequency tuners, cathode exchange tooling, high-power HOM couplers, beam-pipe HOM absorbers, beam alignment considerations and special RF feedthroughs. Development of the key components and issues in the design and operational experiences should be discussed. -
Special Seminar-1
"Science with Rare Isotopes: Unlocking the Door to the Invisible World",
Presenter; Prof. Seonho Choi (Department of Physics & Astronomy, Seoul National University) -
Special Seminar-2
"Axion research activities in Korea"
Presentor; Dr. SungWoo Youn (IBS-DMAG, IBS Dark Matter Axion Group)
