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Dr Mathieu Omet (High Energy Accelerator Research Organization (KEK))10/11/2026, 14:00Superconducting RF SystemsOral presentation (onsite)
Within the framework of the MEXT-ATD program and the ILC Technology Network (ITN), an ILC prototype cryomodule is currently under design and construction at KEK. It will incorporate eight superconducting 9-cell 1.3 GHz TESLA cavities. In parallel, the infrastructure required for cryomodule testing and operation is also being established. In this contribution, we report on the current status of...
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Dr Takafumi Hara (KEK)10/11/2026, 14:20Oral presentation (onsite)
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Eric Viklund (KEK)10/11/2026, 14:40Superconducting RF SystemsOral presentation (onsite)
The vertical test (VT) stand at the KEK Superconducting RF Testing Facility (STF) currently uses an analog RF control system. We are in the process of replacing this system with a new digital LLRF system based on the MicroTCA.4 architecture. The digital system also allows for greater flexibility regarding configurability and software automation. It is our goal to automate the VT process to...
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Dr Mathieu Omet (High Energy Accelerator Research Organization (KEK))10/11/2026, 15:00Superconducting RF SystemsOral presentation (onsite)
An ILC prototype cryomodule is currently under construction at KEK. It incorporates eight superconducting 1.3 GHz TESLA cavities. Precise setting and maintenance of the resonance frequency of these narrow-band cavities before and during operation require dedicated cavity tuners. The tuner design is based on the LCLS-II tuner. However, the specific requirements of the ILC prototype cryomodule,...
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Yasuchika Yamamoto (KEK)10/11/2026, 15:20
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Karl-Martin Schirm10/11/2026, 16:00Superconducting RF SystemsOral presentation (onsite)
The ITN-EU collaboration coordinates European activities for the development and industrialization of SRF cavities for the ILC, in close relation with KEK and international partners. The presentation will provide the latest status of the single-cell and 9-cell cavity activities, covering material qualification, fabrication, and surface treatment. The presentation will also outline the next...
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Elisa Del Core (INFN Milano - LASA)10/11/2026, 16:20Superconducting RF SystemsOral presentation (onsite)
Plasma processing is increasingly recognized as an effective technique for mitigating field emission and restoring the performance of superconducting radiofrequency (SRF) cavities. A collaboration among the Commissariat à l'énergie atomique et aux énergies alternatives (CEA), the European Spallation Source (ESS), the Fermilab (FNAL) and the Istituto Nazionale di Fisica Nucleare (INFN-LASA) is...
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Axel Perez Ruiz (Université Paris-Saclay, CNRS/IN2P3, IJCLab)10/11/2026, 16:40Superconducting RF SystemsOral presentation (onsite)
PERLE (Powerful Energy Recovery Linac for Experiments) is designed to demonstrate multi-turn, high-current operation of an Energy Recovery Linac (ERL). Achieving this demanding operating regime requires effective management of propagating higher-order-mode (HOM) power in order to limit beam instabilities and minimize the associated cryogenic heat load. The PERLE main cryomodule comprises four...
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Dr Cecilia Maiano (European Spallation Source)10/11/2026, 17:00Superconducting RF SystemsOral presentation (remote)
In this talk will be presented the technical commissioning of ESS superconducting linac, challenges and outcomes are presented
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Yasuchika Yamamoto (KEK)10/11/2026, 17:20
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Dr Junho Han (Kiswire Advanced Technology Co., Ltd.)11/11/2026, 14:30Superconducting RF SystemsOral presentation (onsite)
As a part of research for the manufacturing methods for SRF cavities used in ILC(International Linear Collider), collaborative research is conducted in the framework of the ITN(ILC Technology Network) which includes the Korea University and KEK. Following our previous study on 1.3 GHz single-cell niobium cavities, we have extended our manufacturing scope to full-scale 1.3 GHz 9-cell cavity for...
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Rui Ge (IHEP，CAS)11/11/2026, 14:50Superconducting RF SystemsOral presentation (onsite)
Energy recovery linac (ERL) based EUV-FELs are among the most promising candidate technologies for next-generation lithography. The development of a 10-mA high-current injector cryomodule for ERL-FELs has been initiated. The cryomodule consists of three 1.3 GHz 2-cell superconducting cavities, which are designed to accelerate 10 mA electron beam to 10 MeV. The cavities will receive the process...
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Seongjae Choi (Korea University)11/11/2026, 15:10Superconducting RF SystemsOral presentation (onsite)
This study presents the fabrication and room-temperature radiofrequency (RF) characterization of 1.3 GHz TESLA-type 9-cell copper prototype cavities as a preparatory step toward future niobium superconducting RF cavity development. Prior to fabrication, three-dimensional electromagnetic simulations were performed to evaluate the resonant frequency, TM010 passband characteristics, and axial...
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Dr MI ZHENGHUI (IHEP)11/11/2026, 15:30Oral presentation (onsite)
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Yasuchika Yamamoto (KEK)11/11/2026, 15:50
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Prof. Masashi YAMANAKA (KEK)11/11/2026, 16:30Superconducting RF SystemsOral presentation (onsite)
This talk introduces SRF cavity fabrication research at KEK over the past five years. The common objective is to reduce the cost of SRF cavities. The first topic is a Nb/Cu cavity in which the cavity body is made of copper and the inside is coated with niobium to induce superconductivity. The inner surface of the accelerating cavity must be smooth, and a seamless cavity is ideal as a base for...
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Dr Takeyoshi Goto (KEK)11/11/2026, 16:50Oral presentation (onsite)
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Hiroaki Umezawa (Tokyo Denkai Co., Ltd.)11/11/2026, 17:10Superconducting RF SystemsOral presentation (onsite)
Tokyo Denkai has supplied over 20000 fine grain (FG) niobium sheets for superconducting cavities for the European XFEL, LCLS-II, LCLS-II HE and SHINE projects. In this study, tensile test data obtained during mass production were statistically evaluated. Tensile strength, 0.2 % proof strength and elongation showed normal distributions. The minimum values estimated as the mean minus three...
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Dr Marco Voige (DESY)11/11/2026, 17:30Oral presentation (remote)
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Yasuchika Yamamoto (KEK)11/11/2026, 17:50
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Takeyoshi GotoSuperconducting RF SystemsPoster (onsite only)
he performance of niobium cavities used in superconducting accelerators is strongly governed by the morphology, chemical state, hydrogen content, and defects of the outermost surface region into which the electromagnetic field penetrates. The standard hydrofluoric acid–sulfuric acid electropolishing process has several problems, including high operational hazards and toxicity, as well as...
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Mr Marco Voige (DESY)Superconducting RF SystemsOral presentation (remote)
The combination of mid-T and subsequent low temperature heat treatments has been investigated as a means of improving SRF cavity performance [1]. These treatment combinations can retain high quality factors of up to 4·1010 obtained after mid-T treatment while enabling accelerating gradients up to 40 MV/m. Mid-T heat treatments are well known to increase the flux trapping sensitivity [2],...
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Daniel Bafia (Fermi National Accelerator Laboratory)Superconducting RF SystemsOral presentation (remote)
Recent work at Fermilab has focused on combining materials studies with RF characterization to better understand and extend the performance of niobium SRF cavities. This contribution will present recent results from impurity engineering and co-doping studies, developments in alternative cavity geometries, and progress toward reproducible high-Q and high-gradient performance. Particular...
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Dr Pashupati Dhakal (Jefferson Lab)Superconducting RF SystemsOral presentation (remote)
Superconducting radio-frequency (SRF) cavities with simultaneously high quality factor (Q₀) and high accelerating gradient are essential for the next generation of energy-efficient particle accelerators. Recent work at Jefferson Lab has demonstrated significant advances in cavity performance through optimized surface processing, with particular emphasis on medium-temperature (Mid-T) baking. We...
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Takafumi Hara (KEK)Superconducting RF SystemsOral presentation (onsite)
Under the MEXT Advanced Accelerator Element Technology Development (ATD) program, an International Linear Collider (ILC) cryomodule (CM) prototype is being designed and manufactured at KEK. The cryomodule consists of eight 9-cell superconducting cavities, frequency tuners, power couplers, a single-layer thermal shield, cooling pipes and a superconducting magnet. Along with cryomodule...
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Grigory Eremeev (Jefferson Lab)Superconducting RF SystemsOral presentation (remote)
Nb3Sn SRF cavity development is demonstrating the first operational accelerating cryomodules. The technology holds the greatest appeal to smaller-scale applications, which can benefit from the simplicity of a turn-key compact cryocooler operation, but will benefit large accelerators as well, if higher gradients, implied by Nb3Sn superheating field, can be reliably demonstrated. The progress in...
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Eric Lechner (Thomas Jefferson National Accelerator Facility)Superconducting RF SystemsOral presentation (remote)
Atomic force microscopy is used to compare the characteristic surface topographies of electropolished bulk Nb, Nb films deposited on Cu, and Nb3Sn. The role of defect geometry in magnetic field enhancement and superheating field suppression is examined using the London model. Although simple roughness metrics are widely used to assess superconducting radio frequency materials, these parameters...
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