KEK, Ibaraki, Japan
KEK, Ibaraki, Japan
KEK, Ibaraki, Japan
FRIXA01
KEK, Ibaraki, Japan
| Paper | Title | Page |
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| MOPMB033 | Efforts to Suppress Field Emission in SRF Cavities at KEK | 167 |
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| Our main objective is to achieve as high as possible quality factors Q₀ and maximal accelerating voltages Eacc within 1.3 GHz superconducting radio frequency (SRF) cavities. Beside an adequate surface treatment, key to achieve good performance is a proper assembly in the clean room prior cavity testing or operation. In this contribution we present the methods and results of our efforts to get a better understanding of our clean room environment and the particulate generation caused during the assembly work. Furthermore, we present the measures taken to suppress filed emission, followed by an analysis of vertical test results of the last six years. | ||
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Poster MOPMB033 [1.532 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB033 | |
| About • | Received ※ 14 June 2023 — Revised ※ 25 June 2023 — Accepted ※ 02 September 2023 — Issue date ※ 02 September 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TUPTB030 | Development of Automatic Cleaning and Assembly Systems in Clean Room at KEK | 463 |
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| At KEK, new clean work systems including vertical auto cleaning system, replacement system between blank flange and bellows, and robot arm have been developed and installed since 2020 under the collaboration between Japan and France. The main purpose is unmanned and dust-free operation in clean room to avoid performance degradation with field emission in vertical test and cryomodule test. The vertical auto cleaning system and the replacement system between blank flange and bellows have been operated successfully in 2021-2022. Currently, clean work studies related to auto cleaning and assembly is under progress by combining the blank-bellows replacement system and a robot arm. In this report, the recent status of clean works at KEK will be presented. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB030 | |
| About • | Received ※ 17 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 30 June 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| WEPWB098 | Development and Evaluation of STF-Type Power Coupler for Cost Reduction at the High Energy Accelerator Research Organization | 820 |
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| At KEK, cost reduction study for STF-type input power coupler used in the STF-2 accelerator has been attempted since FY2015. In FY2019, one coupler was fabricated by some cost-effective and non-conventional methods including different alumina-ceramic material, copper plating and TiN coating. In high power RF test at room temperature, this coupler achieved 1 MW at 900 µsec/5Hz, and 935 kW @1.65 msec/5Hz. After that, this coupler experienced 10 thermal cycle tests from room temperature to liquid nitrogen temperature without vacuum leakage. In this report, the detailed results will be presented. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB098 | |
| About • | Received ※ 17 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 02 July 2023 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
FRIXA01 |
Achievement of the ILC Milestone by Beam Operation of STF-2 Accelerator at KEK | |
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| The STF-2 accelerator with fourteen 9-cell superconducting cavities at KEK has achieved many milestones for the International Linear Collider (ILC) project since 2019. The main achievements are the beam acceleration at 33 MV/m with nine cavities, the max. beam energy of 384 MeV, the beam power of 6 kW, the beam operation with 5.8 mA per bunch (21.5 ¿A as the beam intensity), the beam emittance of 5 mm mrad, the Low-Level RF control to compensate with heavy beam loading, etc. On the other hand, in these cool-down tests, the performance of cavities has changed including the radiation level. In this talk, these achievements and experiences in the STF-2 accelerator will be presented. | ||
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Slides FRIXA01 [6.612 MB] | |
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