| Paper | Title | Page |
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| TUP104 | Improvement of a Clean Assembly Work for Superconducting RF Cryomodule and Its Application to the KEK-STF Cryomodule | 721 |
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We usually encountered the degradation of the superconducting RF cavities on the cryomodule test even though the performance of these cavities was good on the vertical test. In reality, the degradation of Q-values of two cavities of cERL main-linac were observed after cryomodule assembly in KEK [1] and STF cryomodule also met the degradation after the cryomodule assembly [2]. Some dusts and invisible particles might enter the cavity and generate field emission during the assembly work. Field emission is the most important cause of this degradation. In this paper, first we introduce some trials for the improved clean assembly work to SRF cavity by re-examining our clean assembly work and vacuum work. For example, slow pumping system with vacuum particle monitor was developed to know and control the particle movement during slow pumping and venting. Next we show the application of this improved work to the STF re-assemble cryomodule work in KEK.
[1} H. Sakai et al., SRF’13, Paris, France, p.855, 2013. [2] Y. Yamamoto et al., IPAC’16, Busan, Korea, p.2158, 2016. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP104 | |
| About • | paper received ※ 20 June 2019 paper accepted ※ 30 June 2019 issue date ※ 14 August 2019 | |
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| TUP105 | Preparation of the Cryomodule Assembly for the Linear IFMIF Prototype Accelerator (LIPAc) in Rokkasho | 726 |
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| The staged installation and commissioning of LIPAc is ongoing at Rokkasho Fusion Institute of QST, Japan for validating the low energy section of the IFMIF deuteron accelerator up to 9 MeV. The LIPAc Superconducting Radio Frequency accelerator (SRF) cryomodule is assembled under the responsibility of the EU Home Team, and the assembly work recently started at Rokkasho in March 2019. To fulfil the cleanliness requirements for the assembly process, QST took the responsibility to prepare the infrastructure of a cleanroom and associated devices. In this present paper, the details of the preparation work for the cryomodule assembly made by QST will be presented. | ||
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Poster TUP105 [2.116 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP105 | |
| About • | paper received ※ 17 June 2019 paper accepted ※ 01 July 2019 issue date ※ 14 August 2019 | |
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| WETEA3 | Status of the IFMIF/EVEDA Superconducting Linac | 735 |
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| The IFMIF accelerator aims to provide an accelerator-based D-Li neutron source to produce high intensity high energy neutron flux to test samples as possible candidate materials to a full lifetime of fusion energy reactors. A prototype of the low energy part of the accelerator (LIPAc) is under construction at Rokkasho Fusion Institute in Japan. It includes one cryomodule containing 8 half-wave resonators (HWR) operating at 175 MHz and eight focusing solenoids. The talk will cover the progress of developments in the IFMIF/EVEDA cryomodule: the qualification of 8 cavities, the RF conditioning results of 8 high-power couplers, the manufacturing and test of the 8 superconducting solenoids and the equivalent operational equivalent tests performed at Saclay. The assembling status of the cryomodule at Rokkasho site will also be presented. | ||
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Slides WETEA3 [11.091 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-WETEA3 | |
| About • | paper received ※ 20 June 2019 paper accepted ※ 29 June 2019 issue date ※ 14 August 2019 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |