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RIS citation export for TUPO071: Study on Nitrogen Infusion for 1.3 GHz SRF Cavities Using J-PARC Furnace

AU  - Umemori, K.
AU  - Dohmae, T.
AU  - Egi, M.
AU  - Hori, Y.
AU  - Kako, E.
AU  - Kamiya, J.
AU  - Konomi, T.
AU  - Kurosawa, S.
AU  - Michizono, S.
AU  - Okada, T.
AU  - Saeki, T.
AU  - Sakai, H.
AU  - Takeishi, K.
AU  - Yamamoto, Y.
ED  - Schaa, Volker RW
ED  - Pei, Guoxi
ED  - Chin, Yong Ho
ED  - Fu, Shinian
ED  - Zhao, Ning
TI  - Study on Nitrogen Infusion for 1.3 GHz SRF Cavities Using J-PARC Furnace
J2  - Proc. of LINAC2018, Beijing, China, 16-21 September 2018
CY  - Beijing, China
T2  - Linear Accelerator Conference
T3  - 29
LA  - english
AB  - Nitrogen infusion (N-infusion) is new surface treatment technique for niobium SRF (Superconducting RF) cavities. After cooling down from 800 degree C heat treatment, a vacuum furnace and cavities are kept 120 degree C, 48 hours with about 3 Pa Nitrogen. Improvement of Q-value and accelerating gradient is expected. We used J-PARC furnace, since N-infusion procedure requires clean vacuum furnace. It has a cryo-pump and turbo molecular pumps and its vacuum system is oil-free system. Six times of N-infusion tests were carried out, while changing vacuum condition, N-infusion temperature, Nitrogen pressure, niobium material and so on. Niobium caps were mounted on cavities to avoid contaminations on inner surfaces. Some of trials were successful and vertical test results showed improvement of Q-values and accelerating gradient. However, some of them were not. Most of bad cases showed degradation of Q-values above 5 MV/m. Details of heat treatment procedure including N-infusion and vertical test results are shown in this presentation.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 499
EP  - 502
KW  - cavity
KW  - injection
KW  - background
KW  - vacuum
DA  - 2019/01
PY  - 2019
SN  - 2226-0366
SN  - 978-3-95450-194-6
DO  - DOI: 10.18429/JACoW-LINAC2018-TUPO071
UR  - http://jacow.org/linac2018/papers/tupo071.pdf
ER  -