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RIS citation export for TUPO029: Highlights of the XM-3 Cryomodule Tests at DESY

AU  - Branlard, J.
AU  - Ayvazyan, V.
AU  - Bellandi, A.
AU  - Cichalewski, W.
AU  - Eschke, J.
AU  - Gumus, C.
AU  - Kostin, D.
AU  - Przygoda, K.P.
AU  - Schlarb, H.
AU  - Sekutowicz, J.K.
ED  - Schaa, Volker RW
ED  - Pei, Guoxi
ED  - Chin, Yong Ho
ED  - Fu, Shinian
ED  - Zhao, Ning
TI  - Highlights of the XM-3 Cryomodule Tests at DESY
J2  - Proc. of LINAC2018, Beijing, China, 16-21 September 2018
CY  - Beijing, China
T2  - Linear Accelerator Conference
T3  - 29
LA  - english
AB  - To investigate the feasibility of the continuous wave (cw) upgrade of the European XFEL (E-XFEL) DESY, on-going tests are performed on E-XFEL prototype and production cryomodules since 2011. For these studies, DESY’s Cryo-Module Test Bench (CMTB) has been equipped with a 10⁵ kW cw operating IOT in addition to the 10MW pulsed klystron, making CMTB a very flexible test stand, enabling both cw and pulse operation. For these tests, E-XFEL-like LLRF electronics is used to stabilize amplitude and phase of the voltage Vector Sum (VS) of all 8 cavities of the cryomodule under test. The cryomodule most often tested is the pre-series XM-3, unique since it is housing one fine grain niobium and seven large grain niobium cavities. In autumn 2017, additional spacers were installed on all 8 input couplers to increase the maximum reachable loaded quality factor Ql beyond 2·10⁷. With higher Ql, up to 6·10⁷ for 6 cavities and 2.7·10⁷ for 2 cavities, we have investigated the VS stability and SRF-performance of this cryomodule under various conditions of cooling down rate and operation temperature 1.65K, 1.8K and 2K, at gradients up to ca. 18MV/m. The results of these tests are presented in this paper.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 388
EP  - 390
KW  - cavity
KW  - cryomodule
KW  - operation
KW  - feedback
DA  - 2019/01
PY  - 2019
SN  - 2226-0366
SN  - 978-3-95450-194-6
DO  - DOI: 10.18429/JACoW-LINAC2018-TUPO029
UR  - http://jacow.org/linac2018/papers/tupo029.pdf
ER  -