JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
@unpublished{bellandi:srf2021-mopfav001,
author = {A. Bellandi and J. Branlard and J. Eschke and Ç. Gümüş and D. Kostin and R. Onken and J.K. Sekutowicz and E. Vogel},
% author = {A. Bellandi and J. Branlard and J. Eschke and Ç. Gümüş and D. Kostin and R. Onken and others},
% author = {A. Bellandi and others},
title = {{Overview of CW R&D With a European XFEL Cryomodule}},
booktitle = {Proc. SRF'21},
% booktitle = {Proc. 20th International Conference on RF Superconductivity (SRF'21)},
intype = {presented at the},
series = {International Conference on RF Superconductivity},
number = {20},
venue = {East Lansing, MI, USA},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2022},
note = {presented at SRF'21 in East Lansing, MI, USA, unpublished},
abstract = {{Since 2011 a research and development program is carried out at DESY to study the feasibility of a possible Continuous-Wave (CW) upgrade of the European X-ray Free Electron Laser (XFEL). Cryo-Module Test Bench (CMTB) is a test facility at DESY used to perform tests with accelerating modules equipped with TESLA-type superconducting cavities. In this proceeding, the most recent tests at CMTB on module XM50.1 are presented. For the European XFEL upgrade, a key-importance question to answer is the cryomodules’ heat load when driven in CW. Therefore, tests at accelerating gradients up to 19 MV/m per cavity at 2K were carried to determine the cavities’ dissipated power. Operating at QLs > 10⁷ is also challenging for the LLRF: the narrow RF bandwidths involved require active online detuning disturbances rejection techniques. Therefore a new detuning estimator was developed. The estimator is also capable of working as a quench/multipacting detector. Tests on XM50.1 show that it is possible to estimate detuning disturbances with a sub-hertz precision and to catch multipacting events. Finally, the maximum achieved gradients with the module and after RF conditioning are presented.}},
}