| Paper |
Title |
Page |
| TUPRB019 |
Collimator Performance Study at the European XFEL |
1717 |
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- S. Liu, F. Brinker, W. Decking, L. Fröhlich, N. Golubeva, T. Wamsat, J. Wilgen
DESY, Hamburg, Germany
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Beam halo collimation is of great importance for the high repetition rate operation at the European XFEL and for the future CW machines. At the European XFEL several different types of collimators are installed at different locations of the beam line, which include the gun collimators, the bunch compressor collimators, and the main and supplementary collimators in the collimation section. Beam halo measurements have been performed using the wire scanners downstream of the main linac, which show that large part of beam halo is collimated by the gun collimator. Remaining losses in the collimation section are mainly due to misalignment. Alignment using orbit bumps in the collimation section is performed and presented in this paper.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB019
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| About • |
paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 |
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| TUPRB020 |
Status of the European XFEL |
1721 |
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- W. Decking, F. Brinker, L. Fröhlich, R. Kammering, T. Limberg, S. Liu, D. Nölle, M. Omet, M. Scholz, T. Wamsat
DESY, Hamburg, Germany
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The European XFEL is a Hard X-ray Free Electron Laser based on superconducting accelerator technology. In operation since 2017, it now serves 3 FEL beamlines simultaneously for user experiments. We will report on the present operation of the linear accelerator, the beam distribution to the various beamlines and the performance of the FEL radiators.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB020
|
|
| About • |
paper received ※ 15 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019 |
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| TUPRB021 |
Undulator Radiation Dose Caused by Synchrotron Radiation at the European XFEL |
1724 |
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- S. Liu
DESY, Hamburg, Germany
- Y. Li, F. Wolff-Fabris
EuXFEL, Schenefeld, Germany
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Radiation damage of the undulators is a big concern for the light sources. At the European XFEL (EuXFEL), dosimeters based on on-line Radfets are used for the un-dulator radiation dose measurements. However, since the Radfets are not only sensitive to the electrons and neu-trons but also to the photons, it can capture the synchro-tron radiation (SR) generated in the undulators, which is not considered to be the main source for undulator radia-tion damage. Therefore, it is important to estimate the contribution of synchrotron radiation to the radiation doses measured by the Radfets. For this purpose, we have first calculated the synchrotron radiation profile using SPECTRA, and then put the profile into the tracking code BDSIM to track it through the whole undulator beam line. The radiation doses from SR have been simulated and compared with the measured values. The differences in the radiation doses measured by the Radfets before and after Pb shielding will also be presented.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB021
|
|
| About • |
paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 |
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reference for this paper using
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