Pulse-resolved intensity measurements at a hard X-ray FEL using semi-transparent diamond detectors

被引:12
作者
Roth, Thomas [1 ,6 ]
Freund, Wolfgang [1 ]
Boesenberg, Ulrike [1 ]
Carini, Gabriella [2 ]
Song, Sanghoon [2 ]
Lefeuvre, Gwenaelle [3 ]
Goikhman, Alexander [4 ]
Fischer, Martin [5 ]
Schreck, Matthias [5 ]
Gruenert, Jan [1 ]
Madsen, Anders [1 ]
机构
[1] European Xray Free Electron Laser Facil, Holzkoppel 4, D-22869 Schenefeld, Germany
[2] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA
[3] Micron Semicond Ltd, 85 Marlborough Rd, Lancing, England
[4] Immanuel Kant Baltic Fed Univ, Nevskogo 14, Kaliningrad 236041, Russia
[5] Univ Augsburg, Inst Phys, Univ Str 1, D-86159 Augsburg, Germany
[6] European Synchrotron Radiat Facil, Grenoble, France
关键词
XFEL; diamond detector; X-ray intensity measurement; CRYSTAL CVD-DIAMOND; FREE-ELECTRON LASER; PARTICLE DETECTORS; BEAM; SPECTROSCOPY; BREAKDOWN; MONITOR;
D O I
10.1107/S1600577517015016
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Solid-state ionization chambers are presented based on thin diamond crystals that allow pulse-resolved intensity measurements at a hard X-ray free-electron laser (FEL), up to the 4.5 MHz repetition rate that will become available at the European XFEL. Due to the small X-ray absorption of diamond the thin detectors are semi-transparent which eases their use as non-invasive monitoring devices in the beam. FELs are characterized by strong pulse-to-pulse intensity fluctuations due to the self-amplified spontaneous emission (SASE) process and in many experiments it is mandatory to monitor the intensity of each individual pulse. Two diamond detectors with different electrode materials, beryllium and graphite, were tested as intensity monitors at the XCS endstation of the Linac Coherent Light Source (LCLS) using the pink SASE beam at 9 keV. The performance is compared with LCLS standard monitors that detect X-rays backscattered from thin SiN foils placed in the beam. The graphite detector can also be used as a beam position monitor although with rather coarse resolution.
引用
收藏
页码:177 / 188
页数:12
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