Journal Article

PUBDB-2019-02388

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An X-ray gas monitor for free-electron lasers

Sorokin, A. A. (Corresponding author)DESY* ; Bican, Y.DESY* ; Bonfigt, S.DESY* ; Brachmanski, M.DESY* ; Braune, M.DESY* ; Jastrow, U. F.DESY* ; Gottwald, A.Extern* ; Kaser, H. ; Richter, M.Extern* ; Tiedtke, K. (Corresponding author)DESY*

2019
Wiley-Blackwell Chester

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Please use a persistent id in citations: doi:10.1107/S1600577519005174  doi:10.3204/PUBDB-2019-02388

Abstract: A novel X-ray gas monitor (XGM) has been developed which allows the measurement of absolute photon pulse energy and photon beam position at all existing and upcoming free-electron lasers (FELs) over a broad spectral range covering vacuum ultraviolet (VUV), extreme ultraviolet (EUV) and soft and hard X-rays. The XGM covers a wide dynamic range from spontaneous undulator radiation to FEL radiation and provides a temporal resolution of better than 200 ns. The XGM consists of two X-ray gas-monitor detectors (XGMDs) and two huge-aperture open electron multipliers (HAMPs). The HAMP enhances the detection efficiency of the XGM for low-intensity radiation down to 10$^5$ photons per pulse and for FEL radiation in the hard X-ray spectral range, while the XGMD operates in higher-intensity regimes. The relative standard uncertainty for measurements of the absolute photon pulse energy is well below 10%, and down to 1% for measurements of relative pulse-to-pulse intensity on pulses with more than 10$^{10}$ photons per pulse. The accuracy of beam-position monitoring in the vertical and horizontal directions is of the order of 10 µm.

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Contributing Institute(s):

1. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)
2. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)
3. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)
2. 6G2 - FLASH (POF3-622) (POF3-622)

Experiment(s):

1. FLASH II Beamline FL24 (FLASH II)
2. FLASH: FEL user facility and Photon Diagnostics

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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