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Title: Spectrometer for shot-to-shot photon energy characterization in the multi-bunch mode of the free electron laser at Hamburg

The setup and first results from commissioning of a fast online photon energy spectrometer for the vacuum ultraviolet free electron laser at Hamburg (FLASH) at DESY are presented. With the use of the latest advances in detector development, the presented spectrometer reaches readout frequencies up to 1 MHz. In this paper, we demonstrate the ability to record online photon energy spectra on a shot-to-shot base in the multi-bunch mode of FLASH. Clearly resolved shifts in the mean wavelength over the pulse train as well as shot-to-shot wavelength fluctuations arising from the statistical nature of the photon generating self-amplified spontaneous emission process have been observed. In addition to an online tool for beam calibration and photon diagnostics, the spectrometer enables the determination and selection of spectral data taken with a transparent experiment up front over the photon energy of every shot. This leads to higher spectral resolutions without the loss of efficiency or photon flux by using single-bunch mode or monochromators.
Authors:
;  [1] ;  [2] ; ; ; ;  [1] ; ;  [3] ; ;  [4] ;  [5]
  1. Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg (Germany)
  2. (DESY), Notkestraße 85, D-22607 Hamburg (Germany)
  3. Paul Scherrer Institute (PSI), Ch-5232 Villigen (Switzerland)
  4. Deutsches Elekronen Synchrotron (DESY), Notkestraße 85, D-22607 Hamburg (Germany)
  5. Institute for Physics, University of Rostock, Universitätsplatz 3, D-18051 Rostock (Germany)
Publication Date:
OSTI Identifier:
22482590
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAMS; CALIBRATION; DESY; ENERGY SPECTRA; FREE ELECTRON LASERS; KHZ RANGE; MONOCHROMATORS; PHOTONS; READOUT SYSTEMS; SPECTROMETERS; ULTRAVIOLET RADIATION; WAVELENGTHS