Journal
JOURNAL OF INSTRUMENTATION
Volume 3, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1748-0221/3/02/P02003
Keywords
instrumentation for FEL; vacuum-based detectors; gaseous detectors; interaction of radiation with matter
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Since the summer of 2005, the vacuum ultra-violet Free-electron LASer in Hamburg (FLASH) has operated as a user facility at the Deutsches Elektronen-Synchrotron (DESY), delivering ultra-short laser pulses of tens of femtosecond duration with a high peak brilliance of up to 10(28) photons/(smm(2) mrad(2) 0.1% bandwidth). Due to the statistics of the Self-Amplified Spontaneous Emission (SASE) process, each photon pulse differs from the previous one in the number of modes per pulse, the wavelength (0.5% fluctuations) and the intensity, making experiments more complicated. Thus, for certain experiments the detailed knowledge of the beam properties on a shot-to-shot basis is mandatory. In this paper we describe an online method to gain spectral information about the individual Free-Electron Laser (FEL) pulses that is based on rare-gas photoionization and photoelectron spectroscopy.
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