Abstract
A detector system based on the photoionization of rare gases at low particle densities hasbeen developed for absolute photon flux measurements of highly intense andextremely pulsed radiation in the VUV and EUV spectral range. Due to its widedynamic range, the device can be calibrated with spectrally dispersed synchrotronradiation at low photon intensities but applied with high power sources. Thedetector is free of degradation and almost transparent, and therefore suitable forintensity monitoring. We describe here the application of the detector for fluxmeasurements at a beamline for undispersed deflected undulator radiation in the PTBRadiometry Laboratory at the electron storage ring BESSY II. In the single-bunchoperation mode of BESSY II, measurements of the pulse energy down to 3 nJfor single EUV pulses have been performed. This demonstrates the capabilityof the gas detector for a broad range of applications with pulsed EUV sources.
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