Improvement of the UV laser calibration of high energy particle spectrometers

1992 
Abstract The simulation of straight particle trajectories in gas filled detectors by means of pulsed UV laser beams is widely used for the calibration of spectrometers in HE physics. The accuracy of such calibrations can be increased if the width of the laser beam — a few mm for long beams — and its longitudinal variation is known and taken into account. We study a method to unfold the actual width of the laser induced ionization profile directly from the shape of the detector pulse itself. This is done with the help of the detector response to a point charge which we measure using a strongly focussed laser beam. In a first step of our study we showed that the inverse procedure works well: convolution of measured beam profiles of “parallel” beams with the point charge detector pulse leads to predicted pulse shapes which agree perfectly with those of measured pulses.
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