Abstract
Light from an argon high stability laser is used together with an acoustic-optic modulator to provide constant energy calibration pulses to the photomultiplier tubes in an experimental setup. This solution is proposed as the most appropriate when many (up to one/two hundred) of PMTs must be monitored and controlled for gain stability. In our case, gain changes should be limited to 1% which means a still better reproducibility for both the intensity and the width of the calibrator light pulses. In this paper we motivate our choice, present a simple crystal controlled pulse generator which assures the required long-term width stability and give the results obtained in several experimental runs.
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