Radio-controlled xenon flashers for atmospheric monitoring at the HiRes cosmic ray observatory
1999
Stable, robust ultraviolet light sources for atmospheric monitoring and calibration pose a challenge for experiments that measure air #uorescence from cosmic ray air showers. One type of light source in use at the High Resolution Fly’s Eye (HiRes) cosmic ray observatory features a xenon #ashbulb at the focal point of a spherical mirror to produce a 1 ls pulse of collimated light that includes a strong UV component. A computer-controlled touch tone radio system provides remote operation of bulb triggering and window heating. These devices, dubbed ‘#ashersa, feature stand-alone operation, $5% shot-to-shot stability, weather proof construction and are well suited for long-term"eld use. This paper describes the #ashers, the radio control system, and a 12-unit array in operation at the HiRes cosmic ray observatory ( 1999 Elsevier Science B.V. All rights reserved.
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