Abstract
A simple power supply and control electronic system to operate microchannel plate (MCP) detectors for imaging transient events such as X-ray emission from laser-produced plasmas is described. The power supply consists of two parts, viz. a high voltage pulse generator of 1 kV amplitude with a variable pulse duration of 100 µs to 1 ms for the MCP input, and a regulated 5 kV d.c. for biasing the phosphor screen. The control unit synchronizes the high voltage pulse with the event and operates a safety switch to guard the detector against any accidental rise in the background pressure. A signal-to-noise ratio ≥ 75 is obtained, limited by the noise contribution of the Charge Coupled Device (CCD)-frame grabber combination attached to the MCP. The system is compact, has provision for both positive and negative pulses, is extendable to higher voltages for operating two-stage MCP, and is immune to electromagnetic interference.
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References
Hamamatsu Technical Manual 1987 Characteristics and application of microchannel plates. RES-0795 & T-114
Morgan B L (ed.) 1985Photoelectronic images devices (London: Academic Press)
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Upadhyay, J., Bundel, H.R., Chandra, R. et al. A simple power supply and control unit for pulsed operation of a microchannel plate imaging detector. Sadhana 24, 235–243 (1999). https://doi.org/10.1007/BF02745804
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DOI: https://doi.org/10.1007/BF02745804