A simple power supply and control unit for pulsed operation of a microchannel plate imaging detector

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 variabl e pulse duration of 100 mu s to 1 ms for the MCP input, and a regulated 5 k V d.c. for biasing the phosphor screen. The control unit synchronizes the h igh voltage pulse with the event and operates a safety switch to guard the detector against any accidental rise in the background pressure. A signal-t o-noise ratio greater than or equal to 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-st age MCP, and is immune to electromagnetic interference.