Abstract
We describe a gas proportional counter of 120 mm diameter employing two stages of charge amplification and utilising a Wedge and Strip Anode two dimensional position readout. The two stage gas amplification allows upper stage gain to be optimised for energy resolution which is further improved by the use of a Penning gas mixture. The second stage of amplification allows the overall gain to be high; a requirement for good spatial resolution. Thus optimal energy and position resolution can be obtained simultaneously. We present pre-flight performance data from the Penning Gas Imager [1] in conjunction with its flight electronics which are being prepared for inclusion in a sounding rocket experiment, the X-ray Objective Grating Spectrometer (XOGS) to be launched in mid-1988.
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