Abstract
A magnetic core digitized spark chamber suitable for use on balloons and ultimately on satellites has been developed. The assembled spark chamber consists of 32 active spark modules and forms the heart of a gamma-ray telescope. The individual modules consist of two orthogonal wire grids which form the spark chamber electrodes. Inclusion of a terminating resistor on each wire localizes the effect of the discharge, resulting in good multiple spark efficiency at low overvoltages. The lower voltages result in better spatial resolution with fewer wires sharing the spark. In the construction, considerable care was given to strength and long term operation under satellite conditions. The on-board data-handling system consists of a buffered memory readout, a housekeeping multiplexer, a tape recorder and a telemetry encoder and transmitter.
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