Abstract: A failure simulation system utilizing fast failing units whereby system availability and reliability analysis can be completed in highly compressed periods of time. Each fast failing unit includes a random pulse generator and a variable failure rate pulse generator. Coincidence of pulses from the two generators signifies a unit failure. The pulse rate of the variable pulse generator is correlated to the probable time-dependent failure rate of the unit when new, as burned in, as aged, and as repaired. A one shot multivibrator responsive to unit repair resets the unit to an operational state after a determined repair time and adjusts the pulse rate of the variable pulse generator to correlate with a repaired unit. Deterministic and stochastic common mode inputs for each fast failure unit allow other units to either fail or accelerate failure, respectively, of the unit.

Abstract: A position sensitive detector including a curved detector housing having a hollow detector chamber therein, the housing having an elongate opening in the curved side wall thereof and an x-ray transmissive material adjacent thereto to render the detector chamber air-tight, a back cathode plane comprising a plurality of spaced cathode conductors on an insulator support and at least one curved anode wire, extending at least substantially transverse to the back cathode plane, disposed within the detector chamber in the path of x-rays entering through the elongate opening. Each anode wire, which is mechanically supported only at the ends thereof, is caused, during operation of the detector, to be supported in planar arcuate form solely by electrostatic forces. During operation of the detector, the chamber is filled with an ionizable gas and voltage is applied to the curved anode wire(s), thereby enabling detection of ionizing events occuring within the detector chamber.