Improved bolometry system for reversed field pinch research

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Abstract
A bolometry system for time and spatially resolved energy-loss measurements on the ZT-40M reversed-field pinch is described. This system allows ∼100-μs time resolution with a radiation detection limit of ∼100 mW/cm2 , in particularly noisy electromagnetic environments. The bolometer element fabrication using evaporative techniques and photolithography is discussed. Increased noise rejection is realized by using an oscillator/FM receiver electronics system based on 5-MHz ac excitation of the resistor. An improved oscillator is described. Because resistive sensing is done at 5 MHz, pulsed heating currents may simultaneously be passed through the bolometer resistor and this allows for absolute in situ system calibration. We describe a new method of such calibration that is independent of the resistor geometry.

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