Fast rise-time calorimeter for relativistic electron beam diagnostics

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Abstract
A 10‐μsec rise‐time calorimeter using an infrared optical pyrometer for temperature measurement is described. The present equipment is suitable for pulsed high‐energy electron beam diagnostics in graphite targets over the range from 100 to 4000 J/g and includes provisions for temperature calibration and optical alignment. Measurement procedures and applications of the equipment are described. These applications include high‐speed energy absorption diagnostics and measurement of absorbed energy profiles versus target penetration. Improvements over conventional calorimetric dosimeter accuracy appear to be possible for some types of measurements with this approach. The present work demonstrates better than ±3% accuracy for measurement of absorbed energy in a series of experiments.