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Development of a Pencil-Type Single-Shield Graphite Quasi-Adiabatic Calorimeter and Comparison of Its Performance with a Double-Shield Graphite Calorimeter for the Measurement of Nuclear Heat Deposition Rate in a Fusion Environment

O. P. Joneja, M. Rosselet, J. Ligou, P. Gardel

Fusion Science and Technology / Volume 28 / Number 4 / Pages 1651-1662

November 1995


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Recently, heat deposition rate measurements were reported that used a quasi-adiabatic double-shield graphite calorimeter. It was found that for a better understanding of nuclear heating due to incident radiation, having a calorimeter that could be conveniently moved axially and radially inside large material blocks would be advisable. Here, a simpler design, based on three elements, i.e., core, jacket, and shield is conceived. The fabrication and testing details are presented, and the performance of the current calorimeter is compared with a double-shield calorimeter under similar conditions. Such a system is found to be extremely sensitive and can be employed successfully at the LOTUS facility for future nuclear heat deposition rate measurements in large blocks of materials. The current design paves the way for the convenient testing of a large amount of kerma factor data required for constructing future fusion machines. The same configuration with minor changes can be extended to most of the fusion materials of interest. The core of the new calorimeter measures 11 mm in diameter and height and has overall dimensions of 24 mm in diameter and 180 mm in height. The response of the calorimeter is measured by placing it in front of the Haefely neutron generator. The reproducibility of these measurements is found to be better than 2.7% for a dose rate in the range of 30 to 100 cGy/min. The heating rates are found to vary linearly with the neutron source strength.

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