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Silicon Detector System for X-Ray Pulse Calorimetry of Laser-Produced Plasmas*

  • J. H. McQuaid (a1), C. E. Violet (a1) and J. Petruzzi (a1)

Abstract

The instrumentation for measuring x-ray yields from laser produced plasma is described. This new type of calorimeter is composed of a silicon detector, a charge-sensitive preamplifier and an analog-to-digital readout scheme for multiplexing up to ten detector outputs.

X-rays interacting with the detector produce hole-electron pairs in proportion to the total energy lost in the detector (∼1012 eV). In this application the detector can be characterized as a solid-state ionization chamber. The detector signal is coupled to a charge-sensitive preamplifier which generates a voltage pulse proportional to the x-ray energy absorbed. In this way the x-ray energy is measured by “direct conversion” rather than measuring the temperature rise due to an energy flux.

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This work was performed under the auspices of the U.S. Atomic Energy Commission and by the Defense Nuclear Agency.

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References

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1. Violet, C. E., Petruzzi, J., McQuaid, J. H., Boster, T. A., Richards, L. M., Mead, S. W., Saroyan, R. A., and Swain, J. E., “X-Ray Calorimetry of Laser-Produced Plasmas,” this issue.
2. Slivinsky, V. W., “Superthermal Electron Distributions in Laser-Produced Plasmas,” Lawrence Livermore Laboratory report UCRL-75465 (1974).
3. Taroni, A., Zanavini, G., “Plasma Effects and Charge Collection Time in Solid State Detectors,” Nucl. Instr. and Meth. 67, 277282 (1969).
4. Alberigi Quaranta, A., Taroni, A., Zanarini, G., “Plasma Time in Semiconductor Detectors,” IEEE Trans. Nucl. Sci., NS-15, 373 (1968).
5. Malm, H. L., Ravdorf, T. W., Martini, M., Zanio, K. R., “Gamma Ray Efficiency Comparisons for Si(Li). Ge, CdTe, and Hg l2 Detectors,” IEEE Trans. Nucl. Sci., NS-20, 500-509 (1973).

Silicon Detector System for X-Ray Pulse Calorimetry of Laser-Produced Plasmas*

  • J. H. McQuaid (a1), C. E. Violet (a1) and J. Petruzzi (a1)

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