We have investigated the thermal behavior of a set of 40 mm, high strip current, microchannel plate (MCP) photomultipliers developed for a diagnostic system of a fusion plasma by laser scattering. These detectors include a V-stack of very low resistivity (5 × 10 6 ω m) microchannel plates and must be operated with a pulsed high voltage power supply under strict control of the temperature. Therefore the resistance of the V-stacks has been studied as a function of the MCP temperature and of the applied voltage by applying short pulses of high voltage to the detectors in a temperature comtrolled environment. At low applied voltage (approximately 1 V) a resistance of 2.05 × 10 6 ω was measured for one of the V-stacks, with a resistance coefficient of -1.47 × 10 4 ω/degree C. At high voltage the resistance was found to be lower by about a factor three and showed a linear decrease with both the MCP temperature and the applied high voltage. From these measurements the detector thermal capacitance and thermal conductivity were found to be 0.79 J/degrees C and 1.85 × W/degrees C respectively. The measured parameters are used in a simplified thermal model of the detectors for the construction of the pulsed power supply control system necessary to operate them in safe conditions.
|Publication status||Published - 1995|
|Event||Photoelectronic Detectors, Cameras, and Systems - , Unknown|
Duration: 1 Jan 1995 → …
|Conference||Photoelectronic Detectors, Cameras, and Systems|
|Period||1/1/95 → …|
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
- Condensed Matter Physics
Sardella, A., Bassan, M., Giudicotti, L., Lotto, L., & Pasqualotto, R. (1995). Thermal characterization of high strip current microchannel plate photomultipliers. Paper presented at Photoelectronic Detectors, Cameras, and Systems, Unknown.