Measurements of secondary scintillation in low-pressure CF4 with a SiPM, from a parallel-plate avalanche geometry

作者：Cortesi M^*; Yurkon J; Stolz A

来源：Journal of Instrumentation, 2016, 11(04): P04017.

DOI：10.1088/1748-0221/11/04/P04017

• Charge transport and multiplication in gas
• Charge transport
• multiplication and electroluminescence in rare gases and liquids
• Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

In this work we report and discuss the characterization of the secondary scintillation light emitted by low-pressure tetrafluoromethane (CF4) during avalanche gas processes. The experimental setup consists of a Parallel Plate Avalanche Counter (PPAC) irradiated by 5.5 MeV alpha particles from a collimated 241-Am source. The PPAC is operated in CF4 at pressures ranging from 5 to 50 torr. The electroluminescence light is readout by a VUV-sensitive Multi-Pixel Photon Counter (MPPC, Hamamatsu), placed along the PPAC axial direction. The secondary scintillation yield at different operational pressureswas computed from the correlation between avalanche charge and electroluminesce light, recorded on an event-by-event basis; it was found to be in the range of 0.01-0.15 photons/electron depending on the reduced field applied between the PPAC electrodes. The role of the quencher impurities is also briefly discussed. In addition, the coincidence resolving times (CRT) for 5.5 MeV alpha-particles crossing the PPAC has been measured; time resolutions of 600 picosecond were achieved at different pressures.

• 出版日期2016-4