研究目的
To study the noise behavior of SiPMs after high neutron irradiation at low temperatures, comparing standard and low internal electric field devices from different manufacturers, and investigating annealing effects.
研究成果
The research demonstrates that low internal electric field SiPMs exhibit better noise performance, especially at lower temperatures, with Hamamatsu HE SiPM showing the best temperature coefficient. Annealing reduces current by a factor of three without side effects, suggesting benefits of room temperature storage during shutdowns. Future work should focus on further reducing SiPM gain and optimizing electric field shaping for higher irradiation tolerance.
研究不足
The study is limited to specific SiPM models and irradiation conditions; results may not generalize to all SiPM types. Saturation effects at high over-voltages and temperatures were observed, potentially affecting accuracy. Annealing studies were conducted on a limited set of samples.
1：Experimental Design and Method Selection:
The study involved irradiating SiPM samples to specific neutron doses and measuring their noise characteristics at various temperatures. Theoretical models for trap-assisted tunneling and Poole–Frenkel effect were considered. Methods included pulsed LED analysis and leakage current measurements.
2：Sample Selection and Data Sources:
SiPM samples from FBK-irst (NUV type, standard field and low field) and Hamamatsu (S10943-4732, HE SiPM) were used. Irradiations were performed at the TRIGA reactor at JSI in Slovenia and the CHARM facility at CERN.
3：List of Experimental Equipment and Materials:
Equipment included a climate chamber for temperature control, Peltier cooler, and facilities for irradiation (TRIGA reactor, CHARM facility). Materials were SiPM devices from FBK-irst and Hamamatsu.
4：Experimental Procedures and Operational Workflow:
Samples were irradiated to doses of 2e12 and 5e13 n/cm2, kept cold to avoid annealing, and measured at temperatures from +10°C to -40°C. Leakage current, gain, and noise (ENC) were measured. Annealing was performed at 70°C for accelerated studies.
5：Data Analysis Methods:
Data were analyzed to determine noise levels, temperature coefficients, and annealing factors. Fits were applied to current vs. temperature data, disregarding saturated points.
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