Year
2018
Abstract
Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:\"Table Normal\"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:\"\"; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin;} New-generation silicon photomultipliers (SiPMs) have been shown to be suitable replacements for traditional photomultiplier tubes (PMTs) in a variety of applications in which the compactness, ruggedness, and low power requirements of SiPMs can prove advantageous. One area in which SiPMs are being viewed increasingly favorably is in use with scintillators as part of a radiation detector. One significant advantage SiPMs typically possess over PMTs is a higher photon detection efficiency, and consequently evaluation of the photon detection efficiency as a function of wavelength for various SiPMs will be a key driver in selection of SiPMs for use as a radiation detector, not only when compared to PMTs but when selecting among different candidate SiPMs. While SiPM manufacturers provide this information on data sheets, differences in testing conditions can arise when comparing SiPMs from different manufacturers. Thus, a comparison of SiPM wavelength sensitivity as a function of overvoltage in identical testing conditions for SiPMs from different manufacturers is beneficial and carried out in this work. One disadvantage of SiPMs when compared to PMTs is significant nonlinear response for high amounts of incident light caused by the finite number of microcells in the SiPM. Experimental characterization of this nonlinearity caused by increasing amounts of incident light is also performed. For this work, SiPMs from multiple manufacturers including Hamamatsu, Ketek, and SensL have been acquired and results will be compared to a Hamamatsu photomultiplier tube assembly. To assess the wavelength responsivity and nonlinearity of SiPM response, a PLP-10 picosecond pulser from Hamamatsu will be used. The pulser has tunable power output and laser diode heads of 375 nm, 405 nm, 445 nm, 473 nm, and 510 nm to allow measurement of photon detection efficiency at different wavelengths. This work will result in relative photon detection efficiencies for multiple SiPMs from multiple manufacturers and assessment of output nonlinearity for said SiPMs.