14-17 September 2021
America/Los_Angeles timezone

Assembly and characterization of a large area VUV sensitive SiPM array for the nEXO TPC teststand at Stanford

14 Sep 2021, 14:25
Light/charge readout (PMT, SiPM, WLS, electronics etc.) Light/Charge Readout (1C)


Jacopo Dalmasson (Stanford University)


One of the important variables to optimize for a successful detection of the neutrinoless double-beta decay is the energy resolution at its Q-value. nEXO is a proposed tonne-scale experiment aiming to search such decay for the isotope Xe-136. It exploits the anticorrelation between ionization and scintillation of xenon to improve the ultimate energy resolution. A major factor affecting the resolution is the fluctuation of charge and light ultimately collected.
In a time projection chamber (TPC) detector, the electron collection efficiency is usually close to one. Conversely, the collection of photons can vary dramatically depending, along with other factors, on the overall light-sensitive area of the detector.
The Stanford liquid xenon TPC is a teststand planning to host the first VUV large area (~200cm2) SiPM array. The setup firstly aims to study the feasibility of such system with dedicated readout electronics and ultimately to investigate how a better light collection affects the detector performances, important prototyping step for nEXO.
In this talk, I will report on the status of the assembly of this photodetector array, along with characterization measurements and comparison with simulation.

Primary author

Jacopo Dalmasson (Stanford University)

Presentation Materials