Author:
Xie J.,Peng C.,Joosten S.,Meziani Z.-E.,Camsonne A.,Jones M.,Malace S.,Kaczanowicz E.,Rehfuss M.,Sparveris N.,Paolone M.,Foley M.,Minot M.,Popecki M.,Zhao Z.W.
Abstract
Abstract
The SoLID spectrometer's gas Cherenkov counters require
photosensors that operate in a high luminosity and high background
environment. The reference design features arrays of 9 or 16 tiled
multi-anode photomultipliers (MaPMTs), distributed across 32
sectors, to serve the light-gas and heavy-gas Cherenkov counters,
respectively. To assess the viability of a pixelated INCOM Large
Area Picosecond Photodetector (LAPPDTM) as an alternative
photosensor to replace MaPMT arrays in either detector, we evaluated
its performance under realistic SoLID running conditions in Hall C
at the Thomas Jefferson National Accelerator Facility (Jefferson
Lab). The results of this test confirmed that the coarse-pixelated
(2.5 × 2.5 cm2 pixel size) LAPPD is capable of handling
the total projected signal and background rates of the three pillar
SoLID experiments. The tested photosensor detected Cherenkov signals
with the capability of separating single-electron events from pair
production events while rejecting background. Although the design
was not aimed at ring-imaging Cherenkov detectors, Cherenkov disk
images were captured in two different gas radiators. Through a
direct comparison with a GEANT4 simulation, we confirmed the
experimental performance of the LAPPD.