  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 (LAPPD$^{\rm TM}$) 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$\times$2.5
cm$^2$ 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.
