The collaboration has been measuring since ~2016 at least, so they have multiple generations of sensors installed. You capitalize and emphasize "the arxiv Paper

The collaboration has been measuring since ~2016 at least, so they have multiple generations of sensors installed. You capitalize and emphasize "the arxiv Paper" as if the group published one paper only as if they are from then on forbidden to explore other sensor constructions. The parent article describes a more recent iteration using silicon multi-pixel photon counters (MPPCs aka Si"PhotoMultipliers" SiMPs). Hamamatsu makes more than conventional PMT's: https://www.hamamatsu.com/jp/en/product/optical-sensors/mppc/mppc_mppc-array.html https://www.hamamatsu.com/jp/en/product/optical-sensors/mppc... When I said $5 to $10 range I was referring to some of these for example (did not thoroughly search for the lowest priced across distributors right now): https://www.mouser.com/c/optoelectronics/optical-detectors-and-sensors/photodiodes/?product=Photodiode%20Arrays https://www.mouser.com/c/optoelectronics/optical-detectors-a...