demo: aim drich torch to sensors via one mirror bounce - #434
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Launch the disc from open gas behind the sensor shell along the mirror-center -> sensor-patch axis: the photons take one specular bounce off the mirror sphere and refocus onto the same SiPM patch the stock aim hits directly. Same geometry, wavelength and seed; only pos/mom change. Integration.simg4ox.drich then fails: G4 0 hits vs GPU ~5600 (stock aim: G4 8355 vs GPU 8324, PASS).
This was referenced Aug 4, 2026
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This PR proves that the current dRICH test measures the wrong metric and the current dRICH Simphony implementation does not work. The current test shoots photons to the sensors bypassing the dRICH mirrors that the Cherenkov photons need to hit and be reflected onto the sensors. The attached plot show the dRICH geometry.
We launch the photons from open gas behind the sensor shell along the mirror-center -> sensor-patch axis: the photons take one specular bounce off the mirror sphere and refocus onto the same SiPM patch the test in main hits directly. Same geometry, wavelength and seed; only pos/mom change.
Integration.simg4ox.drich then fails: G4 0 hits vs GPU ~5600