Bergoz Beam Loss Monitor (BLM) is a
new approach to measure and localize beam losses. It uses two PIN photodiodes mounted face to face to detect charged particles. The charged particle passes through both PIN diodes, causing a coincidence in the detection circuitry. This makes it insensitive to synchrotron radiation photons that are generally stopped by the PIN diodes.
It's very small size and low cost make it possible to monitor all locations where beam loss is predicted. Vacuum quality around the storage ring may be based on the BLM count rate.