Again a new test with the beam on. At the begining the beam was off and it can be noticed.

There is a lead wall after F11 plastic and in the polyethilene block there are two lead bricks to block the beam to AIDA.

201905301448_background_AIDA_in.root

201905301457_background_AIDA_in.root (beam was stopped for a short period)

Rates with the beam: 2.2 kHz (Dynodes), 2.3 (anodes)

I will not erase it and continue to collect root files (no lmd for the moment), they are still optimizing things. Rate at F11 should be similar to

the rate at F7 according to Pieter. Rate at F7 plastik  is 5 kHz. The plastik spectra (F11, our plastik) shows some spikes.