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AdV-DET (Commissioning)
masserot, gouaty - 19:18 Friday 19 March 2021 (51154) Print this report
Comment to Change of VGA gain on B2 photodiodes (51147)
At the beginning of the afternoon shift, we reduced the VGA gains of the B2 quadrants in order to prevent them from saturating (Fig.1):
- Gain of B2_QD1: reduced from 9.86 V/V to 0.7 V/V (corresponds to a reduction of 22.7 dB).
- Gain of B2_QD2: reduced from +20dB to +3dB (reduction of 17dB).

We also further reduced the VGA gains of the B2 photodiodes (PD1 and PD3) as we noticed that they were at the limit of the saturation with the CITF aligned:
- B2 PD1 gain reduced from +4dB to +1dB
- B2 PD3 gain reduced from -6dB to -9dB.

The B2 PD3 gain is now at its minimum.
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