2026/04/03:

After the DAQ recovery ( https://logbook.virgo-gw.eu/virgo/?r=68964 ), all quadrants were recovered (shutters opened and Vbias enabled), and we enabled back the photodiodes used during the lock acquisition.

2026/04/07:

We recovered the angular control and the position control of all the minitower detection benches (SDB2, SPRB, SIB2, SNEB, SWEB) as well as SDB1 (after the suspension team recovered its suspension).

2026/05/08:

DET_MAIN node recovered in SHUTTER CLOSED state after adjusting the B1s and B1_PD3 electronic offsets, and with a beam visible on the B1p camera.

Adjusted demodulation phases for the OMC lock error point (B1_PD3_f1 and B1_f1) with NI single bounce beam. For B1_PD3 the demodulation phase was changed from 1.5 to 3.4 rad (Fig.1). For B1 the demodulation phase was changed from -0.7 to +1.0 rad (Fig.2).

We also adjusted the offsets of the B1 PD1 and PD2 photodiodes.