1) this morning, I aligned to CFP to get back 82kW in the cavity for 33% of amplifier ratio.
thus, we can ajust the iris positions on the optical table to fix the CFP optical path before touching the CVBG.

2) we aligned the 5 iris. all of them were misaligned by 1-2mm, principaly vertically (maybe because we had to change the CFP frequency some time ago to match the new RF frequency?).

3) we opened the compressor box and found out the beam on the last mirror was really on the border => we have to move it.

=> we recorded several beam profiles at 20-70% of amplifier ratio (see images before realignement)
above 50% of amplifier ratio, the beam is deformed.

=> we realigned the 2 last mirrors of the compressor and compensate the axis displacement with the 2 inches injection mirrors at the output of the compressor to get back the telescope axis.
amplifier ratio (%)                 power after compressor (W)
0                                                 0.286
10                                               0.91
20                                               8.6
30                                              16.7
40                                              25.5
50                                              34.5
60                                              42.5
70                                              50.0
80                                              57.0
90                                              64.0
100                                            70.0

small power drop for ratio < 40% compared to previous measurements : https://elog.lal.in2p3.fr/FPC/THOMX+commissioning/133

the power is back => OK ! :-)))

we took some images with the beam profiler at high power after the realignement (see images after realignement)

tomorrow, we have to realign the amplifier beam axis to the CFP axis.