the laser coupled into the amplifier is still measured at ~3mW at the input, on the Alphanov software, once the Amp stage are started at 0% of power ratio.
this afternoon, Kevin restarted the 3rd safety system of ThomX to grant the opening of the beam shutter => now the shutter can be opened.
after adjusting the phase for the PDH system, I was able to find back the laser/CFP lock.
after some minimal alignement, one gets back 50kW for 30.5% of laser amplifier ratio, as before the Christmas shutdown.
I didn't try to lock the FP cavity on the 500MHz RF reference clock as I'm not sure if it has been set to 500.25MHz (as before shutdown) or at 500.1MHz (the future RF frequency) which is very far and will require to move the FP cavity on a long rage.
=> I will ask to Vincent Chaumat to confirm the present RF frequency.
| Ronic Chiche wrote: |
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this morning, I plugged back the 4 power cables which supply all the equipments.
all the equipments have restarted without problem, but the shutter of the laser amplifier needs a ThomX safety system grant to let the beam propagate to the cavity...
and then continue the commissioning of the restart after Christmas shutdown.
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