Investigating a bit the problem, making some trials with the rotator, I've discovered that the macro that keeps the IMC transmission at 17 W was decreasing the IMC output power. This misbehaving of the macro was due to the fact that it seems we reached the maximum possible power (around 22 W) at the output of the IPC system.
In order to be able to relock the ITF, I've switched off the IPC macro and put back manually the rotator in the right position (from -45 to -39).
This problem of loss of the laser power will have to be investigated at the end of WSR13.
NB: The "EIBrotator servoloop" has been switched off. This macro should stay disabled until next week investigations on the laser&Injection system are completed .
If a loss of power at the IMC output happens again and it is not possible to relock the ITF. Please try to rotate manually the IPC rotator (right click on the mouse-> Injection->RotatorEl; Then select the actuator input power rotator). Put 2 in "displacement". Try backward and look if Sc_IB_TraMC increases. If not try the same amount in forward direction. If Sc_IB_TraMC is still not increasing please contact Laser&Injection on-call person.
