The main goal of today is to extract the pick-off beams
Today's menu :
+ If necessary steer ETMs and ITMs to make the X and Y green beam flashing.
+ Open the IOO and OMC chamber and lock MC.
=> cover the place of the access connector by a large piece of aluminum foil. It will give a robust lock of MC.
+ Check the beam pointing down to Y arm by looking at the ETMY face camera.
=> If it's necessary align PZT1 and PZT2 from EPICS to make the IR beam flashing in the X arm.
+ Align BS and let the beam hit the center of ETMX to make the X arm flashing.
=> These alignment procedure will automatically gives us the MICH fringes on the AS CCD camera.
+ Rotate the SRM tower to get the SRMI fringes on the AS CCD camera.
=> This is because the required amount of the YAW correction on SRM is currently beyond the range of the DC bias.
+ Align PRM to get the PRMI fringes on AS CCD camera. Also make sure the beam comes back to the REFL CCD camera.
+ Lock the PRC to make POP/POX/POY bright enough.
=> Probably the REFL11 RFPD needs more power. To increase the power, just rotate the HWP, which is sitting before the RFPDs on the AS table.
=> If the signal on AS55 is too small, we can use REFL11_Q or REFL55 for the MICH lock.
+ OR inject and align the ABSL laser to make those pick-off beams bright enough.
=> This case we don't have to make the DRMI exactly on the resonance, what we need is just the DRMI flashing.
+ Align necessary optics for those pick-off beams.
=> In our definition (aLIGO definition) POP is the beam propagating from BS to PRM. Don't be confused by another one, which propagates from PRM to BS.
+ Steer two mirrors on the ETMY table for aligning IPANG. Also, steer some mirrors on the BS table for IPPOS.
=> IPANG has already reached the ETMY table, so ideally we don't have to steer a mirror on the BS table.
=> IPPOS/ANG are very visible with a sensor card.
+ Align some oplevs.
=> This work is relatively independent from the other tasks. Steve can take care of it.
+ Adjust the OSEM to their mid-range.
=> This work can be done anytime, but everytime we have to recover the alignment of the interferometer.