Yesterday 30 Nov we performed few wavefront measurements with injection HWS in order to center the HWS beam on WI test mass, using WI RH thermal lens as a reference.
We completed the cabling of the picomotors of M1_Har and M2_Har on EIB.
WI RH was switched on at 12.17 local time with 40 volts per ring, then we acquired 75 wavefronts for about 50 min, while the W cavity lock was kept active as long as possible. Nonetheless, the lock was lost before the end of the measurement due to the effect of RH thermal lens.
Then we switched off the RH at 13.57 local time, and we tried to acquire wavefronts during the ccooling phase; however, the lock turned out to be difficult and we discarded the results.
Then WI RH was switched on again at 16.07 local time running a local control on WI mirror tilt, acquiring again 75 wavefronts; the RH was then switched off at 17.34 local time, acquiring 75 wavefronts in the following temperature drop.