Reports until 21:46, Tuesday 04 June 2024
H1 CAL
francisco.llamas@LIGO.ORG - posted 21:46, Tuesday 04 June 2024 (78247)
Pcal XY comparison investigation - fourth movement, inner beam centered

FranciscoL, [Remote: RickS]

After one week of moving the inner beam down by 5 mm on the Rx sensor (alog 78107), on June 4, we moved the beam back to center of the target.

The ETM was missaligned during the procedure. It will be interesting to see any effects from this state of the interferometer on making changes to the position of the inner beam.

Attachment 'AlignedTarget' shows the alignment with the beam height gauge. Attachment 'BothBeamsBefore' shows the beams before making any changes. The pdf 'EndStationLog.pdf' lists the voltage values after each significant step of procedure T2400163. The steps represent writing down a voltage value after a particular change to the beam position. Some steps were recorded multiple times after minor changes.

The 'Initial' measurement is *equal* to the last voltage measurement from the previous movement, done on May 21 (alog 78107). The initial and final voltage measuremed during todays procedure decreased by 2 mV (6 HOPs). The digital thermometer had a temperature of 21.1 at the beginning of the procedure and increased by 0.6 C. Will record temperature more carefully on following procedures.

With the movement made today, we expect that the X/Y comparison to return to 1.

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