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IOO (General)
keiko.kokeyama - 15:33 Friday 31 August 2018 (5970) Print this report
Beam alignment towards IMMT1
[Nakano, Kokeyama]

We sent the beam to IMMT1, and the beam spot is off for 1.5cm in yaw (to the left, looking from the HR surface) on IMMT1.

Some points:
1. the beam spot of the IMC transmission is on the center of STM1 and STM2
=> IMC transmission beam hasn't changed since phase-1
2. the beam was aligned so it transmits IFI properly by adjusting STM1 and STM2
=> IFI transmission beam hasn't changed since phase-1 (and also since iKAGRA, because IFI has never moved)
3. When the main beam transmits the IFI, IMMT1 TRANS beam was off in pitch for about 0.5 inch (lower) at the first in-air steering mirror on the breadboard. Yaw was at almost the same position, i.e., it was passing through the very narrow space between the IMMT1 oplev transmitter and the receiver QPD. Now it is again aligned to the QPDs again.

The beam on IMMT1 is not clipped. The reflection beam from IMMT1 reaches IMMT2; at the center in YAW, at very high in PIT. We did not align (or did not do anything) with IMMT1.
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