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VIS (PR3)
takafumi.ushiba - 20:02 Friday 10 December 2021 (19174) Print this report
GreenX alignment: December 10

Abstract:
I moved PR3, ITMX, and ETMX to obtain X arm flash.
C arm flash was recovered.

Detail:
I tweeked suspensions in the same way of klog19083.
Now GreenX flash was recovered (fig1).

Alignment change was as follows:
PR3: (P,Y) = (-100, 70.5) -> (-103,70.0)
ITMX: (P,Y) = (1.0, 26.8) -> (90.7,33.0)
ETMX: (P,Y) = (0.3, -40.0) -> (3.5,-22.5)

Alignment change of ITMX is so large, especillay PIT (about 90 urad)!!
What happens?

Images attached to this report
Comments to this report:
shinji.miyoki - 20:44 Friday 10 December 2021 (19175) Print this report

A Heavy TMP/IonP set was finally connected with IXV tank on  - X side as the attached photo? -> Uchiyama-kun.

I addition to this, the leak test was done by Mirapro/Kimura-san because Kimura-san said "there was a leak" in the acceptance test meeting? If so, the TMP/IonP side might attracted the IXV tank in -X side? -> Kimura-san

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takashi.uchiyama - 23:05 Friday 10 December 2021 (19178) Print this report
New pumping unit was connected to -X direction of IXV chamber.

I think evacuation of only the pumping unit for leak test caused the displacement of the IXV chamber in -X direction.
takaaki.yokozawa - 12:37 Monday 13 December 2021 (19183) Print this report
I remembered that I touched the oplev windshield during the TCam acceptance check (klog19111)
During this work, I opened the wind shield of TM oplev, at this timing, the pitch may be drifted.
t0 of attached figure is the timing of taking picture. Sorry for inconvenient...
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takafumi.ushiba - 18:13 Monday 13 December 2021 (19192) Print this report

[Yokozawa, Tamaki, Ushiba]

After confirming the reason of good alignment values of OpLevs, we centered QPDs.
During the work, we checked the GreenX flash to avoid missing the ITMX alignment.
Now, we can see the GreenX flash when ITMX alignment is (P,Y) = (0,0) as you can see in figure 1.

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