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VIS (EY)
ryutaro.takahashi - 8:00 Wednesday 29 July 2026 (37286) Print this report
Offload of GAS filters

I offloaded the BF and F2 GAS filters with the FRs.

Comments to this report:
takaaki.yokozawa - 8:09 Wednesday 29 July 2026 (37287) Print this report
In this morning, during the initial alignment, I noticed that the ETMY guardian was isolating state.
I changed TWR_DAMPED state and it seemed no problem, but when ENGAGE_TWR_DC, GAS fluctuated a lot as shown in Fig.1. and Fig.2.

After Takahashi-san's offload work, I confirmed LOCK_ACQIOSITION state
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ryutaro.takahashi - 9:26 Friday 18 September 2026 (37503) Print this report

I offloaded the F1 GAS with the FR.

ryutaro.takahashi - 13:12 Friday 25 September 2026 (37538) Print this report

I offloaded the F2 GAS with the FR.

ryutaro.takahashi - 18:42 Monday 28 September 2026 (37563) Print this report

Though I tried to offload the F0 GAS with the FR, the FR didn't work well. So I changed the setpoint for the F0 GAS from 4527 to 4250 temporarily to avoid saturation.

ryutaro.takahashi - 17:27 Tuesday 06 October 2026 (37618) Print this report

Though I tried to offload the F0 GAS with the FR, the FR didn't work well. So I changed the setpoint for the F0 GAS from 4250 to 4230 temporarily to avoid saturation.

shinji.miyoki - 23:07 Wednesday 07 October 2026 (37626) Print this report

To adjust F0, I increased the heater power from zero to 900W. Then the temperature increased by 1 C degree. I hope it affected the F0 position to the better status.

shinji.miyoki - 8:29 Thursday 08 October 2026 (37628) Print this report

I suspected that the heat-up is wrong according to the data relation between F0 GAS and temp at EYV. I asked Takahashi-san, and we decided to cool down again. I turned off the heater around 8:30. We will check whether we can cool more in EYV.

ryutaro.takahashi - 18:55 Thursday 08 October 2026 (37633) Print this report

The setpoint of the F0 GAS has been changed from 4527 to 4230 to avoid saturation (klog 37563 and 37618). The gap in the F1 damper was increased by 0.3mm. The plot shows the TFs from IP Y to BF Y. The Q of the torsion mode at 31mHz became higher.

Images attached to this comment
shinji.miyoki - 20:58 Friday 09 October 2026 (37642) Print this report

In addition, we reduced the number of operated FFU from 2 to 1. Then the EYV temp became ~ 22.4C. Finally, the EY F0 seemed to back around 15000.

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ryutaro.takahashi - 15:53 Friday 30 October 2026 (37776) Print this report

After the repair work on the clean booth, I set the Type-A suspension to ISOLATED mode. Since the temperature in EYV is still high, the F0 GAS has saturated. I changed the setpoint of the F0 from 4210 to 4200 temporarily.

ryutaro.takahashi - 9:26 Monday 09 November 2026 (37820) Print this report

I changed the setpoint of the F0 GAS from 4200 to 4300.

ryutaro.takahashi - 9:12 Tuesday 10 November 2026 (37827) Print this report

I changed the setpoint of the F0 GAS from 4300 to 4250.

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