With Hirata-san.

Summary: the BS optic is 2.8 mm below the average height of the flanges when F0 and BF are close to zero and F1 is alledgely close to zero.

See pictures in the album BS Remedying work after O3.

• Temperature: T_ondotori = 23.6  °C, T_PT100 = 23.6  °C.
• We set the F0 anbd BF GAS fiters at zero with coil magnet actuation:
  • F0: 14,000 cnt,
  • BF: 4000 cnt,
• F1 LVDT is not working well (entry 18191), so we checked the amount of actuation we used the last time we measured the height, when the LVDT was working, and used the same value (entry 17338 from the 30th of June, 2021). This is fine because we have the same temperature today (23.6 °C) and the fishing rod has not been used:
  • F1 actuation: -10,000 cnt (per Data Viewer).
  • F1 LVDT: 787 um (nominal is zero but we have a faulty LVDT primary coil).
• As a reference we used Tomaru-san's marking of the average of the heights of the four flanges of the chamber.
• The measured height to be approximately 2.8 mm below the reference.

Task:

Morning:

Who:
Rishabh, Yasui-san

• Rion accelerometer was mounted on the optical table to measure the vibration. 2Tokkyokiki accelerometers were mounted on chamber. (see attached photos)
• Vibration was measured with all cryocoolers on and off in optical and vertical axis.

Afternoon:

Who:
Rishabh

I did measurements using cry and rion accelerometer in the machine room.

With Hirata-san, Terrence and Yano-san.

Summary: we raised the pre-isolator in order to have the mirror (RM) at the expected beam height when the GAS filters are at their nominal positions (zero). 

See pictures in SRM Remedying Work album.

• Temperature T_PT100 = 23.2 °C , T_ondotori = 23.0 °C (O3GK T_ondotori = 22.9 °).
• We set the GAS filters to approximately zero with coil magnet actuation:
  • F0: 1,500 cnt,
  • F1: -8,400 cnt,
  • BF: -2,000 cnt.
• According to entry  18649, the mirror was 2.8 mm below the expected beam height, therefore, we raised the jacks (M42 X 2mm thread) by rotating them counterclockwise 1.4 turns approximately.
• We measured the mirror to be at the correct height (at zero with respect to the reference, see this notes).
• Then we adjusted the tilt of the IP:
  • L: -201 um (setpoint -550 um),
  • T: -100 um (setpoint -50 um) .

I saw the user code error of ETMX guardian today.
I didn't fix the bug and manually went to SAFE state for my work.

This enhancement is correlated with the temp change in the corner station machine room where Rishabh kun set several instruments that generate heat!

As you know, this room and the front area of IXYV are connected with each other thtough the spiral staircase hole, and a strong fan is set to flow the air from the top of this spiral staircase to the front room in the first floor.

So, I guess his activity is the source. But anyway, I hope it will be harmless, and it is not related to some troubles that generate heat.

Hayakawa-kun found a different performance in BS-C cooler from others. It seems to repeat "defrosting" (~18 C air generation) and cooling (~9C air generation) because the BS-C cooler got a lot of frosting in its cooling system. Others have no such frosting even if the operation condition, such as the amount of water flow, seems to be same with each other.

We reported this to the maker, and now wait his opinions.

[Takahashi, Sato]

We checked the BF actuator.

• DC magunitude of the transfer function from the actuator to the LVDT was <-70dB in the fixed BF and -60dB in the free BF, respectively. 
• The secondary coil may touch the primary coil when the BF was fixed with the weight on the cup. The secondary coil was centered for the primary coil as much as possible.
• The wrong magnets were assembled in the yoke. Direction of the polarization (N/S) was horizontal. We replaced them to the magnets with the vertical polarization.
• DC magunitude of the transfer function was improved to -40dB in both fixed and free BF.

I made template files from COILOUTF excitatyion to each sensors.
To check the template and automeasurement scripts, I am running the scripts tonight.

[Ikeda, Nakagaki-san, Yasui-san, Ushiba-san(Remote)]

Installed ribbon heaters on PRM and PR2.
PRM is all installed.
PR2 could not be installed until the end because of the missing three-prong outlet, lack of parts, and lack of time.
The thermometer and two seals installed in the PR2 chamber were moved down a bit after consulting with Ushiba-san, Yokozawa-san and Kimura-san respectively.

Performed temperature rise test on PRM.
We set the SLOPE of the temperature controller to 4 and the target temperature to 40°C. We heated the unit for about an hour and a half, and the temperature rose to 34.1°C.
PR2 will be tested again later.

We checked the value of TM_WIT in PR3 before and after the work and found that the value fluctuated as shown in K-Log #18691, but it was due to LED lighting and was not affected by this work.

[Remaining work on temperature control equipment]

IY, EY: Installed ribbon heaters, installed thermocouples, wrapped aluminum tape, installed power regulator, temperature rise test
IX, EX, PRM: Available
BS, SR2, SR3, SRM: Temperature rise test completed, power regulator installed after delivery (November)
PR2: Need to re-purchase three-prong outlet, otherwise complete, temperature rise test not yet conducted
PR3: Ribbon heater purchased, to be installed after confirming need for installation.

[Main work]
Installation of power regulator: waiting for power regulator to be obtained
Temperature rise test: Determine the SLOP value of the power regulator and set it to rise to about 30°C.
 

[Ushiba-san, Tamaki]

Today, I made the template diaggui file for health check of ITMY IM in the same way as MN (klog #18642).
The figres of the templates I made are attached to this report.

Tomaru-san, Yasui

We pasted the Design Height Stickers of PR3, PRM, and IMM.

[Ikeda, Yasui, Ushiba]

Abstract:
Today, I found there are strange jumps of signals of PRM, PR2, and PR3 OpLevs, so we checked the reason.
Finaly, we found that the LED lights at the cleanbooth affects the OpLev signals a lot.
So, we need to take care the LED light condition before and after the mine work.

Detail:
Tere are several strange jumps of the signals of PRs' OpLevs today (fig1).
First, we suspected the work for VIS heaters but we found no change by turning on and off the installed heaters.
Then, we  suspected the effect from the LED light and found that the LED light affets a lot for OpLevs.
So, we turne on and off one by one, and now all PRs' OpLev signals seems to be back in the morning condition.

We need to take care the LED light condition not to lose the OpLev references.

Date: 2021/10/26

Members: Dan Chen, Darkhan Tuyenbayev

We fixed every connectors with screws on YPcal Tx/Rx module except the connector which includes interlock cables and a thermometer in Tx module.

We did not connect this connector because there is an unstable soldering (?) on it and we will repair it later.

So the temperature output in Tx module of YPcal always shows ~0 degrees.

(The laser and AOM driver are OFF, and the shutters are close now, so the temperature inside the Tx module will never be higher.)