I revised the diaggui templates for the health check of the IP. The resonant frequencies of the IP were changed from 63 to 51mHz for L and from 70 to 59mHz for T.

I checked the IP transfer functions after removing the 1kg ballast ring.  The resonant frequencies of the IP were changed from 51 to 55mHz for L and from 59 to 63mHz for T. They are still lower than the reference (63mHz for L, 70mHz for T).

I checked the IP transfer functions after removing the second 1kg ballast ring.  The resonant frequencies of the IP were changed from 55 to 59mHz for L and from 63 to 66mHz for T. They are still lower than the reference (63mHz for L, 70mHz for T).

We checked the IP transfer functions after removing the third 1kg ballast ring.  The resonant frequencies of the IP were changed from 59 to 66mHz for L and from 66 to 70mHz for T. They were close to the reference (63mHz for L, 70mHz for T).

I checked the transfer functions of F1, BF, IM, and TM. The states during the measurement were READY for F1 and BF, TWR_FLOAT for IM and TM. The diaggui for F0 did not work. 

I added the F0 transfer function measured with a modified template.

I checked the IP transfer functions after closing the chamber.  The resonant frequencies of the IP were increased from 63 to 66 mHz for L, from 70 to 74 mHz for T, and from 0.32 to 0.33 Hz for Y, respectively. Diagonization should be retuned.

I checked the GAS transfer functions after closing the chamber. They were consistent with the references.

I checked the IM transfer functions after closing the chamber. The DC gain of the H1 and L transfer functions was increased by 3dB due to the replacement of the satellite box.

I checked the TM transfer functions after closing the chamber. They were consistent with the references.

I checked the TM transfer functions in vacuum. They were consistent with the references.

I checked the GAS transfer functions in vacuum. They were consistent with the references.

I checked the IM transfer functions in vacuum. The DC gain of all transfer functions was decreased by 3~5dB. The position change of the OSEMs was 200um maximum (H3 and V1). The measurement for the V1 failed. 

I checked the IM transfer functions under the TMP operation. The situation was not changed (The DC gain of transfer functions is smaller than the reference, except for L).

I checked the IM transfer functions after the TMP stopped. The situation was not changed (The DC gain of transfer functions is smaller than the reference, except for L).

I checked the IM transfer functions after the pressure reached 8E4 Pa. The behavior returned to the situation before starting the evacuation.

I checked the IM transfer functions after closing the chamber. The behavior did not change after opening the chamber to remove the geophone pods.

I checked the IM transfer functions after the evacuation. The behavior reappeared in a vacuum. The DC gain of transfer functions is smaller than the reference, except for L.

I checked the IM transfer functions in a vacuum, changing the OSEM positions. The position in um was changed by the DC actuation of +10000 count to some COILOUTFs, as shown in the table. In any case, the behavior was almost the same (the DC gain of transfer functions is smaller than the reference, except for L).

I checked the signals of the IM OSEMs during the evacuation. The signals in count were increasing slightly during the pump-down with the DRY pump, due to the buoyancy. Just after switching the pump from the DRY to the TMP, the signals decreased rapidly in 10 min. The pressure change was from 10 Pa to 0.02 Pa. In this pressure region, the thermal conductivity of the gas changes a lot. I think this signal drop is due to the temperature change of the LED in the OSEMs.

I checked the signals of the IM OSEMs during the pump down. Just after starting the pressurization from 2.0Pa, the signals in count rapidly increased in 1 min.

I checked the IM transfer functions after closing the top flange. They are consistent with the references except for L and H1 (the DC gain is 3dB larger than the reference due to the replacement of the satellite box).

I checked the IP transfer functions after closing the top flange. IDAMP signals are not treated well (just summation of ACC+FLDACC+LVDT), so please check the LVDT responses in BLEND signals. The resonant frequencies of the IP were 63mHz for L, 74mHz for T, and 0.32Hz for Y, respectively.

I checked the GAS transfer functions after closing the top flange. They were consistent with the references.

I checked the TM transfer functions after closing the top flange. The Length Oplev was not aligned well, so the DC gain of the transfer function for L was smaller than the reference.

I checked the IM transfer functions again at 10Pa. The DC gain was smaller than the reference a little (1~2dB).

I checked the IP transfer functions in a vacuum. IDAMP signals are not treated well, so please see the LVDT responses in BLEND signals. The resonant frequencies of the IP were 63mHz for L, 74mHz for T, and 0.32Hz for Y, respectively.

I checked the GAS transfer functions in a vacuum. They were consistent with the references.

I checked the IM transfer functions in a vacuum. They were the same as the recent situation in the vacuum (the DC gain is smaller than the reference, except for L and H1).

I checked the TM transfer functions in a vacuum. The IP setpoints were reset to the original (-164 to -550 for L and -24 to -50 for T), so the Length Oplev was also aligned. The transfer functions were consistent with the references.

I checked the behavior of the OSEM gains when the Type-B/Bp chambers were evacuated in June, 2024. The gains of some OSEMs in any IMs (PRM, PR2, PR3, BS, SRM, SR2, SR3) were reduced in vacuum.