I accepted the following differences of SDFs (see related klog34517, klog34518, and klog34519). SDF #25-27 were reverted because of misoperation.
I accepted the following differences of SDFs (see related klog34517, klog34518, and klog34519). SDF #25-27 were reverted because of misoperation.
[Takahashi, Ikeda]
I offloaded the F1 GAS with the FR. The stepper motor initially did not work due to a network switch problem, which was recovered at the site by Ikeda-san.
I offloaded the SF GAS with the FR, which reached the maximum limit (1360000 steps).
I offloaded the F0 GAS with the FR.
I took the TCam photos for four mirrors at 9:30 ~ 9:37 this morning. The previous work is klog34453.
A CAL Tcam session was performed to obtain beam position information necessary for Pcal. The parameters have already been updated, and SDF is expected to be accepted.
Operator: Dan Chen, Shingo Hido
Update Time: 2025/07/11 09:16:29
EPICS Key | Before [mm] | After [mm] | Δ (After - Before) [mm] |
---|---|---|---|
K1:CAL-PCAL_EX_TCAM_PATH1_X | 3.46849 mm | 3.20691 mm | -0.26158 mm |
K1:CAL-PCAL_EX_TCAM_PATH1_Y | 62.58533 mm | 62.78539 mm | +0.20006 mm |
K1:CAL-PCAL_EX_TCAM_PATH2_X | 0.06867 mm | -0.21958 mm | -0.28825 mm |
K1:CAL-PCAL_EX_TCAM_PATH2_Y | -63.66836 mm | -63.36743 mm | +0.30093 mm |
Update Time: 2025/07/11 09:17:49
EPICS Key | Before [mm] | After [mm] | Δ (After - Before) [mm] |
---|---|---|---|
K1:CAL-PCAL_EX_TCAM_MAIN_X | 3.73403 mm | 3.62390 mm | -0.11014 mm |
K1:CAL-PCAL_EX_TCAM_MAIN_Y | 12.20820 mm | 11.89945 mm | -0.30875 mm |
Update Time: 2025/07/11 09:18:10
EPICS Key | Before [mm] | After [mm] | Δ (After - Before) [mm] |
---|---|---|---|
K1:CAL-PCAL_EY_TCAM_PATH1_X | 0.92272 mm | 1.27965 mm | +0.35693 mm |
K1:CAL-PCAL_EY_TCAM_PATH1_Y | 63.96127 mm | 63.48267 mm | -0.47860 mm |
K1:CAL-PCAL_EY_TCAM_PATH2_X | -0.71031 mm | -0.34771 mm | +0.36260 mm |
K1:CAL-PCAL_EY_TCAM_PATH2_Y | -70.49072 mm | -71.06132 mm | -0.57060 mm |
Update Time: 2025/07/11 09:18:46
EPICS Key | Before [mm] | After [mm] | Δ (After - Before) [mm] |
---|---|---|---|
K1:CAL-PCAL_EY_TCAM_MAIN_X | 6.31424 mm | 8.78471 mm | +2.47048 mm |
K1:CAL-PCAL_EY_TCAM_MAIN_Y | -3.21271 mm | -3.91830 mm | -0.70559 mm |
After this long lock, the BNS range seems to be sometimes degraded during locking. It is better to check the IFO conditions, especially those related to ASC and/or signal saturation. Some excess noise was visible around 60 Hz to 100 Hz.
Because of a small number of earthquakes, over 18 hours of continuous locking was realized.
However, the lock loss seemed not to be related to seismic noise shock.
After this long lock, the BNS range seems to be sometimes degraded during locking. It is better to check the IFO conditions, especially those related to ASC and/or signal saturation. Some excess noise was visible around 60 Hz to 100 Hz.
I measured the coherence between DARM and IMC ASC signals with 128 average during the stable run today (fig1).
Some large coherence can be seen in IMC WFS signals and DARM.
To evaluate the noise comes from beam jitter, noise projection with IMC WFS might be helpful.
As reported in klog34442, there is a coincidence between glitches in OMC DC PD and sensitivity degradation.
So, I tried to systematically understand the kick of the suspension and sensitivity degradation.
As shown in Fig. 1, when glitches are very large, the OMC DC PD signals can become saturated.
In this case, the calibrated DARM signal is no longer reliable, so it should be excluded from the data analysis.
In other cases, the amplitude of each glitch is different, so I categorized them into four groups based on the maximum signal in each glitch: more than 25,000 counts (#1), between 20,000 and 25,000 counts (#2), between 15,000 and 20,000 counts (#3), and less than 15,000 counts (#4).
Figures 2-5 show the Q-transform around the glitch categorized as #1, #2, #3, and #4, respectively.
Even in category #4, some excess can be seen around 60–90 Hz.
So, it would be nice to evaluate the non-lnear effect in DARM sensitivity.
Figure 6 shows the comparison of the spectra when glitches happened (as a reference, spectrum without glitches are also shown with black lines).
Finally, tunnel blasting ended. In addition, the construction on the river by other contractors appears to have stopped for a while, as there were no heavy industry vehicles or workers.
Thank you for measuring the surface of sapphire parts.
Is it possible to mask the edge of 1.5mm from the measurement results of HCB surface of sapphire ears?
Our specification of the flatness for HCB surface is 77*27 area of 80*30 surface, so it would be helpful to compare the result with the data from the company.
The monitor page (https://gwdet.icrr.u-tokyo.ac.jp/~controls/slowmonitor/GAS/) maintained by Washimi-san might be helpful to find the saturation quickly. How about asking the daily (or weekly) check for the shift operator?