I measured the trasfer function from TML to DARM by using BS.
Figure 1 shows the result.
The data was stored at /users/Commissioning/data/NoiseBudget/TFs/2022/1007/TF_BS_TMLtoDARM_1007.xml
The slope is almost f^-2, which is consistent with theoretical one.
Noise projection to DARM from MICH feedback will be calculated soon.
Date: 2022/10/7
With Dan Chen
We calibrated WSK (= IS between UToyama and KAGRA) with GSK calibrated by LIGO.
The measured ratio of WSK over GSK: 0.140267 +- 0.000101 [V/V]
Detailed report: link
Overview
k1script is running on Debian8 OS.
We are planning to update it to Debian 10.
However, there are some resident softwares, so it is not possible to migrate.
Support
Migrated CRY and PEM cryocon daq and vacuum daq crontab.
Procedure
1. Updated Python from Python2 to Python3. Some errors were addressed.
The old source code is kept as deb8.
2.Removed from crontab of k1script and added to crontab of k1script1.
$ crontab -e
3.vacuum daq was newly created because key authentication was using it.
Next schedule
We will move the ones running from supervisorctl one by one.
We plan to ask you to take action as necessary.
Since PLL cannot be locked stably, I changed the temp bias offset for PLLX (K1:ALS-X_LASER_TEMP_BIAS_OFFSET) from -0.2 to -0.55.
Today I investigate the geophone residual coupling between DOF and I estimated the inter-calibration factors between the geophones and LVDTs along L, T, and Y directions.
Pic.1 shows the broadband residual coupling, as a function of the frequency, before and after changing the geophone align matrix.
Looking at this plot, it is possible to note that the sensing couplings, especially the terms L2T, L2Y, T2L, and Y2T, are reduced.
The matrix seems to work fine.
Concerning the inter-calibration, a way to do that is to rescale the gain of the diagonalized geophone to match the amplitude of the TFs measured by the diagonalized LVDT_(L, T, Y). Keeping this idea in mind, I extrapolated the calibration factor of each geophone, at 0.2 Hz, calculating the ratio LVDT_(L, T, Y)/GEO_(L, T, Y).
Here are the values:
GEO_L= 1.0476
GEO_T= 1.1221
GEO_Y=1.2971
In pic. 2, Pic.3, and Pic.4, the comparison of the TFs before and after the calibration is shown. Looking at these plots, it is possible to see that the TFs between and GEOs are matching.
Note.
I haven't yet implemented these values in the MEDM, but I will as soon as the suspension is available.
coherence with infrasound microphones
Ikeda, Michael
I checked to confirm the appropriate behaviour of the OMC_DCPD filter banks. When TIA is set to 100, FM8 should be on and FM9 should be off, and vice versa for TIA set to 400 (see figure 2). However, there was no change in the filter banks when I changed the TIA setting.
I tried replacing the switch in figure 3 with an AND gate (TIA_ZSW_OUT AND CONNECTED) but it didn't make a difference. Then I just removed the AND gate, sent CONNECTED to a terminator and put TIA_ZSW_OUT into B7 and B8, with the NOT gate still before B7. But that didn't make any difference either.
When I change the TIA setting in the OMC dock I can clearly see a change in the output signal of the DCPD, and using caget I can confirm that TIA_ZSW_OUT is going between "ON" and "OFF" (or 1 and 0 if using ezca read). So I guess the problem is somewhere between the model and the interface.
Performed the following tasks related to OMC
Request from michael-san
Restarting the k1omc model was done with Mozumi.
However, it did not work as expected.
I will help again next time.
Request from Tanaka-san
FE of k1ascbeacon and k1sendbeacon remained red.
=> I rebooted once and FE was restored.
And I added a Picomotor channel used by WFS for beacon OMCASC.
I will connect Picomotor next time.
I tried to switch the current KAGRA IR laser to the new high power laser (HPL). The new laser was injected in front of AOM.
Last week I moved the AOM 5cm to PMC direction and I moved 2.5cm more today to make a enough space for X-stage with a steering mirror.
The new bean has been aligned to PMC and mode matching has been done with proper lenses and their positions.
Still alignment and mode matching are not perfect at all, but it was succeeded in locking PMC with the new HPL!
I needed to modulate to obtain error signal of PMC, I used the cable of current 15MHz signal and connected to a new 15MHz modulator in the HPL box.
After this switching test, I recovered the current KAGRA laser and PMC lock. Every thing should be back except for the position of AOM.
I will try a little more tuning for PMC and lock for IMC with HPL next week.
DGS Regular maintenance day(10/07)
All TestPoints were cleared before maintenance.
Stepper motor
[Checked]
Check if the power supply can be controlled by BIO
Check if the script can be started
Checked that the limit switches installed are green.
[Check result]
No problem
BS is suspended for maintenance at other locations.
Release Sensor
[Checked the Release Sensor.]
Checked that Release Sensor is 0, 1: Seated.
[Check result]
ETMX, ETMY, ITMX, ITMY : No problem
Picomotor
[Confirmation]
PingTest is performed.
[Result]
Only known
NG:
BS(BF),SR2(IM)
=> Hung, rebooted and recovered.
MCI,STM1,
AS_WFS,POP_POM,POS_POM,POM1
MCF(MCO,MCI)
=> Confirmation only, no recovery operation was performed.
OK:
ETMX,ETMY,ITMX,ITMY
BS(IM,BF),SRM(IM,BF),SR2(IM,BF),SR3(IM,BF,STM)
PRM(IM,BF),PR2(IM,BF),PR3(IM,BF)
MCE,IMMT1,IMMT2,OMMT1,OMMT2,OSTM
REFL_WFS,POP,POP2,POS,POS2
PCAL(EX1,EX2,EY1,EY2):Not checked because it is ON only when used
Temperature controller
[Checked]
Is the temperature acquisition working properly?
[Check result]
Is the temperature acquisition working properly?
=> No problem
Precision air Processer
[Check Contents]
Is the temperature acquisition working properly?
[Result]
No problem
FunctionGenerator
(Confirmation)
Is there a ping response?
Are all EPICS channels alive?
[sitemap]-[Commissioning]-[ALS FG]-[Xarm],[Yarm].
[Check result]
X and Y PLLs are working properly.
HWP control PC
(Confirmation)
Check if it is possible to login to the control PC.
(Result)
Both k1hwp0 and 1 are OK.
I checked the OSTM suspension. I found the IM is touching the magnets in X+Y-.
I updated some of the monitoring channels in the OMC dock ndscope popups. Specifically I changed the OMC LSC and ASC ndscope monitors to use _DQ channels. In the OMC Lock module, I also changed the TMS IR monitors from AOS-TMSX(Y)_IR_PDA1_OUTPUT to TMS-X(Y)_IR_PDA1_OUT_DQ.
We estimated the transmissivity of the OMC.
Since we can not scan the cavity length, we try to lock every transmitted mode and check its power. This measurement is done with 100 Ohm transimpedance.
Incident power ~ 81 [mW]
Transmission ~ 1 + 2 + 5 (TEM02 of carrier) + 0.4 + 0.2 (TEM00 of RF sideband) + 15 (TEM10) + 50 (TEM00 of carrier) = 73.6 [mW]
total power ratio ~ 73.6/81 = 90.8 %
HOMs with small power were hard to identify the mode.
The remaining 10 % of light could be lost by mirror contamination. For a more precise estimation, we need to scan the cavity in a more stable situation, but it couldn't be realized without drawing vacuum.
I prepared the script (jupyter notebook) to show the improvement of KAGRA's sensitivity during O4 commissioning.
The plots (by using sensitivity on Sep. 22) and jupyter notebook were uploaded on JGW doc. Please use it after editing as you want. Sorry for late post.
[Terri Chiaki]
We updated MEDM screen(ASC_OVEWVIEW.adl) to support POP_PZT for DC centering.
detail :
Strictly speaking, we can lock FPMI with 3F but cannot hadover 3F signals to 1F signal due to the beam lost at POP PDA1, which is used for MICH lock.
Since CARM and DARM signals can be obtained at REFL and AS, in-vac alignment should be fine, so the suspicious point is POP table.
After alignment work, we tried to lock FPMI, but we couldn't lock because there was no light in the POP PDA1.
This should be checked tomorrow.
► Trasmitted light powers were as below.
Strictly speaking, we can lock FPMI with 3F but cannot hadover 3F signals to 1F signal due to the beam lost at POP PDA1, which is used for MICH lock.
Since CARM and DARM signals can be obtained at REFL and AS, in-vac alignment should be fine, so the suspicious point is POP table.
