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hirose.chiaki - 19:51 Monday 10 June 2024 (29823) Print this report
Placed the optics for WFSf3 on MIFREFL table

[Yokozawa, Hirose]

We placed the optics for WFSf3 on MIFREFL table.

detail

  • First, with the PRM in the Aligned state, the optics were placed as per JGW-T1809238-v12. (PDFfile)
  • We confirmed that the laser beam came the QPDs on the MEDM screen.

  • We placed the BS after the shutter and tried to turn the HWP remotely, but we couldn't. Specifically, we turned it at ‘K1:SYS-HWP_IFO_REFL_WFS_STEP_TOTAL_DEG’. The number on the MEDM screen"K1SYS-HWP_CALIB.abl" changed, but the IFO REFL WFS HWP on REFL table did not turn. I couldn't resolve it within today's work, HWP remains as is. The power before and after BS is as follows. (PDFfile)

  • In MEDM screen, the DC signal part of the QPD comes from the ADC as a negative signal, so a gain of -1 had to be inserted to invert the sign. We have the following DC matrix inputted.(FIG1)

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Comments to this report:
satoru.ikeda - 14:13 Tuesday 11 June 2024 (29831) Print this report

Hirose-san, Ikeda

> We placed the BS after the shutter and tried to turn the HWP remotely, but we couldn't. Specifically, we turned it at ‘K1:SYS-HWP_IFO_REFL_WFS_STEP_TOTAL_DEG’. The number on the MEDM screen"K1SYS-HWP_CALIB.abl" changed, but the IFO REFL WFS HWP on REFL table did not turn. I couldn't resolve it within today's work, HWP remains as is. The power before and after BS is as follows. (PDFfile)

It worked fine as it was.

Procedure:.
1. check the connection of k1hwp4 (IFO_REFL_WFS) with the control PC
 Ping: OK, ssh: OK, lsusb: OK

2. connectors.
 => no problem
 
3. ran 10deg while watching HWP.
 Operation normal, but did not rotate the specified 10 deg.
 => Calibration is considered necessary.
 

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hirose.chiaki - 18:45 Tuesday 11 June 2024 (29836) Print this report

Thank you for checking WFS-HWP, Ikeda-san.

Since it was confirmed that WFS-HWP was turned, WFS-HWP was turned so that the input power of the WFS is the same power.

Details

Unlike in klog28114, it was 0.65W in front of WFSHWP, so we made the power in front of shatter into 1.71(0.65W/0.75W*2) times in this time. 
we made the WFS1 and WFS2 input power into 0.87(0.65W/0.75W) times from the power in front of WFSHWP.

  Position klog28114 Calculated from klog28114. This time after HWP turning note
① Before WFSHWP 0.750W   0.65W  
② In front of shatter 58.3mW 98mW (klog28114*1.71) 0.097W ＝③+④
③ BS3 trans     53.0mW =⑤+⑥
④ BS3 refl     50.2mW =⑦+⑧
⑤ PZT1 refl 22.2mW 19.24mW (klog28114*0.87) 19.3mW =WFS1 input power
⑥ PZT1 refl 36.3mW 31.46mW (klog28114*0.87) 32.5mW =WFS2
⑦ PZT3 refl     24.6mW =WFS3
⑧ PZT3 trans     25.8mW =WFS4
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