• KAGRA
• Subgroups
• AOS
• TMSX_O3
• 2018-10-06

20181006

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=6452

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=6455

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=6458

Today's activities

Workers: Akutsu, K. Nagano

BRT part installation

• See here

GPT part installation

• We brought five QPD mechanical basis with plastic case which was used to store Dsub cables.
  • AFTER QPD INSTALLATION, WE SHOULD RETURN THE BOX TO 低音鏡機械室.
• After BRT part was installed and aligned, we started to install GPT part (in-air part).
• We found that damping of TMS-VIS was not necessary for GPT installation.

• Following the design, we installed the beginning part of the green light path, two periscope mirrors, two steering mirrors, and one lenses.

  • First periscope mirror (GPM1): TFM-50C080532 (Opto-Sigma)

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  • Second periscope mirror (GPM2): TFM-50C080532 (Opto-Sigma)

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  • First steering mirror (GST1): TFM-50C080532 (Opto-Sigma)

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  • Second steering mirror (GST2): TFM-50C080532 (Opto-Sigma)

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  • First lens (GLNS1, f=500): LA1380-A-ML (Thorlabs)

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• At first, all mirrors were installed. Then the lens was installed not to change beam position.
• The lens position, i.e. beam profile, was not tuned since the tuning was not so effective without arm cavity locked.
• In the end of today's work, we installed DC PD (PDA100A2, Thorlabs) after GST2 temporarily. The gain was set to 0 dB.

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• After all, GPT part looks like below.

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• The signal was checked like this.

  • Enomoto-kun kindly built model (k1aostmsx) and restarted k1dc0 to register channel for IR and Green DC PD befor the above klog6452.

Next plan

• Align and balance the BRT and the TMS-VIS.
• Configure the digital models properly.
• Detach the remaining white tapes just before closing the chamber; be noted that there are white tapes on the PEEK connectors at the inside of the flanges.
• Torque completely the bolts which are fixing the upper and the lower base plates.
• Insert metal gaskets before torquing the ICF203 flanges with Dsub connectors.
• Install optics after GBS1
• Install gigE camera
• Modify MEDM screen
  • Add DC PD and so on.

• Cable Dsub 15pin for TMS-VIS OpLev.

• Modify cabling for DC PD.
• Return plastic box.
• Install rails in digital rack.
  • They may be necessary under LVDT distributor, geophone distributor, and WHT board.
  • Nagano is not sure it is necessary under HP coil driver.
• Consider how to cable Dsub cables to QPD.

Wanted!

• A document for learning how to release or fix the suspended tables (by Uraguchi?).
• FIVE QPD electronics boards