• LCGT
• subgroup
• AOS
• WideAngleBuffle
• 2018-02-28

20180228

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=4296

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=4311

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=4313

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=4315

Today's activities

Workers: Simon, Akutsu

• Measured the current distance from the reflector to each photosensor head; X~18mm, Y~16.5mm, Z~17mm.
• Re-screwed M8 bolts of the heat-link anchor block to the cryo-head with M8 washers and spring washers; tighten.

• Picked a thermometer with Akutsu's gloved hand to check the difference of heat touching of the thermometer; see here

  • When I picked it during it was attached to the WAB suspension's top, the temperature rise was very small.

  • Then I detached the thermometer after waiting for the unpicked temperature got back, and picked it again and find the temperature rising was very drastic (quantitative report should be here, again)

  • Then I again attached it carefully, and checked the temperature rising, and this time the rise ratio was actually small (again.....)

• Re-centered the oplev.
• Miyo-kun started to re-assign the matrix from PS1, PS2, and PS3 to X, Y, and Z.

  • Should be reported later

  • This re-assign will (ex)change the channel names; to call back the past data, you need to know what was the channel name at that time... In other words, the name change won't change the past ch names!

• [Ongoing] Need cares of water springs from anchor bolts for oplev pylons.

• [Ongoing] Need to confirm what are the scratch lines made by the measurement by the KEK team last week.

Next plan

• Complete the PS calibration.
• Complete the calibration of the oplev; the arm length was reported by Simon, so....
• Complete the signal matrix.
• Lower the position of the WAB for cooling down.
• Make heat connection upper and lower part of the suspension by Cu wires.
• Make heat anchors for some electric wires in which large current will flow.
• Optimize the current amount to the coil.
• Check the balance of the suspended WAB with some wires and sensors are attached.
• Check how the damping would be now after the replacement of the damping magnets.
• Check the reproducibility of the alignment of the suspension among several modes.
• Check heights of several points.
• Take care of water spring??

Wanted!

• Two burndy connectors, vacuum compatible.

• Stages outside the chamber to ease wiping our legs.

• Good rail(?) to move the WAB suspension in the cryostat in the main beam direction.

• Chain block? to support the load in the chamber.

• A clock to know the time easily.
• M6 screw set.