• LCGT
• subgroup
• AOS
• WideAngleBuffle
• 2018-02-01

20180201

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=4091

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=4090

Today's activities

Workers: Akutsu, Miyo, Hasegawa

• Continued to attach burndy receptacle pins to the thermometers' wires.

  • Now 6 thermometers have pins; 5 out of 6 thermometers were online by a cryocon; the five were attached to the WAB and the suspension without indium sheet, so don't forget to attach the metals sheets

  • The coat of a red wire of one of the thermometer was adhered to its green wire's coat, and tended to delaminate. Doing some tricky and careful works, this issue was resolved; again, careful visual inspection would be a key to resolve an issue.
• Attached burndy receptacle pins to two heaters in the chamber
  • The two heaters were connected in parallel; in other words, two wires from different heaters are swaged to a single pin.
  • Tested the heater via the distributor located outside of the clean booth; one person in the chamber touched the heater with gloved hand but did not feel any warming up; with a contact-type handy thermometer, found the rise/drop of the temperature of the heater along with the switch turned on/off.
  • The resistance between W-X from P23 at the distributor box was measured as 32.5 ohm, while a heater is 50 ohm on the specification, and that of the paralleled heates was measured 25 ohm as expected.
• Set up the oplev; the pylon was rigidly fixed to the floor; an ND filter, borrowed from Kokeyama-san, was put in front of the QPD.

• Calibrated the QPD of the oplev. See here; need to do further conversion to urad.

• [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 calibration of the oplev; what is the arm length?

• 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.
• Prepare calibration of photosensors.
• Check heights of several points.
• Wash the coil in ethanol at Univ. of Toyama...?
• Take care of water spring??

Wanted!

• A tweezer.
• Two burndy connectors, vacuum compatible.
• Chairs in the clean booth
• Cutters and scissors!!

• 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.