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20180228
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.