= 20180301 =
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4331]]

== Today's activities ==
Workers: Simon, Miyo, Akutsu
 * Checked and identified each thermometer on the WAB and the suspension.
  * First fixed the WAB again.
  * Dhecked whether their thermal contacts were nice. Seemed [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4331|are]].
  * Each thermometer was fixed with a M3 short screw, the washer, and the spring washer.
 * Checked several screws, taking advantage of the fixed state of the WAB.
  * M5 nuts to tighten the heat links to the WAB. '''''It was a hard work as the space was too narrow...'''''
  * Heaters.
 * Lowered the WAB to the nominal position at the room temperature; details [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4331|here]].
  * First stood a vertical ruler and illuminated it with a laser leveler that was shooting the center of the WAB in the vertical direction.
  * Then lowered the laser lever by 2mm.
  * Loosened M3 screws on the top of the suspension, then rotated three vertical adjusters there, and then tightened the M3 screws.
   * The vertical adjusters were rotated in a single counterclock wise to lower the WAB while the WAB was fixed; meaning the vertical springs were slightly loosened at that time.
  * Removed the protectors so that the WAB was suspended/floating again.
   * As foreseen (not wanted), one of the vertical spring said "beeeeeen" slightly but other than that, no big issues happened, fortunately.
  * Confirmed the again suspended WAB's center line was consistent with the laser leveler's illuminating line! '''''WE DID IT!'''''
   * Actually we should not/need not to do this work for the actual integration procedure of the WAB; it should be suspended in the position of the room-temperature nominal position. Otherwise it would be dangerous to do this kind of work with an actual sapphire mirror will be there...
 * Reset relative positions of photosensors; Simon measured/set each 18mm.
  * Will increase to 20mm gap in the Z direction when it will be cooled down. 
 * Found the ''optimal'' amount of the current to the coil in the current situation.
  * Because the distance between the coil actuator and the magnet on the WAB got close, the 1A would be too large.
  * Found 0.5A was sufficient. Less would work.
 * '''[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 ==
 * 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.
 * Complete the PS calibration.
 * Complete the calibration of the oplev; the arm length was reported by Simon, so....
 * Complete the signal matrix.
 * 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.