= 20180223 =
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4274]]


== Today's activities ==
Workers: Simon, Miyo, Akutsu
 * Reconnected the coil's pins to 4-ohm ones; from U/V to C/D in P23.
 * After several trials, realized 20V 1A to the coil made the WAB moving.
  * The 1A was consistent with our experience at Mitaka in spite of the magnets had been Neodymium but now SmCo.
  * The supplied current was able to be monitored at the display on the power supplies, but the current got reducing step by step... firstly I was surprised, but this could show the resistance was increasing; I observed the current got down to 750mA (I have no idea if this would have reach in equilibrium); Simon touched the coil with gloved his finger and felt warm.
  * Well, don't keep the current turned on.
  * The power supplies are Matsusada Precision [[https://www.matsusada.co.jp/pdf/p4k-80.pdf|P4K-80L]], which Akutsu brought two from Mitaka; they can output 16V max, so I connected them serially.
 * Attached 470nF parallelly to the transimpedances in the OSEM satellite box [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4897|S1604897]] that drives all the photosensors.
  * With the circuit, broad strange noise in the output from the photosensors are reduced to reach ADC noise level... '''''to be reported in detail'''''
 * Measured the damping behavior by exciting the WAB suspension by the coil actuator, and observed by the photosensors (3DoF: X, Y, and Z) and the oplev (2DoF: pitch and yaw)
  * '''''To be reported'''''
 * (CAL people installed a TCam to see IYC, and now pictures of the WAB can be shot!)
 * '''[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; the arm length was reported by Simon, so....
 * 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.