= 20180322 =
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4522]]
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4520]]
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4523]]
 * [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4525]]

== Today's activities ==
Workers: Yokogawa, Sugimoto, Akutsu
 * Yokogawa and Sugimoto did the fine tuning of the green beam alignment in the morning; see [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4522|here]].
 * Afternoon we tried to align the BRT by using the green beam as a reference.
  * But BS tended to get sudden excite!! so the beam tended to start dancing. It was so tough.
 * In the beginning, the beam was, in average, found at the lower left within the 2nd BRT lens (looking at from the backside, so -Z (lower) and -X (left)).
 * Using a laser leveler, we started with somehow finding which points the beam was going.
  * Oh, I should bring the Mitaka setup!
  * Using a pillar as a '''''reference''''', after the 2nd lens, it seemed
   * At 6x25= about 150mm away from the 2nd lens's leg: -X 10mm, +Z 17mm (in the interferometer global coordinate)with respect to the '''''optical axis of the BRT''''' (we need a reference, and used this, made by the laser leveler).
   * At about 25mm away from the 2nd lens's leg: -X 10mm, +Z 13.2mm
   * So it seemed shifted to -X, and tilted to pitch (17-13.2)/(150-25) = 0.0304 rad.
   * Considering (a) the input beam line is 1/300 tilted (in +Y direction lowered), and (b) the telescope is about 1/10 magnification (oh... what's the definition of "magnification!"), and (c) assuming the BRT was set horizontal, the pitch number above can be explained; 1/300-rad tilt will be '''''enhanced''''' by 10 times to be 1/30 = 0.0333... rad. (I did not remember well but the actual magnification was around 11 so it is very likely.)
  * So we tried to tilt the BRT itself by about 1/300.
   * We hooked up the BRT slightly after slightly loosen all the screws that fix the three legs of the BRT to the fixed stage.
   * And then changed the length of each leg so that 1/300 tilted; the sticking-up length of the leg at (+X and -Y) = 16mm, (-X and -Y) = 16mm, (Center +Y) = 19mm.
   * Then hooked down the BRT and tighten the leg screws.
  * At least for pitch, the beam height seems ok. But our time was up and will check later in detail.
  * Some consideration for the ghost beam is [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4523|here]].

== Next plan ==
 * Measure the height with a laser leveler?
 * Locate the BRT on the stage base on XXX as references.
 * Make GPT on the optical table
 * Make a model to drive signals from the TMS
 * Check the response of the TMS by swinging BS, PR2, PR3... etc... with commissioning people
 * Endのend用のフランジとりつけ。たぶん最後のほうで。
 * そこのフランジにとりつける透過光用ビューポート。まだ柏にあるはず。
 * 外側の光学定盤の上の取り回しを考えよ。

== Wanted! ==
 * '''''Four M10 eye bolts'''''
 * M8 SDC bolts? to tighten the top plate to the stage body are '''''shortened'''''!
 * Markers (black and white)

== From VIS ==
 * Four clean slings (from Hirata-san)