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   * 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.    * 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.

20180322

Today's activities

Workers: Yokogawa, Sugimoto, Akutsu

  • Yokogawa and Sugimoto did the fine tuning of the green beam alignment in the morning.
  • 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.

    • 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.

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)

KAGRA/subgroup/AOS/TMSY1/2018-03-22 (last edited 2018-03-23 08:08:16 by TomotadaAkutsu)