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| * Pitch/height alignment | * (Pitch and )height alignment |
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| * Yaw and X-shift (translational) alignment * Note that the three foots of the BRT base plate were still loosen and the BRT was hooked up by the crane. * First I tried to rotate the base plate to align the green beam to the iris-1. * But the right rotation direction was opposite against what we expected... * Found it was impossible to say the '''''initial''''' position and alignment of the BRT was ACTUALLY nominal. * a |
20180327
Today's activities
Workers: K. Nagano, Yokogawa, Ko. Yamamoto, Sugimoto, Akutsu
- After Uchiyama-san allowed to turn on the green laser, we did it, and went to EYT.
- Tried to check the current situation, but the green beam got crazy many times.
- The cause was not still clear but probably due to the BS suspension's something...
Brought several optical parts and the holders; see here
- Preparations to align the BRT.
Attached a diaphragm (or iris) after the 2nd BRT lens; call iris-1.
Attached another iris (iris-2) between the 2nd mirror and the 2nd BRT lens.
Then the reference for the alignment work is the beam positions on the two irises along with the beam position on the 2nd mirror; see here
- Loosened the foots of the BRT base plate, and hook up it very slightly.
- (Pitch and )height alignment
- Found the beam position was relatively down ... to the height of the goal!
- So it seems, in addition to the pitch alignment on March 22, needed to do the height adjustment.
- So did a half rotation (about 180 deg) to each leg of the BRT; each leg part (misumi SGKS10-50) has M10 screw, meaning 1.5 mm pitch, so the half screwing down each would lead 0.75 mm up of the base plate when it went back to sit on the fixed stage.
- Still the beam position is higher than the irises, we stopped the pitch and height alignment.
- Yaw and X-shift (translational) alignment
- Note that the three foots of the BRT base plate were still loosen and the BRT was hooked up by the crane.
- First I tried to rotate the base plate to align the green beam to the iris-1.
- But the right rotation direction was opposite against what we expected...
Found it was impossible to say the initial position and alignment of the BRT was ACTUALLY nominal.
- a
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)