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VIS (EY)
ryutaro.takahashi - 21:18 Thursday 11 February 2021 (15993) Print this report
Setup of F2

[Takahashi, Sato, Horiuchi]

We setup the F2 stage.

  1. Tuned the F2 at the mid point (41mm in height) of FR (see plot #2). Base weight was 90.46kg.
  2. Checked the range of FR (see plot #3).
  3. Fiexd the ballast masses on the BF cup.
  4. Released the F3 keystone. The M6 long nut (24g) was removed and  a18-g washer was added.
  5. The motion of F3 was not smooth. Lifted up the EQ stop to access the secondary coil.
  6. Adjusted the height of secondary coil from -11.0/-11.5/-13.5mm to -15mm in the F3.
  7. The calibration curve for F3 was shifted by 3mm.
  8. Lifted down the EQ stop.
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ryutaro.takahashi - 12:45 Friday 12 February 2021 (15997) Print this report

[Takahashi, Sato, Horiuchi]

  • Released the F3 and the F2 keystone. Checked the LVDT signal. The present counts are around 3600 for BF, 9900 for F3, and 3900 for F2 respectively.
  • Fixed the cables on the bottom of F2 temporally.
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ryutaro.takahashi - 21:35 Monday 15 February 2021 (16023) Print this report

[Takahashi, Horiuchi, Miyo(remote)]

  1. Measured the TF of F2.
  2. Closed the cup of F2. The keystone went to the upper limit.
  3. Added the ballast of 1.12kg on the F3. The height of F2 keystone was around 200count.
  4. Measured the TF of F2.
  5. Hang the F2. The keystone went down.
  6. Removed the ballast of 0.44kg. The total additional mass was 0.68kg. The height of F2 keystone was around 1100count.
  7. Lifted down the F2.
  8. Fixed the additional ballast on the cup of F3.
  9. Fixed some cable-connectors on the side plate of F2.
ryutaro.takahashi - 17:07 Tuesday 16 February 2021 (16034) Print this report

[Takahashi, Sato, Horiuchi]

  1. Measured the spectrum of F2 in the fixed keystone.
  2. Fixed remaining cable-connectors on the side plate of F2.
ryutaro.takahashi - 20:28 Wednesday 17 February 2021 (16050) Print this report

[Takahashi, Sato, Horiuchi]

We almost finished the F2 stage and started the F1 stage.

  1. Checked the connectablity of cables. Some cable-connectors need to be repaired.
  2. Released the side and bottom stoppers for the F3.
  3. Lifted down the EQ stop into the corrugate tube.
  4. Put the end plate for the F2 on the frame lock.
  5. Installed the F1 into the clean booth.
  6. Hang the F2 from the F1 with the wire(#320). The height of keystone of F2 was -3300 in count.
  7. Replaced the side stoppers on the end plate for the F1.
ryutaro.takahashi - 13:09 Friday 19 February 2021 (16063) Print this report

Measured TFs without the cup, with the cup, hang by the crane, and spectrum of fixed keystone are shown.

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