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ryutaro.takahashi - 17:20 Monday 15 March 2021 (16260) Print this report
Connection of cryo-payload

[Takahashi, Sato, Horiuchi + CRY]

We connected the cryo-payload to the BF.

  1. Brought the BIO shassis from IY to EX.
  2. Connected the outer cables to the feedthrough for the release sensors (F1, F2, F3, BF).
  3. Inserted the exchange cables between the shassis and the outer cables.
  4. Connected the D-sub 37pin cables from the 32-bit IO port on the shassis to the DGS with the BIO checker. 
  5. Confirmed  the signal of F1 and F2 in the BIO checker.
  6. Pushed back the F0 keystone by 15mm.
  7. The cryo-payload was installed into the cryostat.
  8. Pushed down the F0 keystone by 29mm.
  9. Set the BF height to 75mm.
  10. Adjusted the ballast masses on the PF. Finally the BF keystone was set to 1270count.
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ryutaro.takahashi - 20:41 Tuesday 16 March 2021 (16271) Print this report

[Takahashi, Sato, Horiuchi]

  1. Inspected inside the cup of BF wiith a fiber scope. The FR was around center height. The yaw picomotor is in the CCW side.
  2. Lifted up the F0 keystone. The BF was released from the bottom stopper of 75mm by 1mm at the F0 height of -13mm. The keystones of F1, F3 and BF went to free, but the keystone of F2 was in upper limit (the same status in O3).
  3. Exchanged the stoppers (short/long M8 screws) for F0 keystone. Put the top plate with the yaw FR on the F0 keystone.
  4. Replaced the side stoppers for BF from the old type to the IX/IY type.
  5. The F0 was overloaded. The compression for all GAS blades was decreased to 13mm, but the F0 did not go to free. 
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ryutaro.takahashi - 15:24 Wednesday 17 March 2021 (16275) Print this report

[Takahashi, Sato, Horiuchi]

We measured amount of the F0 overload. It was 13kg.

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