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VIS (IY)
yoshinori.fujii - 21:24 Thursday 08 November 2018 (6915) Print this report
Cryo-payload, connected to the tower

Tomaru, Araki, M. Takahashi, Sawada, Satou, Fujii, R. Takahashi (remotely),

= ITMY =
The cryo-paylaod has been connect to the tower part successfully. Now past-work is ongoing.

== Brief procedure (in terms of VIS) ==
-- suspend the payload to the BF-GAS-keystone,
-- release F0-GAS-keystone,
-- attach F0-Yaw stepping motor system (temporal one) to the F0 keystone,
-- replace the temporal EQ-stop screws on the keystone with the correct ones (at F0 stage),
-- attach the yoke with magnets at F0 stage,
-- set the F0-keystone height to 16 mm from the upper ring and lock the position,
-- change the BF-body height to lower position (by 10 mm, the height was 60 mm in average (this values were measured at 3 points and they were 60/60/60.5mm))
-- adjust the load on the payload so that the BF-keystone height is at nominal position (The target was about 1000 count in K1:VIS-ITMY_BF_LVDTINF_GAS_IN channel, in the real life, it was around 520 counts. it was confirmed that F1/F2/F3/BF-GAS keystones were freely oscillating at that time.)
-- measure the height of the TM (compared with the center of the beam tube)
  -- The height measured lower than the center of the tube by 6.3 mm (while the target was lower than 10 mm). This value should be updated after finly mass-tuning (*1)

== Technical notes ==
(*1) Now the keystone height is set at about 520 counts and the height of the TM was lower than 6.3 mm from the center of the tube, HOWEVER, this mass-adjustment was done before the cabling around the payload was done, and thus after the cabling, finely mass-tuning is to be done.
-- BF height/torsion compenstation is to be done with tower-GAS-filters after releasing F0-GAS-keystone.

== Other notes == 
-- the photos are stored in https://photos.app.goo.gl/jG5vRo1ZCgNvype36
-- more detailed (planned) procedure is also attached.

Non-image files attached to this report
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