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R&D (Cryogenic)
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SatoshiTanioka - 18:46, Thursday 24 October 2019 (1768)Get code to link to this report
Work on Cryostat

[Namai-san, Ueda-san from KEK, Sato-san, and Tomaru-san]

We worked on the cryostat in ATC to install adapters for windows on 80K shield.
What we did is as follows:

  1. Attached the adapters on 80K shield
  2. Adjusted the insulator on 80K shield not to touch the 300K shield
  3. Removed 300K shield for temporary and install 80K shield
  4. Re-installed 300K shield
  5. Re-located the chamber to install the cold head and bellows
  6. Installed an optical breadboard and connected to cold head with grease

Since we don't have indium sheet, we used grease to contact with cold head.
Though this grease can be used in vacuum (~10^-7 Pa), if the contamination on mirrors become a problem, we will remove the grease and use indium sheet.

The remaining tasks are:

  • Install modified 4K shield, and windows on 80K shield
  • Cabling
  • Vacuum check
Images attached to this report
1768_20191024114542_20191024adapter.jpg 1768_20191024114547_20191024bar.jpg
Comments related to this report
SatoshiTanioka - 18:12, Monday 28 October 2019 (1775)

Today I temporary installed the adapter flange and 4K shiled inside the cryostat chamber to confirm the screw hole position is correct.
The adapter flange and shield seemed to be O.K., but I need 10 more ultrasonic cleaned M6 screws.

In addition to that, we need super insulator on 4K shield and tape to fix cables.

The procudure for remaining tasks are:

  1. Prepare windows for 80K shield
  2. Install windows on 80K shield
  3. Cabling on 4K shield
  4. Attach SI on 4K shield
  5. Install 4K shield
SatoshiTanioka - 14:08, Wednesday 30 October 2019 (1779)

This entry is log on 28th Oct.
I cut some teflon sheet for cushioning between glass window and adapter.