P1.6 Cryostat cool down

• Phase : 1
• Status : Draft
• Category : Unpack, Assemble, and Verification (C1)
• Recurrence : once
• Duration : 0.5 day

Description

• Cooldown the cryostat.

Prerequisites

• SHARK-NIR connected to LBT network.
• Electronics cabinets on.
• Needs vacuum pumping at the beginning (vacuum pressure of 10e-5 Torr is good (see the cryostat manual SHARK-NIR_SO-MAN-001)).

Procedure

• Start the cryostat cooling down sequence (see the cryostat manual SHARK-NIR_SO-MAN-001).
• Check how the system performance every 30 minutes.

Templates

Success criteria

• Cryostat cooled down without any issues.
• The temperature at the detector is stable at ~78K.

Notes

• This activity can run in parallel with other cleanroom activities (which do not need a cold detector).

LBTO support

• Liquid Nitrogen refill is required in the cleanroom.
• Vacuum pump and support for cooling down the cryostat. We do not yet the dimensions of the vacuum pump and how the LN2 refill will take place. If they will be done using long hoses then both vacuum pump and LN2 tank can stay outside the clean tent.

Date performed and by whom