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- Cover the IGRINS entrance window
- If the calibration unit is still on the cryostat, close the calibration unit slide window
- Otherwise, place the metal cover over the cryostat entrance window
- On the ICC shutdown the DTP, QLP, and SCP. It is useful to keep the HKP running for temperature monitoring and logging.
- Home the calibration motors:
- Open a terminal window and type “cd ~/igrins_admin”
- Close the HKP
- Type “python mtini.py”
- Follow the commands of that program to home each motor
- Restart the HKP after completion
- Detector Shutdown:
- Using “Remote Desktop Connection” log onto each of the three detector computers to shutdown the detectors and Jade2 cards.
- IP Addresses for each computer are listed here:
- SVC: 192.168.2.4
- H: 192.168.2.5
- K: 192.168.2.6
- When logged into Windows navigate to the “HXRG Testing Software” window.
- In the top left panel, press the “RESET ASIC” button. This will grey out most of the other options on the panel.
- In the top left panel, uncheck the “ASIC Main Power” box to power down the detector.
- Close the “HXRG Testing Software” window
- Navigate to the “HalServiceApp” window.
- Press the “Stop” button.
- Close the “HalServiceApp” window.
- Using the Windows Start menu shut down the computer.
- IP Addresses for each computer are listed here:
- Using “Remote Desktop Connection” log onto each of the three detector computers to shutdown the detectors and Jade2 cards.
- The IGRINS DSC will normally be left running at all times, but if you need to shut it down:
- On the ICC, open a “Remote Desktop Connection” to 192.168.2.1
- Once logged into the DSC, shut down the DSC with the normal Mac OSX shutdown command.
- Unless necessary, leave the ICC and HKP running to maintain temperature logging during warmup. Otherwise, shutdown the ICC using the normal Mac OSX shutdown command
- Turn off the helium compressor by flipping the white and yellow switches to the off position. This will stop cooling IGRINS.
- Wait at least one minute to release latent heat from the helium and then turn off the recirculating water chiller and the coolant booster pump.
- Remove all electrical connections from the calibration unit
- Three Ethernet motor controllers
- Two locking power cables
- One locking circular connector
- MAKE SURE THAT THE JADE2 CARDS HAVE BEEN TURNED OFF IN SOFTWARE BEFORE PROCEEDING!
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- Remove the Ethernet and power cables from each of the Jade2 cards.
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- Remove the helium flex lines and refrigerator power cable from IGRINS, place dust caps on the ends of each helium line fixture
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- Wait for IGRINS to warm to room temperature
- If you passively let IGRINS warm to room temperature, this takes about 40 hours.
- You can decrease the warm time by using the heater ramp function on the bench heaters only.
- DO NOT APPLY RAMP HEATING TO THE DETECTORS!
- To further decrease the warming time, you can backfill the dewar with dry nitrogen, but this is not recommended.
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- When all of the internal temperature sensors are approximately at room temperature you can gently release the vacuum using the valve.
- Remove the plastic dust cap from the vacuum valve flange
- Place clean tissues in front of the flange to filter out dust
- Release the lock on the red valve handle by turning it CCW
- Gently open the valve by turning it CCW. You will begin to hear air entering the cryostat. Try to limit the airflow to prevent damage to internal components
- In general, keeping the backfill noise at the same volume as a whisper will prevent damage.
- When the cryostat is backfilled, fully open the vacuum valve and replace the plastic dust cover.
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- Remove the pressure sensor cable
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- Remove the three temperature sensor/heater circular cables labeled A, B, and C from the cryostat.
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- Turn off the main power to the electronics box and secure all remaining cables to the box.
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- Remove the orange IGRINS fiber connection from the network switch in the electronics box.
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- The calibration unit may be removed or left on the cryostat at this time.