Shutdown¶

Overview¶

Auxtel might need to be shutdown for a few reasons:

End of night
Bad weather (see AuxTel Weather Constraints)
Restart of cRIOs (see e.g. ATDome Lost Communication with the Top-End)
Unresponsive axes

For the end-of-night shutdown, ATTCS and LATISS CSCs should be set to STANDBY. Telescope and dome should be parked. The parking position for AuxTel is El = 80 deg, Az = 0.0 deg, rot = 0.0 deg. For the dome, the parking position is at Az = 285.0 deg with closed dome slit shutter.

See the following procedures steps for the shutdown process.

If the shutdown is only temporary, and operation is to be resumed, follow the Resume From Temporary Shutdown block for extra procedures.

Precondition¶

Stopping Scheduler¶

The Scheduler automatically adds new targets to the queue until the start of nautical morning twilight. If there are no targets, the Scheduler will stop adding new ones. If you need to stop the Scheduler manually, you can use the auxtel/scheduler/stop.py script from ATScriptQueue without any additional configuration.

See more detailed descriptions on stopping the scheduler.

Post-Condition¶

Status of Telescope and Dome
Status of Mirrors and Mirror Covers
Status of CSC components of ATTCS and LATISS

Procedure Steps¶

Shutdown AuxTel¶

After stopping the scheduler, you can shutdown AuxTel using auxtel/shutdown.py script from ATQueue. without any configurations as below.

This script performs the following steps:

Closing the M1 cover: First, it disables ATAOS corrections. Then, it closes the M1 cover and vent gates. If mirror is opened, auxtel/shutdown.py script will not able to close the dome slit.
Closing the Dome Shutter: It closes the dome shutter if it is opened. If the dropout door is open, you can close manually via button at the AuxTel or with auxtel/atdome/close_dropout_door.py script without configuration.
Parking the Dome: The parking position is Az = 285.0 deg. Then, the dome following is disabled after parking.
Parking the Telescope: The parking position is El = 80 deg, Az = 0.0 deg, rot = 0.0 deg for AuxTel telescope. Tracking will be stopped.
Putting ATTCS CSCs in STANDBY: The AT CSC components ATMCS, ATPtg, ATDome, ATDomeTrajectory, ATAOS, ATPneumatics, ATHexapod will transition to STANDBY.

After parking and shutdown for Auxillary Telescope are completed, you can check the status of dome and telescope on LOVE.
Send LATISS to STANDBY: After parking the AuxTel and taking daytime calibration, the LATISS CSCs are still in ENABLED state. Run auxtel/standby_latiss.py on ATQueue to transition all CSCs for LATISS (ATCamera, ATOODS, ATHeaderService, ATSpectrograph) to STANDBY.

Ending the Night¶

During the shutting down procedures, you can check and complete all logging and administrative tasks including:

Finish filling out the night log, including time loss, weather loss, and gathering fault reports for the night.
Send the summary and night log link to rubinobs-nightlog mailing list (rubin-night-log [at] lists.lsst.org).
Leave the summary of the night on channel #summit-auxtel.

Closing the Vent Gate¶

Link to Remote Control of Vent Gate and Extractor Fan:

https://rubinobs.atlassian.net/wiki/spaces/OOD/pages/559349883/Remote+Control+of+Vent+Gate+and+Extractor+Fan

Follow the steps at the end of night:

Remotely close the extractor fans and vent gates
On the way to the hotel, go to Auxtel for a visual check of the above, and make sure the dome shutters are closed.

Resume From Temporary Shutdown

Auxtel loses pointing correction and focus information after a standard shutdown. In the case when observation is to be resumed after a shutdown, the following two steps need to be executed in order:

See also Center, absorb pointing offsets, mirror alignment and focus for more details.

Contingency¶

In the event that this standard dome and telescope closure procedure fails, and an emergency shutdown is required, refer to the emergency dome closure instructions.

This procedure was last modified on Apr 14, 2025.