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Keck AO Operations

Keck AO Operations. D. Le Mignant for the Keck AO team. Topics. AO refresh AO operation at a glance About the operation tools Troubleshooting session. AO = Adaptive Optics. Control loop for canceling out the optical aberrations introduced mostly by the atmosphere (WFS, WFC, TT, DM,etc).

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Keck AO Operations

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  1. Keck AOOperations D. Le Mignant for the Keck AO team

  2. Topics • AO refresh • AO operation at a glance • About the operation tools • Troubleshooting session

  3. AO = Adaptive Optics • Control loop for canceling out the optical aberrations introduced mostly by the atmosphere (WFS, WFC, TT, DM,etc). • Tracking devices (ROT) and slewing devices (FSMs, FCS, FSS) • Telescope guiding and focusing. • Is this a transparent process?

  4. ROTPupil re-imaging DichroicTTDMFSMsWFS

  5. SoftwareArchitecture AO supervisory control Telescope DCS obs eng. screen Optics Bench Devices epics channels IDL pro files wfc eng. screen AOA camera Wavefront Controller slk Java User Interface Epics kwd server autom. units cshow

  6. AO at a glance: what it could be… • Run nighttime script • Slew to reference star • Acquire star on WFS • Run auto AO setting script • Go to next object • Acquire star on WFS • Etc.. • Run Halt AO script

  7. Nighttime script Slew, acquire reference star Check FSM POs and run auto AO setting Coordinate rotator slew Watch for problems etc Need to be simplified Ok, watch PO and/or use pixel location Reliable, yet not optimized for IF and survey mode Automation needed Auto-recovery and automation needed What is it :

  8. What has been our strategy so far.. • K2AO/K1AO need to be modified for dvlpt. • Yet, we routinely operate them for science. • After many years, OPS software still evolving.. • New feedback from OAs • Changes being implemented • AO handover will provide a strict baseline for NGS AO operation • Science version vs dvlpt version • Reliable, high performance and easy-to-use

  9. IDL JAVA JAVA IDL

  10. AO supervisory control Telescope DCS obs eng. screen Optics Bench Devices epics channels IDL pro files wfc eng. screen AOA camera Wavefront Controller slk Java User Interface Epics kwd server autom. units cshow

  11. IDL widgets and scripts AO Acquisition widget: • Watchdog tasks • Rotator, FSMs fault • WFC crash • Set AO! • Scripts: • Auto AO setting • Set FSMs • Set AO parms • Record WFS backgrd • Iterate once and exit • Auto-recovery scripts • AO/DCS coms • FSMs, Rot fault • Update Cog

  12. Java and other tools • Java screens • Some value displayed are - EPICS keyword server - automation units kwds • WFS config. / rot position call automation units

  13. IDL JAVA JAVA IDL

  14. The most common problems(random order) • WFC crash • FSMs Fault • Rotator Fault • DCS/AO communication • AO loops not closed • GUIs not responsive • Poor AO correction

  15. Telescope nod with AO • NIRC2: • sends nod request to telescope • waits for AO (wait4tt, wait4dm, wait4fcs) • DCS/AO handshake : • DCS • request to AO : pause • DCS : • moves telescope • request to AO : resume • AO: • Open AO loops (aoloop=open/restore) • acknowledges • AO: • converts nod in FSM X, Y moves • Send FSM moves • Close AO loops (aoloop=restore) • acknowledges • AO • In parallel to FSMs moves, WFS focus repositioned • NIRC2: • Resumes

  16. Nodding using FSMs • FSMs : 2 mirrors / 4 actuators + encoders • Moves image on the WFS • Maintains DM to lenslet pupil registration • --> Any coordinated moves requires driving all 4 actuators • Moves take <10sec • Tight space • See hardware

  17. AO/DCS communication • SC • TT offloading • Focus offloading • FSM nod • AO loops (aoloop kwd) • DCS • Telescope guiding • Secondary focus adjustment

  18. Restart AO/DCS communications • Open all loops (TT, DM, TT and focus offloading) • Set aoloop kwd to open • Reset automation units to record WFS background • Zero-out the DT control offset (used for DAR and KAT offload) • Reload the last-used centroid origin file for the WFC • Run DCS script to set AO TT offload as inputs for telescope guiding • Close TT and focus offloading • Does not close TT and DM loops

  19. Secondary Mirror Piston Telescope Pointing TTO WFO TT Loop DM Loop AO Loops DCS TTM Supervisory Controller Wavefront Controller WFS DM

  20. WFC crash (see web page) • WFC running at 672Hz • TT controller and DM controller, Fault likely comes from DM controller • Fault detection not obvious • Bad image quality! • WFS intensity not updating, wyko frozen • AO loops not responsive • Once Fault detected, one needs to reboot WFC • No Calibrations needed BUT need to run the nighttime script again and auto AO setting script • We are working on • Better fault detection • Full auto-recovery script

  21. Rotator operation • Rotator is a tracking device with two modes (Position Angle, Vertical Angle) • Position is fixed by the astronomer • Rotator slew are cumbersome: • AO loops open • Star on-axis (within few arcsec) • After rotator slew • Close loops • Wait for new reconstructor

  22. Rotator fault • OBS/DCS communication used to drive the rotator • Fault modes: • Invisible: rotator does not report any fault • But acquisition does not work • Visible: FACSUM reports FAULT • Mechanical? OBS/DCS coms? • See web page for troubleshooting

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