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Procedure: LGS Spectroscopic Acquisition

Introduction

Short description of the objective of the procedure(s).

Standard Procedure:

1: Pre-alignment using 9th magnitude star

  1. Open loops in ShaneAO loop control GUI.
  2. Back On-Axis in fieldsteer.tcl GUI, ensures field steer motors restored to on-axis position.
  3. Back to target in Offset from Target GUI, ensures no telescope offsets.
  4. Open loops in ShaneAO loop control GUI.
  5. Mirror position 2 in sdiagmir_fe GUI. Acquire 9th magnitude alignment star in guide camera.
  6. Load shutdown file in lsm.tcl (Laser Shutdown Monitor).
  7. Check TUB rotation (74.0) in aotelcoc.
  8. For corresponding science target, determine TUB(Slit) by setting Desired PA in fieldsteer.tcl GUI.
  9. Rotate TUB to TUB(Slit) value and (re-)place target on boresight.
  10. Mirror position 3 in sdiagmir_fe GUI. Close TT loop in ShaneAO loop control GUI. Allow to offload. Open loops.
  11. Mirror position 2 in sdiagmir_fe GUI. Propagate and steer laser to target/boresight.
  12. Mirror position 3 in sdiagmir_fe GUI. Close TT loop in ShaneAO loop control GUI. Close Uplink TT loop in ShaneAO loop control GUI. Check offload values. Close WFS loop in ShaneAO loop control GUI.
  13. If desired, take optimization exposures via sharcs_fe GUI, with filters configured via ShARCS wheel control.

2: Tip-Tilt Star Acquisition

  1. Open loops in ShaneAO loop control GUI.
  2. Back On-Axis in fieldsteer.tcl GUI, ensures field steer motors restored to on-axis position.
  3. Back to target in Offset from Target GUI, ensures no telescope offsets.
  4. Open loops in ShaneAO loop control GUI.
  5. Mirror position 2 in sdiagmir_fe GUI. Acquire Tip-Tilt star in guide camera.
  6. Load shutdown file in lsm.tcl (Laser Shutdown Monitor).
  7. Check TUB rotation and TUB(Slit) value in aotelcoc.
  8. Mirror position 3 in sdiagmir_fe GUI. Close TT loop in ShaneAO loop control GUI. Close Uplink TT loop in ShaneAO loop control GUI. Check offload values. Close WFS loop in ShaneAO loop control GUI.

3: Offset from Tip-Tilt Star to Science Target

For the following it is recommended to inspect displays WITHOUT badpix map in Image Browser and with reference to FullImage in sharcsdisp.
  1. Use Telescope Move in fieldsteer.tcl GUI to steer science target into ShARCS field-of-view.
  2. Take test image(s) via sharcs_fe GUI, with filters configured via ShARCS wheel control. Determine centroid coordinates of science target.

4: Position Science Target Coincident with Slit Center

For the following it is recommended to inspect displays WITHOUT badpix map in Image Browser and with reference to FullImage in sharcsdisp.
  1. Take through-slit image(s) via sharcs_fe GUI, with slit configured via ShARCS wheel control. Determine center coordinates of slit.
  2. Use Move Tel in Image Browser (altertnatively Move Star in fieldsteer.tcl) to position target on center coordinates of slit.

5: Execute Science Exposures, with Dithering Along Slit

For the following it is recommended to inspect displays WITHOUT badpix map in Image Browser and with reference to FullImage in sharcsdisp.
  1. Execute exposures at 3 positions (starting position and 1 adjacent position approx 2 arcsec each side of starting position):

    user@shard.ucolick.org:/local/u/user/observers/lgs/scripts/slitpa-lgs 1

    The integer argument dictates how many repeat exposures should be taken at each of the 3 positions along the slit.


Appendix 

 
    
   Verbatim content of relevant extract.

This document last updated (UTC): Tuesday 04 March 2025