When slewing to next star, send M7 to default position and repeat.
New Alignment Sequence
Implemented January-July 2023
At stow:
M7 to default. Load default boxes on tel WFS. Load default flats on telAO and labAO.
Move Beacon flat to center beacon in ACQ hole.
Align TelWFS boxes to center on the red beacon.
Align blue beacon to labAO using dichroic.
Focus blue beacon on labAO and red becaon on TelWFS.
If aberration terms are high, ZERO CENTROIDS to adjust relative positions of the boxes.
Slewing to Star:
On first slew only, align red beacon to TelWFS boxes using beacon flat.
Align blue beacon to lab WFS using M7.
Focus blue beacon on labAO and red becaon on TelWFS.
Turn off red beacon.
Turn off blue beacon and lock star (TT only) - move TelWFS boxes to get star centered and evenly illuminated on ACQ hole.
Lock star on Tel AO - DM servo
Turn on blue beacon - lock LABAO servo
Turn on DM AUTO - use DM to correct tilt and offload to M7 when needed.
If coma and astigmatism high, create sky flat on bright star - Turn off [DM], [SV FLT], [FLATEN], then relock the [DM].
For IR combiners, move beacon flat to align star to STST.
For SPICA, move beacon flat to align star on SPICA FTT.
Star Acquired.
When slewing to the next star, DO NOT send M7 to default. If next star is bright align beacon flat to center star on STST/SPICA FTT. If star is faint, keep beacon flat fixed or align beacon flat to center red beacon in offset beacon boxes on TelWFS when repeating sequence.
Proposed Revisions to Current Alignment Sequence
chara/discussion_of_alignment_procedures.1710979687.txt.gz · Last modified: 2024/03/20 20:08 by gail_stargazer