wiki:HetProcedures/PreserveMoveDegradation

Preserve Move Degradation Tests

Given the problems with SAMS's "Set new reference (preserve move)" there's been some push to quantify the degradation after using it. The following are tests to do just that. They should ideally be performed in sequence, one immediately after the other, and all in all they take upwards of 1.5 hours.

These tests should be performed either when the telescope is idle due to non-threatening weather, or during appointed engineering time.

Regarding "but not too old," SAMS reference files which are too old can introduce more cumbersome problems than the test requires, since the mirror team may have made multiple physical changes to the array. The most recent SAMS reference that puts the tRSE between 200 and 300 is ideal.

A template for recording relevant values (and reminders to wait/take snap images) is below the test overviews below.


1.) Preserve Move Degradation Test

  • Restore an old (but not too old) SAMS reference which puts the tRSE between 200 and 300. Record the filename of the SAMS reference used.
  • Move to CCAS, move tracker to lower right.
  • Let the primary settle.
  • Run an s1 routine and record the RMS tip/tilt-GRoC values for this initial routine.
  • Record the offsets sent to SAMS by WaveScope? for this initial routine.
  • Stack left side of mirror until RMS tip/tilt-GRoC is 0.05 or lower. Record the final RMS tip/tilt-GRoC values.
  • Take a snap image in WaveScope? software: "snap pmtest_preYYYYMMDDpm"
  • Measure this stack of the left side of mirror with HEFI, record the resulting EE50/EE80 in the test notes only.
  • In SAMS: make sure the Tip/Tilt? Scale for the image of the primary with vectors is 0.1 if possible. Record the Tip/Tilt? Scale value and the Target RSE before using Set new reference (preserve move).
  • Set new reference (preserve move). Add "pmtest" to the beginning of the SAMS reference file name to indicate that this is not a truly stacked reference.
  • Save a .cur file in SCS with the prefix 'pmtest' and the rest of the filename like we would normally save it, with the temperature appended.
  • Set SAMS back to Operating, and record the Tip/Tilt? scale and Target RSE before setting SCS GUI Move Authority back to SAMS.
  • After waiting 3 minutes to let the mirror more closely resemble SAMS's model, measure with HEFI again, and record the resulting EE50/EE80 in the test notes only.
  • Run a final s1 routine and record the RMS tip/tilt-GRoC values for this routine.
  • Record the offsets sent to SAMS by WaveScope? for the final routine.
  • Take a snap image in WaveScope? software: "snap pmtest_postYYYYMMDDpm"


2.) Regular Set Reference Degradation Test

  • Restore an old (but not too old) SAMS reference which puts the tRSE between 200 and 300. This should be the same reference file as the first test.
  • Let the primary settle.
  • Run an s1 routine and record the RMS tip/tilt-GRoC values for this initial routine.
  • Record the offsets sent to SAMS by WaveScope? for this initial routine.
  • Stack left side of mirror until RMS tip/tilt-GRoC is 0.05 or lower. Record the final RMS tip/tilt-GRoC values.
  • Take a snap image in WaveScope? software: "snap pmtest_preYYYYMMDD"
  • Measure this stack of the left side of mirror with HEFI, record the resulting EE50/EE80 in the test notes only.
  • In SAMS: make sure the Tip/Tilt? Scale for the image of the primary with vectors is 0.1 if possible. Record the Tip/Tilt? Scale value and the Target RSE before using Set new reference.
  • Set new reference, without preserving move. Add "pmtest" to the beginning of the SAMS reference file name to indicate that this is not a truly stacked reference.
  • Save a .cur file in SCS with the prefix 'pmtest' and the rest of the filename like we would normally save it, with temperature appended.
  • Set SAMS back to Operating, and record the Tip/Tilt? scale and Target RSE before setting SCS GUI Move Authority back to SAMS.
  • After waiting 3 minutes for the sake of symmetry, measure with HEFI again, and record the resulting EE50/EE80 in the test notes only.
  • Run a final s1 routine and record the RMS tip/tilt-GRoC values for this routine.
  • Record the offsets sent to SAMS by WaveScope? for the final routine.
  • Take a snap image in WaveScope? software: "snap pmtest_postYYYYMMDD"


After both tests are complete, finish restacking the mirror. Under extenuating circumstances check the "Engineering" box. (It should be quick to complete after the test is finished.)

* * *

Below is the template for recording values, with reminders to take snap images and wait at the appropriate times. (Delete square brackets-- they're just to make it obvious where to record things.) 

SAMS reference used: [name of SAMS reference file]

With preserve move
==============================
Initial Target RSE: []
First RMS tip/tilt - GRoC: tip= [] tilt= [] ([completion time HH:MM])
Final RMS tip/tilt - GRoC: tip= [] tilt= [] ([completion time HH:MM])
(Take snap)
HEFI ee50: [] ee80: []
Pre-reference Target RSE: []
Pre-reference Tip/Tilt Scale: []
Post-reference Target RSE: []
Post-reference Tip/Tilt Scale: []
(Wait 3 minutes)
Post-reference HEFI ee50: [] ee80: []
Post-reference RMS tip/tilt - GRoC: tip= [], tilt= [] ([completion time HH:MM])
(Take snap)

Without preserve move
==============================
Initial Target RSE: []
First RMS tip/tilt - GRoC: tip= [] tilt= [] ([completion time HH:MM])
Final RMS tip/tilt - GRoC: tip= [] tilt= [] ([completion time HH:MM])
(Take snap)
HEFI ee50: [] ee80: []
Pre-reference Target RSE: []
Pre-reference Tip/Tilt Scale: []
Post-reference Target RSE: []
Post-reference Tip/Tilt Scale: []
(Wait 3 minutes)
Post-reference HEFI ee50: [] ee80: []
Post-reference RMS tip/tilt - GRoC: tip= [], tilt= [] ([completion time HH:MM])
(Take snap)
Last modified 6 months ago Last modified on Nov 21, 2023 10:42:09 PM