== Testing stack stability after large piston moves ==

This procedure is intended to test how well M1 retains its alignment after a series of large piston moves. It should leave the mirror in good shape, but be warned that in the worst case scenario a second stack may be required.

Here's the procedure:

1. Do a stack
   a. Note that the {{{s1}}} iterations are saving their corrections to these files:
{{{
wave: E:/CorrectionsPlotting/YYYYMMDD/YYYYMMDDThhmmss.ttp
}}}
2. Do the normal stack measurement (HEFI + extra-focal)
3. Let SAMS "settle down" to stabilize, 2-3 min? TO use their intuition
4. Hand over to Chris for him to do the piston moves. He will:
   a. disengage SAMS (stop SCS from listening, no move authority)
   b. execute piston step-through motion script on ~20-24 segments, moving in 100um steps for a 500um range
   c. return all segments to their nominal/zero piston positions
   d. engage SAMS
   e. hand back to the TO for the next steps
5. Let SAMS "settle down" to stabilize, 2-3 min? TO use their intuition
6. Do a normal stack measurement (HEFI + extra-focal)
7. Do an {{{s1}}} iteration (corrections automatically saved)
8. Consider saving another reference here if there was a big change (TO use their judgement)

If the stack looks good, continue with your night. If it looks bad, a re-stack may be required before resuming science operations.