[INSTRM-2059] Allowing short exposure time in the first three FPS iterations Created: 17/Aug/23  Updated: 30/Aug/23  Resolved: 30/Aug/23

Status: Done
Project: Instrument control development
Component/s: ics_fpsActor
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: chyan Assignee: chyan
Resolution: Done Votes: 0
Labels: EngRun
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified


 Description   

To optimize the FPS sequence, it is requested to use shorter exposure time in the first three iteration. FPS actor needs to address the requirements.



 Comments   
Comment by yuki.moritani [ 24/Aug/23 ]

(Recording)
At ICS/PFI+MCS telecon on 18 Aug 2023, it was pointed out that Cobras should not stop (i.e., not be flagged as converged) until MCS image is taken with longer exposure.

Comment by chyan [ 25/Aug/23 ]

After thinking carefully, I decide not to implement Cobra-not-stop strategy because of few evidences.

  • We have used short exposure time in many convergence runs and diagnostic plots show that the converged cobras reported from FPS and MCS at first three iterations are very consistent. That means our strategy is correct in first place.
  • This evidence is also observed in longer exposure time convergence run.
  • In another aspect, implementing the cobra-not-stop strategy will changed the strategy that has been working for many engineering runs.
  • Therefore, implementing the cobra-not-stop at first three iteration strategy introduces another uncertainty and it should be another ticket.

Giving that, let's make it simple. We solve this ticket first. Then creating another ticket to address Jeniffer's suggesting.

Comment by chyan [ 30/Aug/23 ]

This ticket is tested on the Unit Selector, close the ticket.

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