[PIPE2D-529] Estimate the exposure times for the defocused data experiment with SM1 on Subaru Created: 26/Mar/20  Updated: 05/Jan/21  Resolved: 23/Apr/20

Status: Done
Project: DRP 2-D Pipeline
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: ncaplar Assignee: ncaplar
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File Comparison_of_exposure_times.png    
Issue Links:
Blocks
blocks INSTRM-933 Migrate LAM spsAitCommands to the Sub... Done
blocks INSTRM-946 migrate defocus command from spsait t... Done
Relates
relates to PIPE2D-324 Estimate the exposure times for the d... Done
Story Points: 4
Sprint: 2DDRP-2021 A

 Description   

Before we start with full data acquisition on the Subaru data system, we need to be able to find baseline values for the optimal exposure time in order to get the best signal to noise for large amounts of spots without saturating the detector. This is basically the rehash of PIPE2D-324 for the ``new'' system at Subaru.

The notebook code is at https://github.com/Subaru-PFS/dev_2ddrp/blob/master/2d_PSF_code/Code_Repository/Other_Notebooks/Flux_Calculation_For_LAM_January_2019.ipynb. 

 

 Comments   
Comment by ncaplar [ 10/Apr/20 ]

I will start this ticket after ending PIPE2D-547 (hopefully mid next week (the week which is starting on April 13))

Comment by ncaplar [ 15/Apr/20 ]

Cliffnotes - The system at Subaru, in its current form:

1. For HgAr, flux is 0.5 of the flux that we have used at LAM, where attenuator was set at a value of 195. This means that to get equivalent exposure all times need to be extended by a factor of 2.
2. For Neon, flux is around 7.5 times higher than what we have used at LAM, where attenuator was set at a value of 243. This means that to get equivalent exposure all times need to be reduced by a factor of 7.5. Of course, that opens the old problem of the finite time for the transfer of the shutter, described in PIPE2D-422.

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