[PIPE2D-918] Provide flux data for calibration lamps and PFI for JEG Created: 22/Oct/21 Updated: 06/Dec/21 Due: 01/Dec/21 Resolved: 01/Dec/21 |
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| 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 | ||
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| Story Points: | 2 | ||||||||||||||||||||||||||||||||
| Sprint: | 2DDRP-2021 A12 | ||||||||||||||||||||||||||||||||
| Description |
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In the email from October 18, JEG asked me to provide him with the following data: 1. rates (electrons/sec or ADU/sec and an assumed gain at a small set of 2. The same for the line lamps; rates for an identified line or, if 3. This one may be harder. For the best (highest but not saturated) ------- Notebook at: /home/ncaplar/Pipeline_notebooks/PIPE2D-918 (flux question from JEG).ipynb |
| Comments |
| Comment by ncaplar [ 11/Nov/21 ] |
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For all of these figures and data, I have extracted data from 15 seconds exposure taken during the September run. The analysis has been done by extracting data from fiber 73. This fiber has been chosen for being on 90th percentile of brightness out of all fibers - so we are talking about one of the brightest fibers available. Note that these all results are in counts. For electron conversion, gain for the instrument is approx 1.22. 1. Requested data is specified in Continuum_red_spectrum.csv 2. bright_measured_lines_Argon_red.csv 3. Argon_red_spectrum.csv |
| Comment by ncaplar [ 11/Nov/21 ] |
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With the pipeline running on PFI data, I have revisited the question about the difference of flux between predictions and seen results ( In order to deduce the average offset between the predicted and seen flux, I have followed the following procedure: 1. Select 12 brightest lines from the table provided by Erin for the specific lamp and arm For continuum, I compare median fluxes between the predicted and seen fluxes in the area where we have data Using this procedure, I am finding median offset to be (rounded to the closest integer, which I believe is reasonable given the uncertainties): Neon, red: 3 The difference between results in red and blue is probably indicative of the same problem as discussed in The figures attached to this ticket show:
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| Comment by ncaplar [ 11/Nov/21 ] |
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I also need to compare the continuum data with a prediction from JEG, that he circulated in an email on November 8, 2021, and that differs from a prediction produced by Erin. |
| Comment by ncaplar [ 30/Nov/21 ] |
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I have talked with Erin yesterday (Nov 29). As part of that discussion I promised to close this ticket by Dec 01 by |
| Comment by ncaplar [ 01/Dec/21 ] |
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I find that the Jim prediction for continuum that he shared is around 3x times brighter than real data. This is assuming that the flux is linearly proportional to the power supplied (as his prediction is done with 100 W, and 50 W was installed). 3x factor is consistent with Jim has claimed. Erin has modified her predicted after finding an error on December 2, 2021. After that fix her prediction is around 6x too bright in red, around 11,12 times too bright in blue. I have double checked, and the results coming from the pipeline seem reasonable. Erin will write an email to Robert to inquire about further actions and plan to meet with Jim soon. |