[INSTRM-1418] Add `getSunssPfsConfig(ra, dec, pa)` function Created: 23/Oct/21 Updated: 13/Jul/22 |
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| Status: | Open |
| Project: | Instrument control development |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Task | Priority: | Normal |
| Reporter: | cloomis | Assignee: | Unassigned |
| Resolution: | Unresolved | Votes: | 0 |
| Labels: | SPS, SuNSS | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Description |
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Return a `pfsConfig` for all SUNSS_IMAGING and SUNSS_DIFFUSE fibers. Use the provided (ra, dec, pa) pointing to generate approximate ra, dec for the fibers. If none provided, set all ra/dec to NaN. In any case, set all pfi positions to NaN. ra/dec/pa might be fuzzed to avoid information leakage, but that would be done by the ICC caller. |
| Comments |
| Comment by cloomis [ 23/Dec/21 ] |
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More specifically, we need a (pfs_utils?) library function which returns a pfsConfig given (ra, dec, pa), where (ra, dec) is the telescope pointing and pa is the SuNSS rotator angle w.r.t. the sky. We will need a second routine to calculate that pa, since SuNSS has a peculiar physical rotation. But we do have the angle of SuNSS relative to the telescope calibrated, right? yuki.moritani? |
| Comment by yuki.moritani [ 23/Dec/21 ] |
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Well, I think Jim's document (page 8 of AligningSunssV4.pdf) answers the question? |
| Comment by cloomis [ 23/Dec/21 ] |
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Thanks for the pointer. So the x-y shift using the set screws has been applied? In which case the telescope boresight falls on the center fiber, and from there N is 4.1 degrees East of fiber 1 (6.7deg from the truss angle minus the 2.6deg measured calibration for the ferrule seating, etc.). Right? With 7 fibers along the 60deg edge that seems a good match with the figure... |
| Comment by yuki.moritani [ 23/Dec/21 ] |
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Yes, one adjustment was applied, and we checked the adjustment. https://pfs.ipmu.jp/internal/SlackArchive/Full/commissioning.html (See a few conversations from "rhl Sat 2021-04-03 01:58PM") We were almost there. Further analysis is needed if we apply the second alignment. Yes.. 4.1 degree sounds correct.
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