Review of UseCases and Level-B requirements for the Optical Throughput
Summary
This is review of current state of the art situation around Level-B requirements and UseCases regarding Optical Throughput calibration.
From my perspective of view, B-DPPS-2310 and B-DPPS-2335 refers to the same problem of optical throughput computation, but one refers only to accuracy of 5% and other to the Category-B analysis, but overall they intersect each other. Why in B-DPPS-2310 in Explanatory Notes mentioned that optical throughput is derived from muon images, if there are individual requirement (B-DPPS-2330) for muon image. Maybe better to delete this note about muon image, and merge B-DPPS-2310 and B-DPPS-2335 to one General Lebel-B req about optical throughput.
B-DPPS-2330 refers to the computation of optical throughput through the muon ring analysis. Maybe will be good to have one general Level-B requirement that states main necessary parameters of optical throughput (frequency, accuracy, etc) and then appropriate Level-B req for every method of optical throughput calibration.
Level-B requirement | UseCase |
---|---|
B-DPPS-2310 Optical Throughput Calibration: The DPPS shall be able to appropriately compensate for changes in optical throughput of up to 5% at the individual telescope and sub-array level with respect to current simulation models. - Category: Functional - Explanatory Notes: Throughput is derived from muon images. Corrections are applied during simulations and/or data processsing. Additional array-illuminator based data will be used for cross-checks. |
UC-DPPS-CP-210,UC-DPPS-CP-211,UC-DPPS-CP-212 all this UC refers to the same problem, except of UC-DPPS-213, because this one method has accuracy 4-7%, and not <5% as stated in requirement |
B-DPPS-2320 Muon Parameters Calculation: The DPPS shall extract muon image parameters necessary for optical throughput determination from candidate muon event images in all telescopes. _- Category:_ Functional - Explanatory Notes: Since there are multiple parameters, depending on the actual algorithm employed, the full list of parameters isn't shown here. |
Moved it to the Level-C requirement (C-2310-1, C-2330-1) |
B-DPPS-2330 Optical Throughput The DPPS shall derive, from muon image parameters, corrections of the optical throughput to better than 5% rms. - Category: Functional |
This looks like child requirement to B-DPPS-2310 Use Case UC-DPPS-CP-211: Optical throughput via muon rings analysis |
B-DPPS-2235 Optical Throughput Computation The DPPS shall compute optical throughput corrections in the Category-B analysis. -Category: Functional |
Looks like all this UC satisfy this requirement UC-DPPS-CP-210, UC-DPPS-CP-211, UC-DPPS-CP-212, UC-DPPS-CP-213 As far as optical throughput calibration will be performed in the category B analysis |
B-DPPS-3620 Use of Cherenkov Images for Calibration The DPPS shall be able to extract calibration parameters from the analysis of gamma-like Cherenkov images. -Category: Functional |
UC-DPPS-CP-210 Compute absolute optical throughput (as parent UC for all optical throughput) UC-DPPS-CP-212: Optical throughput calibration using reconstructed shower energies |
Appropriate Level-B requirement is under review But this UC can be assigned to any Level-B requirement that states optical thoughput calibration without particular methods. In Paper (Stefanik, S. et al., 2019, APh, 109, 12) concluded about achievable 4-7% accurasy for CTC method |
Use Case UC-DPPS-CP-213: Telescopes inter-calibration with Cherenkov Transparency Coefficient |
Comments and questions for UseCases
- No UseCase and Requirement for "ground-based illumination" and "lasers crossing the array" algorithms
- In US-210, 212,213 logs and errors are redirecting to TOSS, in US-211 it is directed to WMS (Need to change it and add TOSS to actors?)
- Should UC-212 be intended for cat-B data (not cat-C as in description), as part of complementary methods for calibrating? And why using DL-3 data (maybe because only in DL-3 data we already know parameters of shower, which we need for this method?)