Plans for LSE-130 through CD-2

1. Plans for LSE-130 through CD-2 Gregory Dubois-Felsmann SLAC National Accelerator Laboratory

2. Role of the LSE-130 ISD • LSE-69 is the main Interface Control Document (ICD) between the Camera and Data Management. It depends on two subsidiary documents: • LSE-68 defines the details of the Camera data acquisition interface • LSE-130 defines details of data transfers needed by DM, other than the actual image data • LSE-69 defines categories of Camera-to-DM transfers of “support data” – for which LSE-130 will supply the lists of data items: • Design, Assembly, and Laboratory Test Data – CA-DM-CON-ICD-0001 • Camera Conditions Data (i.e., telemetry) – CA-DM-CON-ICD-0002 • Camera Configuration Data (the data used by the OCS configure command) – CA-DM-CON-ICD-0005 • The spirit of LSE-130 has been that it should define the data that DM can reasonably anticipate requiring for the pipelines and data quality assessment – and that prudent engineering requires for cross-checks on critical effects • It is desirable to have alternatives to “blind fits” to camera effects in on-sky data

3. Scope concerns • Because this definition for LSE-130 has some inherent elasticity (“prudent engineering”) there are some concerns about deriving Camera-level project scope (i.e., inputs to the CD-2 baseline) from requirements implicit in the data enumerated in LSE-130 • The nature of much of the data being discussed is that it helps DM optimize its performance on the Camera we actually receive • It is very difficult to work backward from the SRD performance requirements to unchallengeable statements that DM must have data item X with quality Y or fail – especially since we don’t know in detail yet what the actual Camera’s idiosyncrasies will be • Some judgment is required and some detailed sensor effects studies may be characterized as science-optimization work to be done under the DESC • We should try to keep these management-level decisions out of this session

4. History of LSE-130 • 2013 Joint Technical Meeting • Interactive brainstorming of a list of data needed by DM • Meant to be a “Phase 1” list – defining the types of data required but not providing quantitative specifications on precision, spatial granularity, etc. • November 2013 – June 2014 • Some refinement by DM • Review by the Camera of the meaning of each item and whether it was consistent with established scope for the Camera’s construction, documentation,and test plans • Now • Move to more quantitative definitions • Revise document structure to reflect explicit reliance on documented Camera test plans (replacing some of the previous lists of items) • Capture as input to CD-2 (note earlier Director’s Review) • Future changes with scope implications will need full CCB impact review

5. LSE-130 draft structure • Introduction • Camera to DM • Design, Assembly, and Laboratory Test Data • Component identities • Focal place electronic layout • Camera geometry • Physical sensor characteristics • Optical modeling • Thermal modeling • Documentation • Conditions Data • Configuration Data • General specifications • DM to Camera (incomplete)

6. Plans for LSE-130 • Move the full current “list of items” to a DM-level document (handle LDM-272 has been reserved) • Modify LSE-130, primarily in sections 2.1.4 and 2.1.5, to refer to existing (and upcoming) Camera test plans • E.g., Sensor Electro-optical Test Plan, LCA-10103 • Mark up LDM-272 to show the requirement/ICD/other document that confirms that each required data item will be available