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NIRISS Performance Verification Results - Data Quality Assessment & Warmup Meeting Summary 2014

This document provides a summary of the assessment of data quality for the SI-requested tests conducted as part of the NIRISS Performance Verification. It includes a quicklook quality assessment, identified issues, and solutions. Preliminary results for specific tests assigned to different teams are also discussed briefly. Key issues, such as low flux, integrations, and header keywords, are highlighted. Suggestions for further investigation and actions required before warm-up are addressed.

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NIRISS Performance Verification Results - Data Quality Assessment & Warmup Meeting Summary 2014

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  1. NIRISS CV2 Assessment/Resultsfor Proceed to Warmup Meeting Warmup/Optics 2014 Sep 19

  2. Assessment of data quality for SI-requested tests • Requested tests were part of the NIRISS Performance Verification (7.*) (JWST-STScI-003850: ghosts, scattered light, PSF core/wings, SOSS stability, NRM, etc…). All at best focus (consistent with CV1RR focus). All NIRISS modes verified and internal lamps. • Quicklook quality assessment of all the data – some repeats for low/high counts, saturation, etc…. • Issues: • PR 297/PFR 144: Glint seen on GR150R 0th-order - potential delamination. Solution: physical inspection for confirmation. No need for more data. • PR 335: small OSIM subpixel dithers not achieved (< 0.25 pix). • Solution: one axis has a larger dither, revised test with larger dithers • 3. Low flux in first TUNG4 exposure of a series (e.g. 18019): lamp warmup… • CONCLUSION: data quality is sufficient or “good enough” Warmup/Optics 2014 Sep 19

  3. 7.10.1 Ghosts (WFSS; GR150C/R) GR150R: bright source, glint on 0th order GR150C: bright source (no glint)

  4. Preliminary results for SI-requested tests, to best effort only (very brief) • In progress • Analysis of specific tests assigned to STScI and UdeM teams (also ComDev analysis and slide packages) • Upcoming technical reports in SOCCER and NGIN Warmup/Optics 2014 Sep 19

  5. Preliminary results or checks on the analysis of the ISIM-level tests, to best effort only (very brief) • Quicklook of OSS, CPT1, Initial Optical Baseline, OSIM+SI Checkout, • CPT2, etc… for NIRISS • Issues: • Scrambled integrations and header keywords (see misc PRs) • CPT1: many bad data, bad headers, missing frames, etc… • Unusual features when NIRISS in parallel: noise, high counts, and horizontal bands in darks and internal flats (e.g., 0.3.5.1.1a, 0.3.5.2.1a, 0.3.5.2.2, 0.3.8.9.2, …). Warmup/Optics 2014 Sep 19

  6. Dark Flat Warmup/Optics 2014 Sep 19

  7. Open PR summary - List of any additional tests or actions required before warm-up • Request further investigation of PR 273“NIRISS and Guider are showing abnormal • behaviourin OSIM+SI checkout test for Output 4. Hot pixels are showing a trail (approx. 10% • of flux) to the right in output 4.” • Success in reproducing the problem in OTP211NR273 (similar for G1 and • G2). • Request Rev A with variations to subarray size, NINTs, and location(and • temperature sensitivity). • OTPs written and in official timeline: Rev A (total of ~1.5 hours for NIS, G1, • and G2) • Note: just backgrounds – no OSIM sources and no mechanism • movements. Easy to schedule. Warmup/Optics 2014 Sep 19

  8. PR 273 Cutout of full-frame amp 4 region (NIRISS) Before subarray After subarray Warmup/Optics 2014 Sep 19

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