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JWST Detector Integrations Nomenclature & Readouts

Explore the comprehensive nomenclature and terminology for JWST's MULTIACCUM detector integrations. Learn about the common lexicon of terms for detector readouts, units of a .fits file, integration groups, exposure times, and data cubes. The JWST MULTIACCUM Detector Integrations involve averaged groups of nf sent to SSR, with integration time as ngroup x tgroup, and exposure time as nint x tint. Instruments feature pre-defined detector readout patterns, such as combinations of nframes and group gaps. Users do not define new readout patterns. Each instrument has specific detector readout patterns: TFI (TFIRAPID/TFI), NIRSpec (NRSRAPID/NRS/NRSSlow), MIRI (FASTMode-Short/Long, SLOWMode), and NIRCam with 9 readout patterns (Rapid/Fast with no dropped frames). User-delivered exposure times are quantized in units of the detector read group time.

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JWST Detector Integrations Nomenclature & Readouts

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  1. Nomenclature for JWST MULTIACCUM Detector IntegrationsTable 5-2 from MOCD: Common Lexicon of Terms for Detector Readouts Unit of a .fits file

  2. Nomenclature for JWST MULTIACCUM Detector Integrations Group gap Averaged groups of nf are sent to SSR Integration time = ngroup x tgroup Exposure time = nint x tint Data cube (x, y, t)

  3. JWST MULTIACCUM Detector Integrations • Instruments teams have pre-defined detector readout patterns (e.g., combinations of nframes, group gaps are set - users will never define new readout patterns) • Instruments have set detector readout patterns: • TFI: TFIRAPID / TFI • NIRSpec: NRSRAPID / NRS / NRSSlow • MIRI: FASTMode-Short/Long, SLOWMode • NIRCam - 9 readout patterns (Rapid/Fast = no dropped frames, tframe=tgroup = MAX data volume) • User Delivered exposure times will be quantized in units of the detector read group time

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