Coronagraphy (conclusion). NIRSpec architecture. MSA. IFS concept

30 Março 2026, 14:00 • José Manuel Rebordão

Coronagraphy: inner and outer working angles and their main dependences. The Roman coronagraphs approach.
NIRSpec: system basics. FoV. Optical design, different pupil and image planes. Filter and dispersion wheels. Micro-shutter Array (MSA) technology.Fixed slits.
Integral Field Spectroscopy (IFS) approach and IFU architectures
 
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NIRSpec IFU. MIRI-MSR IFU. NIRISS.

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Coronagraphy in NIRCam and MIRIM. MIRIM.

27 Março 2026, 09:00 • José Manuel Rebordão

NIRCam and MIRIM coronagraphy: Lyot architecture. Coronagraphic (occultors and Lyot stops) masks and their “half-tone” implementation. MIRI: coronography, 4QPM masks: Examples.
 
MIRI - architecture and optics elements, excluding MRS: FoV, observation modes, spectral elements, calibration, low resolution spectroscopic modes, prism. #D model of MIRIM and MSR.
 
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NIRSpec. IFU.

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NIRCam: general

23 Março 2026, 14:00 • José Manuel Rebordão

FGS – some details on the fcuntion of the TMA between finite conjugates, and to the focusing pair of mirrors.
NIRCam: Architecture of the instrument. Optical architecture and their main elements. Lenses, materials. Integration of the coronograph in terms of mask placement and FoV. Beam-splitter. Reference sources (for flat field and for image quality) and their implementation. Description and analysis of the the filters in the filter and pupil wheels.
The Weak Lenses.
General overview of the Slitness mode (WFSS) and of Time series observations (TSO).
 
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Grisms. Coronagraphy

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OTE. FGS

20 Março 2026, 09:00 • José Manuel Rebordão

OTE: TMA architecture. Flat FoV and its partition with POM’s. Pods. WFE maps, Strehl ratio. Examples.
The Fine Steering Mirror and the real image of the PM. Sequence of real images of the mirrors.
FGS and its heritage. Redundancy. SEU concept. Engineering subsystems and criticality.
FGS architecture, functions and its operational modes. Subarrays.
 
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NIRCam

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Reference Systems. JWST OTE elements

16 Março 2026, 14:00 • José Manuel Rebordão

Matrice rotations. Euler angles and different conventions. Quaternions, properties. Relations between rotation matrices Euler angles and quaternions. Example: PLATO reference systems.
 
JWST: OTE and ISIM. Overview ISIM instruments and of spectroscopic capabilities of JWST. OTE: conics; TMA and Korsch type telescopes; FoV and image plane.
 
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Mirrors and WFE. FGS. NIRCam

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