The Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer for JWST Martyn Wells MIRI EC &...
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Transcript of The Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer for JWST Martyn Wells MIRI EC &...
![Page 1: The Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer for JWST Martyn Wells MIRI EC & UKATC.](https://reader030.fdocuments.us/reader030/viewer/2022013122/56649e745503460f94b74f9d/html5/thumbnails/1.jpg)
The Mid-Infrared Instrument (MIRI)
Medium Resolution Spectrometer for JWST
Martyn WellsMIRI EC & UKATC
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Carbon Fibre Hexapod (Denmark)
Spectrometer Main OpticsNetherlands
Imager (France)
Input Optics and Calibration Unit
(Belgium)
Deck (Leicester)
Spectrometer Focal Plane
Module (USA)
Spectrometer Pre Optics
UKATC
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Summary description
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Spectrometer block diagram
IFU 1
IFU 2
IFU 3
IFU 4
Collimator
Collimator
Collimator
Collimator
Camera 1
Camera 2
FPA 1
FPA 2
Grating
Grating
Grating
Grating
Dichroic 1
Dichroic 2
Dichroic 3
SPO SMO
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Spectrometer fov
-4
-3
-2
-1
0
1
2
3
4
-4 -2 0 2 4Field of view across slices (arcsec)
Fie
ld o
f vie
w a
lon
g s
lices (
arc
sec)
IFU 1
IFU 2
IFU 3
IFU 4
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Dichroic passbands
1
1. 2
1. 4
0 5
10 15 20 25 30
Channel 1A Channel 1B Channel 1C
Channel 2A Channel 2B Channel 2C
Channel 3A Channel 3B Channel 3C
Channel 4A Channel 4B Channel 4C
Exposure A
Exposure B
Exposure C
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Spectrometer – ranges, R, sampling and fov
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WHEEL A
WHEEL B
CHANNEL 1 APO
CHANNEL 2 APO
INPUT MIRROR
Blocking filter
Light trap
Fold mirror
Adjustable fold mirror
CHANNEL 3 exit port
D1
D2
D3
Light trap
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Ray-trace diagram of the Channel 1 IFU
David Lee 17 February 2004
Image Slicer MirrorRe-imaging mirrors
Output slits
Location of input Pupil
IFU input fold mirror
Location of output Pupils
~150 (length varies with slice position)Slice #1 151.60 mm z offset = 2.32 mmSlice #11 149.28 mm z offset = 0.00 mm
10 31.1
22.1
41.3
Channel 1 - IFU APO exit fold mirror
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Diagram of the output slit
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Integral Field Unit Optical Layout
M1
M2M4
M3APO output fold
Image slicer mirror
Roof mirror
Re-imaging mirror array
Outputslitets
Pupilimages
INPUT Spectrometer Pre-Optics
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Here are the flattened envelopes of the sliced and stacked sky images, heading off to the spectrometer collimator mirrors in the Spectrometer Main Optics (SMO)
The position of the Channel 2 collimator mirror
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Here, the beam from the Channel 2 collimator is shown, heading back to one of Channel 2’s three diffraction gratings.
The position of a Channel 2 grating.
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The light is dispersed by the grating.
Dispersion direction
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...and heads back to a fold mirror.
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...which sends it to the final, camera mirror, which is a common optical element for Channels 1 and 2 (as is the fold mirror)
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The camera mirror forms the final image...
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...on the Focal Plane Module (FPM), shown here as the green cylinder.
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Here comes the beam from the Channel 1 IFU, collimated and sent to one of Channel 1’s 3 gratings...
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...where it is dispersed...
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...and sent via this fold mirror to share the last two mirrors on its way to the FPM with the spectrum from Channel 2.
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Channel 2a spectra
Constant wavelengthpositions
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Some manufactured components