Ultraviolet spectrometer and polarimeter for the Solar Maximum Mission

M. S. Miller; A. J. Caruso; B. E. Woodgate; A. A. Sterk

doi:10.1364/AO.20.003805

Applied Optics
Vol. 20,
Issue 21,
pp. 3805-3814
(1981)
•https://doi.org/10.1364/AO.20.003805

Ultraviolet spectrometer and polarimeter for the Solar Maximum Mission

M. S. Miller, A. J. Caruso, B. E. Woodgate, and A. A. Sterk

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M. S. Miller, A. J. Caruso, B. E. Woodgate, and A. A. Sterk, "Ultraviolet spectrometer and polarimeter for the Solar Maximum Mission," Appl. Opt. 20, 3805-3814 (1981)

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Abstract

The detailed optical design of the Solar Maximum Mission–Ultraviolet Spectrometer and Polarimeter is discussed in conjunction with the scientific objectives that led to the design. The instrument consists of a 1.8-m effective focal length aplanatic Gregorian telescope followed by a 1-m Ebert spectrometer. The design of the Stokes polarimeter is also discussed.

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Telescope effective focal length	1.8 m
Telescope collecting area	66.4 cm²
Secondary magnification	6.0
Field-of-view	256 × 256 arcsec²
Entrance slit sizes	1 × 1, 3 × 3, 10 × 10, 30 × 30, 1 × 10, 4 × 4, 15 × 286, 1 × 180 arcsec²
Minimum raster step	1 arcsec
Ebert mirror focal length	1 m
Grating frequency	3600 gr/mm
Spectral range	1150–1800-Å second order; 1750–3600-Å first order
Spectral resolution	0.02-Å FWHM second order, 0.04-Å FWHM first order
Exit slit widths	0.01, 0.03, 0.05, 0.2, 0.3, 0.5, 0.6, 0.8, 2.3, 3.0 Å
System efficiency at 1215 Å (without polarimeter)	0.004

Source angle (sec)	Secondary mirror		80% width image growth

	Displacement (sec)	About	Along scan (arcsec)	Cross scan (arcsec)
169.68	869	Common focal point	0.2	0.1
169.68	468	40 mm to sunward side of common focal point	1.6	1.3
169.68	398	60 mm to sunward side of common focal point	1.8	1.5
169.68	366	Secondary mirror vertex	2.0	1.6
169.68	338	10 mm to sunward side of secondary mirror vertex	2.1	1.7

Source angle (see)	Secondary mirror		80% width image growth

	Displacement (sec)	About	Along scan (arcsec)	Cross scan (arcsec)
169.68	852	Common focal point	3.9	3.1
169.68	480	40 mm to secondary side of common focal point	1.0	0.8
169.68	394	60 mm to secondary side of common focal point	0.3	0.3
169.68	362	Secondary mirror vertex	0.1	0.1
169.68	335	10 mm to sunward side of secondary mirror vertex	0.2	0.2

SLIT SET		ENTRANCE SLIT SIZE ARC SEC	TYPE OF SLIT SET		G TUBES 2ND ORDER												F TUBE 1ST ORDER

					DETECTOR 1			DETECTOR 2			DETECTOR 3			DETECTOR 4			DET. 5

LETTER CODE	POSITION NUMBER				WAVELENGTH ION		EXIT SLIT WIDTH	WAVELENGTH ION		EXIT SLIT WIDTH	WAVELENGTH ION		EXIT SLIT WIDTH	WAVELENGTH ION		EXIT SLIT WIDTH	EXIT SLIT WIDTH

A	11	1 × 1	Velocity			1215.67 + 0.5	0.03		1215.67 − 0.5	0.03		1238.82 − 0.17	0.03		1238.82 + 0.17	0.03	-
B	12	3 × 3	Velocity			H I	0.03		H I	0.03		N V	0.03		N V	0.03	0.03
C	15	10 × 10	Velocity			1215.67 + 0.15	0.3		1215.67 − 0.15	0.3		1238.82 − 0.15	0.3		1238.82 + 0.15	0.3	-
C	15	10 × 10	Velocity			H I	0.3		H I	0.3		N V	0.3		N V	0.3	-
D	5	10 × 10	Velocity			1335.71 − 0.15	0.3		1335.71 + 0.15	0.3		1349.38 − 0.15	0.3		1349.38 + 0.15	0.3	-
E	6	30 × 30	Velocity			C II	0.3		C II	0.3		Fe XII	0.3		Fe XII	0.3	-
F	13	10 × 10	Velocity			1393.76 − 0.15	0.3		1393.76 + 0.15	0.3		1402.78 − 0.15	0.3		1402.78 + 0.15	0.3	-
G	14	30 × 30	Velocity			Si IV	0.3		Si IV	0.3		Si IV	0.3		Si IV	0.3	-
H	7	10 × 10	Velocity			1354.1 + 0.15	0.3		1354.1 − 0.15	0.3		1371.29 − 0.15	0.3		1371.29 + 0.15	0.3	-
I	8	30 × 30	Velocity			Fe XXI	0.3		Fe XXI	0.3		O V	0.3		O V	0.3	-
J	16	10 × 10	Velocity			1349.38 − 0.15	0.3		1349.38 + 0.15	0.3		1354.1 − 0.15	0.3		1354.1 + 0.15	0.3	-
K	17	30 × 30	Velocity			Fe XII	0.3		Fe XII	0.3		Fe XXI	0.3		Fe XXI	0.3	-
L	3	10 × 10	Velocity			1533.43 + 0.15	0.3		1533.43 − 0.15	0.3		1548.19 − 0.15	0.3		1548.19 + 0.15	0.3	-
M	4	3 × 3	Velocity			Si II	0.3		Si II	0.3		C IV	0.3		C IV	0.3	-
N	18	10 × 10	Intensity			1349.38	0.3		1358.50	0.3		1371.29	0.5		1354.1	3.0	-
O	19	3 × 3	Intensity			Fe XII	0.3		O I	0.3		O V	0.5		Fe XXI	3.0	-
P	1	10 × 10	Intensity			1548.19	2.3		1558.69	0.3		1561.34	0.5		1550.79	2.3	-
Q	2	1 × 1	Intensity			C IV	2.3		Fe II	0.3		C I	0.5		C IV	2.3	-
R	9	1 × 10		Intensity,		1402.77	0.05		1406.00	0.05	*		0.01		1401.16	0.05	0.01
S	10	4 × 4		Spectroscopy		Si IV	0.05		S IV	0.05	*		0.01		O I	0.05	-
T	21	15 × 286	Lyman-α Corona		1215.67 − 0.4		0.2	*		0.17	*		0.17	1215.67 + 0.4		0.2	-
U	22	15 × 286	Lyman-α Corona		1215.67 − 0.5		0.8	-		-	-		-	1215.67 + 0.5		0.8	-
V	20	1 × 180		Spectroscopy,	*		0.01	*		0.01	*		0.01	-		-	0.01
V	20	1 × 180		Aeronomy	*		0.01	*		0.01	*		0.01	-		-	0.01

Telescope effective focal length	1.8 m
Telescope collecting area	66.4 cm²
Secondary magnification	6.0
Field-of-view	256 × 256 arcsec²
Entrance slit sizes	1 × 1, 3 × 3, 10 × 10, 30 × 30, 1 × 10, 4 × 4, 15 × 286, 1 × 180 arcsec²
Minimum raster step	1 arcsec
Ebert mirror focal length	1 m
Grating frequency	3600 gr/mm
Spectral range	1150–1800-Å second order; 1750–3600-Å first order
Spectral resolution	0.02-Å FWHM second order, 0.04-Å FWHM first order
Exit slit widths	0.01, 0.03, 0.05, 0.2, 0.3, 0.5, 0.6, 0.8, 2.3, 3.0 Å
System efficiency at 1215 Å (without polarimeter)	0.004

Abstract

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Figures (10)

Tables (4)

Equations (23)

Applied Optics