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Normal-Incidence Design Option for SolO/EUS. Roger J. Thomas NASA/GSFC 2004 November 04. NEXUS : SmEx Proposal. Required EUV spectrograph capabilities Rapid cadence (10s) Large FOV Wide temperature coverage: 20,000 K to 4 MK Doppler measurements of 1-5 km/s 1.2 arcsec spatial resolution.

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normal incidence design option for solo eus

Normal-Incidence Design Option for SolO/EUS

Roger J. Thomas

NASA/GSFC

2004 November 04

nexus smex proposal
NEXUS : SmEx Proposal
  • Required EUV spectrograph capabilities
    • Rapid cadence (10s)
    • Large FOV
    • Wide temperature coverage: 20,000 K to 4 MK
    • Doppler measurements of 1-5 km/s
    • 1.2 arcsec spatial resolution
nexus smex phase a design
NEXUS : SmEx Phase-A Design
  • Basic components of NEXUS
    • 2 element normal-incidence optical design
    • Off-axis parabolic mirror telescope f/9.3
    • Toroidal varied-line-space (TVLS) grating spectrograph with a magnification of 5.6
    • B4C / Iridium optical coatings
    • Slit (0.5 arcsec) / Slot (1 arcmin)
    • Two ICCD detectors
    • Wavelength ranges (1st order): 443-519 & 561-632 Å
    • Total optical length: 1400 mm
future design plans in response to earlier discussions
Future Design Plans (in response to earlier discussions)
  • Add a 3rd wavelength bandpass
  • Allow telescope to be slightly Hyperbolic
  • Increase FOV and spectral coverage
  • Relax spatial & spectral resolutions
  • Increase entrance-slit width
  • Reduce physical instrument dimensions
design considerations
Design Considerations
  • Magnifying spectrograph
    • RI / RO 4
    • Large plate scale in small physical length
    • Most efficient use of available volume
    • Aberrations corrected by VLS rulings on Ellipsoid
  • Thermal advantages
    • All optics see un-concentrated solar radiation
    • Primary at back: allows shielding and direct radiative cooling
    • Unwanted light can be reflected out the front
slide11

EUNIS/NEXUS TVLS Grating -- Zeiss

Measured Groove-Density Variations

slide12

EUNIS/NEXUS TVLS Grating -- Zeiss

Measured Groove-Profiles

slide13

NASA-Goddard Space Flight Center

Dr. Roger Thomas

TVLS Grating #G5 for EUNIS #3

Carl Zeiss Laser Optics GmbH

Grating Technology

Dr. Ralf Lenke

Dr. Klaus Heidemann

Date August 25, 2004

Ref. No. TG04-108 Page 2/4

Groove profile

Position [mm] Blaze angle Anti-blaze angle

y z [deg] [deg]

mean 3.4 16.2

+0.3/-0.4 +1.4/-1.3

The 1st order groove efficiency is calculated in a first approache from the averaged groove profile.

 [nm] EFFgr [%]

50.0 64.8

52.5 65.6

55.0 65.8

57.5 65.3

60.0 64.3

62.5 62.9

65.0 61.3