Accession Number:

ADA461544

Title:

Fast Computation of the Narcissus Reflection Coefficient for the Herschel Far-Infrared/Submillimeter-Wave Cassegrain Telescope

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2005-10-01

Pagination or Media Count:

10.0

Abstract:

Placement of a scatter cone at the center of the secondary of a Cassegrain telescope greatly reduces Narcissus reflection. To calculate the remaining Narcissus reflection, a time-consuming physical optics code such as GRASP8 is often used to model the effects of reflection and diffraction. Fortunately, the Cassegrain geometry is sufficiently simple that a combination of theoretical analysis and Fourier propagation can yield rapid, accurate results at submillimeter wavelengths. We compare these results with those from GRASP8 for the heterodyne instrument for the far-infrared on the Herschel Space Observatory and confirm the effectiveness of the chosen scatter cone design.

Subject Categories:

  • Astronomy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE