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Titolo:
Concepts for a large-aperture, high dynamic range telescope
Autore:
Kuhn, JR; Moretto, G; Racine, R; Roddier, F; Coulter, R;
Indirizzi:
Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA Univ Hawaii Honolulu HI USA 96822 ii, Inst Astron, Honolulu, HI 96822 USA Univ Durham, Dept Phys, Astron Instrumentat Grp, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE rumentat Grp, Durham DH1 3LE, England Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ys, Montreal, PQ H3C 3J7, Canada
Titolo Testata:
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
fascicolo: 790, volume: 113, anno: 2001,
pagine: 1486 - 1510
SICI:
0004-6280(200112)113:790<1486:CFALHD>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
OFF-AXIS; PLANETARY TELESCOPE; PERFORMANCE; SYSTEMS; DESIGN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Kuhn, JR Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA Univ Hawaii 2680 Woodlawn Dr Honolulu HI USA 96822 , HI 96822 USA
Citazione:
J.R. Kuhn et al., "Concepts for a large-aperture, high dynamic range telescope", PUB AST S P, 113(790), 2001, pp. 1486-1510

Abstract

This paper summarizes concept studies for a large telescope capable of wide-field imaging and of the highest possible dynamic range for photometry and angular resolution. Point-spread functions (PSFs) and scattered light levels at large offsets are computed and compared for four telescopes of the same light-gathering power but with different pupil functions:1. a reference monolithic mirror telescope with a 17.4 m primary,2. a segmented mirror telescope (SMT) with a hexagonally segmented primary,3. a hexagonal off-axis telescope (HOT) with a distributed aperture made of m unobstructed circular 6 x 6.5 mirrors that are identical off-axis sections of a parent 20 m mirror, and4. a square off-axis telescope (SOT) whose aperture is made of m off-axis mirrors. 4 x 8. The characteristics of the PSFs are examined in the diffraction- and seeing-limited regimes, assuming (1) perfect mirror figure and (2) realistic figure errors (edge defects). The implications of field rotation with an altitude-azimuth mounting are discussed in each case. The implementation of adaptive optics (AO) and the properties of AO-compensated PSFs having a Strehl ratio of 0.5, and of coronagraphic imaging, are also discussed for the fourconfigurations. It is shown that, in the seeing-limited regime and as intuitively expected, the optical performance of all four telescopes is comparable. With higher order adaptive optics and for coronagraphic observations, the SOT and HOT are superior to the SMT. This distinction becomes larger with relaxed constraints on mirror edge-polishing requirements. A full optical design is presented for the novel HOT configuration, and optical fabrication issues are briefly addressed. Finally, science programs and possible instrumentation layouts with the HOT are briefly explored for different modesof operation. It appears that the natural "optical bench" configuration ofthe HOT can provide a remarkably versatile and convenient environment for instrument deployment.

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Documento generato il 03/08/20 alle ore 12:49:41