New KOSMA 3-m telescope

C. Kramer; Cuno G. Degiacomi; Urs U. Graf; Richard E. Hills; M. Miller; Rudolf T. Schieder; Nicholas M. Schneider; Juergen Stutzki; Gisbert F. Winnewisser

doi:10.1117/12.317403

31 July 1998 New KOSMA 3-m telescope

C. Kramer, Cuno G. Degiacomi, Urs U. Graf, Richard E. Hills, M. Miller, Rudolf T. Schieder, Nicholas M. Schneider, Juergen Stutzki, Gisbert F. Winnewisser

Author Affiliations +

Proceedings Volume 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes; (1998) https://doi.org/10.1117/12.317403
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The Kolner Observatorium fur Submillimeter-Astronomie (KOSMA) has recently been equipped with a new 3 m submm telescope. The new telescope dish has a CFRP backstructure and aluminum panels with a mean surface accuracy of the individual panels of well below 10 micrometer. The 18 panels of the primary reflector have been adjusted to a surface rms of at present about 30 micrometer with the help of a holographic phase retrieval algorithm developed for and previously used at the JCMT. The present main beam efficiency derived from observations of Jupiter and Saturn is approximately 45% at 660 GHz. The new telescope features a chopping secondary and 2 Nasmyth ports. The excellent atmospheric transmission during winter time at the telescope site, Gornergrat near Zermatt, Switzerland, allow us flexible operation up to the highest atmospheric submm windows. We present the current status of the new telescope, in particular with regard to its surface alignment, and first astronomical results at 660 and 690 GHz.

Citation Download Citation

C. Kramer, Cuno G. Degiacomi, Urs U. Graf, Richard E. Hills, M. Miller, Rudolf T. Schieder, Nicholas M. Schneider, Juergen Stutzki, and Gisbert F. Winnewisser "New KOSMA 3-m telescope", Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); https://doi.org/10.1117/12.317403

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available