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Title:
Cryogenic MOS-unit for LUCIFER
Authors:
Hofmann, Reiner; Mandel, Holger; Seifert, Walter; Seltmann, Andreas; Thatte, Niranjan A.; Tomono, Daigo; Weisz, Harald
Affiliation:
AA(Max-Planck-Institut fuer Extraterrestrische (Germany)), AB(Landessternwarte Heidelberg-Koenigstuhl/Univ. Heidelberg (Germany)), AC(Landessternwarte Heidelberg-Koenigstuhl/Univ. Heidelberg (Germany)), AD(Landessternwarte Heidelberg-Koenigstuhl/Univ. Heidelberg (Germany)), AE(Max-Planck-Institut fuer extraterrestrische Physik (Germany)), AF(Max-Planck-Institut fuer extraterrestrische Physik (Germany)), AG(Ingenierbuero fuer den Maschinenbau (Germany))
Publication:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes. Edited by Iye, Masanori; Moorwood, Alan F. M. Proceedings of the SPIE, Volume 4841, pp. 1295-1305 (2003). (SPIE Homepage)
Publication Date:
03/2003
Origin:
SPIE
DOI:
10.1117/12.460892
Bibliographic Code:
2003SPIE.4841.1295H

Abstract

We present a system for the exchange and handling of cold field masks in LUCIFER, the near infrared camera and spectrograph for the LBT. Inside the LUCIFER cryostat, 10 field-stop and long-slit masks, and 23 multi-slit masks are stored in a stationary and an exchangeable cabinet respectively. With LUCIFER at operating temperature, the exchangeable cabinet with its multi-slit masks can be transferred from the LUCIFER cryostat to an auxiliary cryostat, and a second cabinet harboring the newly made, pre-cooled masks can be transferred back to LUCIFER from a second auxiliary cryostat. Inside LUCIFER, a robot transports the individual masks from their storage position in the cabinet to the focal plane and inserts them in a mask mount where they are centered on two pins. The position accuracy of the masks in the focal plane is anticipated to be better than +/- 10 μm. A mechanism which locks the masks in their cabinets and releases only the one connected to the transport robot permits mask exchange in arbitrary orientation of the cryostat.
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