Mosaicked echelle grating support for the Hectochelle fiber-fed spectrograph

Peter Cheimets; Andrew H. Szentgyorgyi; Mario R. Pieri

doi:10.1117/12.316749

9 July 1998 Mosaicked echelle grating support for the Hectochelle fiber-fed spectrograph

Peter Cheimets, Andrew H. Szentgyorgyi, Mario R. Pieri

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316749
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

This paper presents the design of an assembly to support the Hectochelle multi-object spectrograph grating. The grating consists of two mosaicked, 420 mm by 320 mm by 74 mm thick, 110 line/mm echelle grating segments, nominally operated at a 72 degree angle of incidence. The fact that the grating consists of 2 segments that must be co-aligned to within 0.27 arcsecs creates a challenging design problem. After much preliminary examination, two support deigns were studied, one utilizing Invar, and the other, selected for development, using a Zerodur support structure. The trade study to select the final design is discussed. The Zerodur design was selected because it maintained higher grating stability throughout the operating temperature range than the Invar design. The Zerodur design concept is discussed in detail, including the results of finite element modeling that shows system feasibility.

Citation Download Citation

Peter Cheimets, Andrew H. Szentgyorgyi, and Mario R. Pieri "Mosaicked echelle grating support for the Hectochelle fiber-fed spectrograph", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316749

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