24 September 2012 A fibre positioner solution for the 4MOST instrument
Author Affiliations +
Abstract
4MOST1 is a multi object spectrograph facility for ESO’s NTT or VISTA telescope. 4MOST is one of the two projects selected for a conceptual design study by ESO. The 4MOST instrument will be able to position < 1500 fibres in the focal plane and collect spectra in a high resolution (R=20000)2 and a low resolution (R=5000) mode (HRM, LRM). The spectral coverage for the LRM is 400-900 nm, the HRM covers 390-459 nm and 564-676 nm. We will present one of the possible positioner designs and first tests of some components for the focal plane array. The design follows the LAMOST3 positioner and has two rotational axes to move the fibre inside the patrol disc. Each axis consists of a stepper motor attached to micro harmonic drive (MHD). The small outer dimensions and high gear ratios of the MHD-stepper motor package, makes them perfectly suitable for our application. The MHD is also backlash free and self-locking what gives us the opportunity to minimize power consumption and heat dissipation during observation without loosing the position of the fibre on sky. The control electronics will also be miniaturized and part of the positioner unit.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Florian Lang-Bardl, Florian Lang-Bardl, Ralf Bender, Ralf Bender, Frank Grupp, Frank Grupp, Marco Häuser, Marco Häuser, Hans-Joachim Hess, Hans-Joachim Hess, Veronika Junk, Veronika Junk, Ralf Kosyra, Ralf Kosyra, Bernard Muschielok, Bernard Muschielok, Josef Richter, Josef Richter, Jörg Schlichter, Jörg Schlichter, Christoph Schwab, Christoph Schwab, } "A fibre positioner solution for the 4MOST instrument", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844661 (24 September 2012); doi: 10.1117/12.925969; https://doi.org/10.1117/12.925969
PROCEEDINGS
7 PAGES


SHARE
RELATED CONTENT

Introduction of Chinese SONG Telescope
Proceedings of SPIE (September 16 2012)
The wide field upgrade for the Hobby-Eberly Telescope
Proceedings of SPIE (June 22 2006)
Conceptual design for a second generation space telescope
Proceedings of SPIE (October 31 1993)
An adjustable slit mechanism for a fiber fed multi object...
Proceedings of SPIE (September 23 2012)

Back to Top