The VLT‐VIRMOS Mask Manufacturing Unit
- 1 April 2001
- journal article
- research article
- Published by IOP Publishing in Publications of the Astronomical Society of the Pacific
- Vol. 113 (782) , 452-462
- https://doi.org/10.1086/319548
Abstract
The VIRMOS Consortium had the task to design and manufacture two spectrographs for the ESO Very Large Telescope, VIMOS (Visible Multi‐Object Spectrograph) and NIRMOS (Near Infrared Multi‐Object Spectrograph). This paper describes how the mask manufacturing unit (MMU), which cuts the slit masks to be used with both instruments, meets the scientific requirements and manages the storage and the insertion of the masks into the instrument. The components and the software of the two main parts of the MMU, the mask manufacturing machine and the mask handling system, are illustrated together with the mask material and with the slit properties. Slit positioning is accurate within 15 μm, equivalent to 003 on the sky, while the slit edge roughness has an rms on the order of 0.03 pixels on scales of a slit 5'' long and of 0.01 pixels on the pixel scale (0205). The MMU was successfully installed during 2000 July/August at the Paranal Observatory and is now operational for spectroscopic mask cutting, in compliance with the requested specifications.Keywords
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This publication has 6 references indexed in Scilit:
- VIMOS and NIRMOS multi-object spectrographs for the ESO VLTPublished by SPIE-Intl Soc Optical Eng ,2000
- Masking techniques at the focal plane of the FORS instrumentsPublished by SPIE-Intl Soc Optical Eng ,2000
- VIRMOS: visible and infrared multiobject spectrographs for the VLTPublished by SPIE-Intl Soc Optical Eng ,1998
- Fabrication of narrow-slit masks for the Gemini Multiobject SpectrographPublished by SPIE-Intl Soc Optical Eng ,1997
- The Keck Low-Resolution Imaging SpectrometerPublications of the Astronomical Society of the Pacific, 1995
- 2-D mask generation by YAG laser for multiobject spectroscopy at CFHT: LAMAPublished by SPIE-Intl Soc Optical Eng ,1990