Conceptual design of the MOBIE imaging spectrograph for TMT

Bigelow, Bruce C.; Radovan, Matthew V.; Bernstein, R. A.; Onaka, Peter M.; Yamada, Haruka; Isani, Sidik; Miyazaki, Satoshi; Ozaki, Shinobu

doi:10.1117/12.2055297

Cited by 4 publications

(3 citation statements)

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“…All have a significant science emphasis on spatial resolution supported by adaptive optics (AO), but each has a wide field survey spectrograph designed to work with natural seeing or Ground Layer AO. In Figure 11(right) we present the grasp and spectral power of proposed ELT instruments DIORAMAS (EELT 64 ), MOBIE (TMT 65 ), and GMACS (GMT 66 ), compared to VIRUS and MUSE and other replicated instruments on VLTs. DIORAMAS has 4 replicated channels and GMACS is plotted for a four-spectrograph instrument that strains budgets.…”

Section: The Virus Futurementioning

confidence: 99%

VIRUS: production and deployment of a massively replicated fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

et al. 2014

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The Visible Integral-field Replicable Unit Spectrograph (VIRUS) consists of a baseline build of 150 identical spectrographs (arrayed as 75 unit pairs) fed by 33,600 fibers, each 1.5 arcsec diameter, at the focus of the upgraded 10 m Hobby-Eberly Telescope (HET). VIRUS has a fixed bandpass of 350-550 nm and resolving power R~700. VIRUS is the first example of industrial-scale replication applied to optical astronomy and is capable of surveying large areas of sky, spectrally. The VIRUS concept offers significant savings of engineering effort, cost, and schedule when compared to traditional instruments.

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Section: The Virus Futurementioning

confidence: 99%

VIRUS: production and deployment of a massively replicated fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

et al. 2014

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“…1 Corresponding instruments require huge optics, imposing technical challenges in manufacturing and supporting them. A specific example is the wide-field optical spectrograph (WFOS), [2][3][4][5] one of the TMT first-light instruments. It is being developed by an international collaboration led by the University of California Observatories.…”

Section: Introductionmentioning

confidence: 99%

Design study of an image slicer module for a multiobject spectrograph

Ozaki

2019

J. Astron. Telesc. Instrum. Syst.

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We investigate an image slicer module for an optical multiobject spectrograph, wide-field optical spectrograph (WFOS), which is one of the first-light instruments of the Thirty Meter Telescope (TMT). The image slicer divides the target image into three slices, thus providing a one-third narrower slit width. By positioning a suite of such modules at the telescope focal surface, multiobject spectroscopy with high spectral resolution can be achieved. Three optical designs are developed: a two-mirror design, a four-mirror design, and a flat-mirror design. Comparing them, the flat-mirror design is found to be the most preferable for WFOS. From a tolerance analysis, the tolerances of manufacturing and assembling appear challenging but not insurmountable. We describe how the steep field curvature of TMT requires at least nine module variants, tuned to reduce defocus in specific focal surface zones. Finally, we introduce a viable mechanical packaging concept.

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“…Wide-Field Optical Spectrograph (WFOS) [1,2,3] is one of the first-light instruments of Thirty Meter Telescope (TMT), and has been developed in an international collaboration led by University of California Observatories. Its spectral resolving powers (R) are ~5,000 and ~1,000 in the high dispersion mode and the low dispersion mode, respectively.…”

Section: Introductionmentioning

confidence: 99%