WFOS instrument trade study: slicer vs. fiber instrument concept designs and results (Conference Presentation)

Bundy, Kevin; Savage, Maureen L.; Kupke, Renate; MacDonald, Nicholas; Westfall, Kyle B.; Radovan, Matthew V.; Cai, Zheng; DiGiorgio, Brian; Dekany, Richard; Divakar, Devika; Fucik, Jason; Ji, Huanhuan; Miyazaki, Satoshi; Ozaki, Shinobu; Phillips, Andrew C.; Roy, Namrata; Smith, Roger; Surya, Arun; Sriram, S.; Tsuzuki, Toshihiro

doi:10.1117/12.2312283

Cited by 2 publications

(3 citation statements)

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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%

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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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Section: Introductionmentioning

confidence: 99%

“…8 Facing this situation, the WFOS development team decided to study alternate concepts. 5,9 Slicer-WFOS is one of these concepts. It uses a series of image slicers to achieve higher spectral dispersion while maintaining target multiplex.…”

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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show abstract

“…To avoid these concerns, we started to study alternate concepts [4] . Japanese WFOS team is studying one of the concepts using image slicers (Slicer-WFOS) in collaboration with California Institute of Technology.…”

Section: Introductionmentioning

confidence: 99%