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Instrumentation -- Technology of Prime Focus Spectrograph

The Subaru Prime Focus Spectrograph (PFS) is a spectrograph system with a fiber positioner system to be mounted at the prime focus of the Subaru telescope. The instrument allows simultaneous spectral observation of up to 2400 astronomical targets in a wide field of view of 1.3 degree diameter at a time.

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Subaru Telescope

The Subaru Telescope is an 8.2-meter telescope at the 4,200m (12,460ft.) summit of Mauna Kea, Hawaii. Thanks to its photon-collecting power and wide field-of-view, Subaru Telescope enables PFS a panoramic and efficient spectroscopic survey of faint galaxies.

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WFCWide Field Corrector(WFC)

WFC is the optical system consists of 7 lenses designed to correct imaging aberrations for Hyper Suprime-Cam(HSC). The first lens (the bottom most lens in right picture) is 820 mm (32inch) diameter wide effective area and the total lens system is 1845 mm (73inch) long.

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Spectrographs

WFCThe four-unit of spectrographs provide the sumultaneous measure of 2400 spectra. Each spectrograph has three independent channels separated by dichroics and covers a wide wavelength range from 0.38 micrometer to 1.3 micrometer.

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Fiber System

The fiber system consists of 2400 optical fibers which relay light collected through the WFC at the focal plane to four spectrographs located in a room adjacent to the telescope. Each fibers is 55 meters in length and are assembled into four groupes providing 600 inputs to each spectrograph.

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Fiber Positioner

Each optical fiber tip in an array of 2400 fibers, is controllable in-plane by the fiber positioner, nicknamed "Cobra." The patrol regions, Each 9.5mm in diameter, are packed in a hexagonal pattern with 8mm separation. The overlap between adjacent patrol regions enables 100% sky coverage of the hexagonal field.

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Movie of a prototype of Fiber Positioner "Cobra"