A spectrograph instrument concept for the Prime Focus Spectrograph (PFS) on Subaru Telescope

TL;DR

This paper presents the conceptual design of a multi-channel spectrograph system for the Subaru Telescope's Prime Focus Spectrograph, detailing optical and mechanical aspects and development phases.

Contribution

It introduces a novel opto-mechanical design for a multi-channel spectrograph tailored for the Subaru Telescope's PFS, including optical performance analysis and development planning.

Findings

Optical design achieves broad wavelength coverage from 380 nm to 1300 nm.

Mechanical design meets specified requirements for stability and integration.

Development phases outlined for instrument assembly, integration, and testing.

Abstract

We describe the conceptual design of the spectrograph opto-mechanical concept for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the SUBARU telescope. The SuMIRe PFS will consist of four identical spectrographs, each receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus. Each spectrograph will have three channels covering in total, a wavelength range from 380 nm to 1300 nm. The requirements for the instrument are summarized in Section 1. We present the optical design and the optical performance and analysis in Section 2. Section 3 introduces the mechanical design, its requirements and the proposed concepts. Finally, the AIT phases for the Spectrograph System are described in Section 5.