ANDES, the high-resolution spectrograph for the ELT: RIZ Spectrograph preliminary design

TL;DR

This paper details the preliminary design of the RIZ spectrograph module for the ANDES instrument on the ELT, emphasizing high resolution, stability, and design inspiration from successful predecessors.

Contribution

It introduces the initial design of a high-resolution, fiber-fed spectrograph for ELT, incorporating innovative thermal and vacuum control features.

Findings

Design follows successful predecessors like HARPS and ESPRESSO.

The spectrograph is a warm, vacuum-operated, thermally controlled system.

Preliminary design status and system architecture are presented.

Abstract

We present here the preliminary design of the RIZ module, one of the visible spectrographs of the ANDES instrument 1. It is a fiber-fed high-resolution, high-stability spectrograph. Its design follows the guidelines of successful predecessors such as HARPS and ESPRESSO. In this paper we present the status of the spectrograph at the preliminary design stage. The spectrograph will be a warm, vacuum-operated, thermally controlled and fiber-fed echelle spectrograph. Following the phase A design, the huge etendue of the telescope will be reformed in the instrument with a long slit made of smaller fibers. We discuss the system design of the spectrographs system.