The deterministic optical alignment of the HERMES spectrograph

Gers, Luke; Staszak, Nicholas F.

doi:10.1117/12.2055574

“…Thanks to in-built opto-mechanical fiducials and a meticulous alignment plan, 11 the spectrograph was assembled and aligned at Gemini North in under two weeks (see Fig. 5).…”

Section: Spectrographmentioning

confidence: 99%

On-sky commissioning of MAROON-X: a new precision radial velocity spectrograph for Gemini North

Seifahrt

¹

,

Bean

²

,

Stürmer

³

et al. 2020

Ground-Based and Airborne Instrumentation for Astronomy VIII

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MAROON-X is a fiber-fed, red-optical, high precision radial velocity spectrograph recently commissioned at the Gemini North telescope on Mauna Kea, Hawai'i. With a resolving power of 85,000 and a wavelength coverage of 500-920 nm, it delivers radial velocity measurements for late K and M dwarfs with sub-50 cm s −1 precision. MAROON-X is currently the only optical EPRV spectrograph on a 8 m-class telescope in the northern hemisphere and the only EPRV instrument on a large telescope with full access by the entire US community. We report here on the results of the commissioning campaign in December 2019 and early science results.

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“…The collimator alignment process was now able to commence with the HERMES collimator mirror first being set to the established optical axis [20]. The collimator mirror was tested interferometrically in the assembled condition to ensure no stress was being transferred to the surface and it was still meeting wavefront requirement.…”

Section: Assembly and Integrationmentioning

confidence: 99%

“…With the cameras mounted, the 1 meter-diameter HERMES collimator mirror was reassembled into its mount and then reset onto the structure. All the most massive HERMES components were now set to the frame, fully loading the structure, with the exception of the IR channel structure and camera, which was left until later in the assembly to allow alignment access to the collimator down the center of the spine The collimator alignment process was now able to commence with the HERMES collimator mirror first being set to the established optical axis [20]. The collimator mirror was tested interferometrically in the assembled condition to ensure no stress was being transferred to the surface and it was still meeting wavefront requirement.…”

Section: Assembly and Integrationmentioning

confidence: 99%

First light results from the HERMES spectrograph at the AAT

Sheinis¹,

Anguiano²,

Asplund³

et al. 2016

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The High Efficiency and Resolution Multi Element Spectrograph, HERMES is an facility-class optical spectrograph for the AAT. It is designed primarily for Galactic Archeology [21], the first major attempt to create a detailed understanding of galaxy formation and evolution by studying the history of our own galaxy, the Milky Way. The goal of the GALAH survey is to reconstruct the mass assembly history of the of the Milky Way, through a detailed spatially tagged abundance study of one million stars. The spectrograph is based at the Anglo Australian Telescope (AAT) and is fed by the existing 2dF robotic fiber positioning system. The spectrograph uses VPH-gratings to achieve a spectral resolving power of 28,000 in standard mode and also provides a high-resolution mode ranging between 40,000 to 50,000 using a slit mask. The GALAH survey requires a SNR greater than 100 for a star brightness of V=14. The total spectral coverage of the four channels is about 100nm between 370 and 1000nm for up to 392 simultaneous targets within the 2 degree field of view. Hermes has been commissioned over 3 runs, during bright time in October, November and December 2013, in parallel with the beginning of the GALAH Pilot survey starting in November 2013. In this paper we present the first-light results from the commissioning run and the beginning of the GALAH Survey, including performance results such as throughput and resolution, as well as instrument reliability. We compare the abundance calculations from the pilot survey to those in the literature.

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“…With the cameras mounted, the 1 meter-diameter HERMES collimator mirror was reassembled into its mount and then reset onto the structure. All the most massive HERMES components were now set to the frame, fully loading the structure, with the exception of the IR channel structure and camera, which was left until later in the assembly to allow alignment access of the collimator down the center of the spine The collimator alignment process was now able to commence with the HERMES collimator mirror first being set to the established optical axis [20]. The collimator mirror was tested interometrically in the assembled condition to ensure no stress was being transferred to the surface and it was still meeting wavefront requirement.…”

Section: Assembly and Integrationmentioning

confidence: 99%

First light results from the Hermes spectrograph at the AAT

Sheinis

¹

,

Barden

²

,

Birchall

³

et al. 2014

Self Cite

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The High Efficiency and Resolution Multi Element Spectrograph, HERMES is an facility-class optical spectrograph for the AAT. It is designed primarily for Galactic Archeology [21], the first major attempt to create a detailed understanding of galaxy formation and evolution by studying the history of our own galaxy, the Milky Way. The goal of the GALAH survey is to reconstruct the mass assembly history of the of the Milky Way, through a detailed spatially tagged abundance study of one million stars. The spectrograph is based at the Anglo Australian Telescope (AAT) and is fed by the existing 2dF robotic fiber positioning system. The spectrograph uses VPH-gratings to achieve a spectral resolving power of 28,000 in standard mode and also provides a high-resolution mode ranging between 40,000 to 50,000 using a slit mask. The GALAH survey requires a SNR greater than 100 for a star brightness of V=14. The total spectral coverage of the four channels is about 100nm between 370 and 1000nm for up to 392 simultaneous targets within the 2 degree field of view. Hermes has been commissioned over 3 runs, during bright time in October, November and December 2013, in parallel with the beginning of the GALAH Pilot survey starting in November 2013. In this paper we present the first-light results from the commissioning run and the beginning of the GALAH Survey, including performance results such as throughput and resolution, as well as instrument reliability. We compare the abundance calculations from the pilot survey to those in the literature.

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The deterministic optical alignment of the HERMES spectrograph

Cited by 5 publications

References 1 publication

On-sky commissioning of MAROON-X: a new precision radial velocity spectrograph for Gemini North

On-sky commissioning of MAROON-X: a new precision radial velocity spectrograph for Gemini North

First light results from the HERMES spectrograph at the AAT

First light results from the Hermes spectrograph at the AAT

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