The Gemini High-Resolution Optical SpecTrograph (GHOST) instrument is the next generation high resolution spectrograph for the Gemini telescope. The GHOST instrument was developed for the Gemini telescope as a collaboration between Australian Astronomical Optics (AAO) at Macquarie University, the Herzberg Astronomy and Astrophysics (HAA) in Canada and the Australian National University (ANU). The instrument is a fiber fed spectrograph with R<50,000 in two-object mode and R<75,000 in single object mode. The bench spectrograph was integrated at Gemini South from April to June 2022. This paper presents the final integration and alignment of the spectrograph at Gemini South and the measured spectrograph performance at the telescope.
The Gemini High-Resolution Optical SpecTrograph (GHOST) is the next in line instrument being integrated for the Gemini south telescope, in a collaboration between the Australian Astronomical Optics (AAO) at Macquarie University, Herzberg Astronomy and Astrophysics (HAA) at the National Research Council Canada, and the Australian National University (ANU). This paper will discuss shipping considerations and data taken by the NRC-Herzberg and Gemini team to preserve and protect the instrument during a two year hiatus brought on by the COVID-19 pandemic.
The GIRMOS instrument is a multi-object spectrograph with four channels combined with an infrared imager housed within a common cryostat. This instrument will be fed by ground-layer adaptive optics (GLAO) or laser tomography AO (LTAO) corrected light from the Gemini North Adaptive Optics (GNAO) system. The combined instrument will provide unique scientific capabilities such as simultaneous imaging/spectroscopy modes (for precision spectrophotometry) and interleaved imaging-spectroscopy-imaging modes (for characterizing time-variable sources). The National Research Council Canada has recently completed the Preliminary Design of the Imager opto-mechanics. In this paper, we present the driving requirements, as derived from the science cases, and the optical and mechanical designs. The optical design maps a large fraction of the GIRMOS field-of-view onto a single engineering-grade 4Kx4K HAWAII 4RG detector with 21 mas pixels, provided by the Gemini Observatory. The imager produces diffraction-limited image quality across Y, J, H, and Ks-bands across an 85x85” field for an f/32 beam. It includes a location for a full filter complement, an accessible pupil for a cold stop to minimize thermal background, and a pupil imaging mode to align the cold stop to the telescope pupil. The lenses are mounted in cells with rolled flexures or athermalized centering pins and are preloaded to withstand 5g accelerations and provide thermal stability. The filters are housed in a double wheel assembly with cryogenic bearings and roller detents. All of the imager components are connected with a substructure that interfaces with the spectrograph optical bench. This substructure allows for easier testing and integration of the imager, independent from the spectrographs.
The instrument group of the Herzberg Astronomy and Astrophysics has been subcontracted by Australian Astronomical Optics (AAO) at Macquarie University to design and build the bench spectrograph for the Gemini High-Resolution Optical SpecTrograph (GHOST) instrument. The GHOST instrument is being developed for the Gemini telescope and is a collaboration between AAO, the Herzberg Astronomy and Astrophysics (HAA) in Canada and the Australian National University (ANU). The instrument is a fiber fed spectrograph with R<50,000 in two-object mode and R<75,000 in single object mode. This paper presents the i ph and the performance results for the laboratory testing of the spectrograph.
The Gemini High-Resolution Optical SpecTrograph (GHOST) is the newest instrument being integrated for the Gemini telescopes, in a collaboration between the Australian National University (ANU), the NRC-Herzberg in Canada and the Australian Astronomical Observatory (AAO). The GHOST outer enclosure consists of 20 heated thermal panels, forming an encompassing structure with a stationary ‘bridge’ assembly and two removable sections for access. The outer enclosure provides an ultra-stable, dark environment for the bench spectrograph. This paper reviews the outer enclosure construction from a practical standpoint, examining how environmental requirements are met through the thermal panel construction, light seal and dry air system designs. This paper also describes thermal panel production workflow, enclosure assembly methodology, alignment and cable routing challenges. Results of the enclosure's thermal stability verification tests are presented and a list of lessons learned.
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