The Gemini bHROS instrument, (Bench-Mounted High Resolution Optical Spectrograph) was delivered to the Gemini South Telescope in March 2003, after passing it's onsite acceptance test at UCL (University College London). The instrument was installed through the 2003 period, getting its final components, the fibre system, in September of that year. A number of nights were then allocated to the instrument to verify it throughput.
This paper discusses the installation of the bHROS system in the pier lab and the difficulties encountered getting an accurate measure of the throughput of the system. An overview of the measured performance of the instrument and details of additional, proposed, system enhancements is given and an indication of the timescales for its release to the astronomical community is discussed.
A design for HROS has now been developed which is able to meet the science requirements as specified by the community. This design calls for a Cassegrain-mounted échelle spectrograph with a resolving power of R=50,000. Efficiency is maximised both by the location at the Cassegrain focus, and by the adoption of prism (as opposed to grating) cross-dispersion. All of the transmitting optical elements will be made of fused silica, to maximise to efficiency in the UV. The design relies on the concept of an 'immersed' échelle, in which the ruled surface of the échelle grating is 'immersed' in a fused silica prism.
This paper outlines the working of the HROS instrument and summarises the progress that has been made on the project, on a modular level.
The reader is also refered to 3 additional paper in these proceedings. Paper 4008-14 discusses the flexural performance of this instrument, paper 4008-15 discusses the optical design of the instrument and paper 4008-98 describes the Active Flexure Compensation (AFC) that is to be used on the HROS instrument.
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