First Light !Installation of the spectrograph at the telescope in its thermally controlled chamber began on July 10 and was mostly complete by July 27. The four optical fibers were connected to the Cassegrain adapter on July 20, when the first measurements of actual fiber train throughput were made.
A detailed alignment procedure started soon thereafter when the final settings of the optical train were made, including grating and CCD fine positioning. This led to the first spectrum of a star (51 Peg, of course !) on the night of 31 July-1 August.
By the end of the week (August 6) most of the essential hardware and software had been tested in its different configurations, including automatic reduction and order extraction.
For the two configurations (high-efficiency or HE and high-resolution or HR), the two fibers have approximately the same throughput. In order to achieve a higher spectral resolution the HR fibers have a 40 micron exit slit, and their throughtput is consequently a factor of 2.5 smaller, including the effects due to the optical scramblers.
The second part of the commissioning phase will take place on August 21-28, when the wavelength calibration, automated cross-correlation and order merging software will be tested and other components upgraded.
More details will be available in this page as soon as they become available.