The LAMOST low resolution spectrograph stability performance

摘要

One of the Large Sky Area Multi-Object Spectroscopic Telescope (LAMOST) scientific requirements require the abilityof the low resolution spectrograph(LRS) to measure velocities to a accuracy of 4km/s over the entire 5 degree field in 2hours objects observation. This requirement results in the specification of image movement less than 0.6μm/hours(0.05pixl/hours corresponding to the science detector).There are 16 spectrographs for LAMOST telescope, so we expectthe design aspects of the instrument directed towards achieving the stability goal. In this paper we present the last designaspects of the instrument which enable meeting the 4km/s requirement, and the recent test results of the LRS’s StabilityPerformance. The test results show that the stability performance of LAMOST-LRS can meet the the stability goal, theimage shift along the direction of dispersion is not influenced by the external factors, and the image shift along verticaldispersion direction meet the technical requirements when the environmental temperature of the spectrograph room is incontrol.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.