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Slit with fixed width has been mounted and adjusted

Submitted by public on Tue, 08/14/2012 - 17:56

After analyzing the observed data, the scientific committee of LAMOST telescope decided to use slit with 2/3 fixed width for LAMOST survey (hereafter, 2/3slit). LAMOST technicians have measured the spectra resolution for different spectrograph and optical fibers under the condition of 1/2 slit , 2/3 slit and full open slit. Using 2/3 slit, we can not only improve the efficiency, but also can combine the scientific goals of two working group, which can also improve the usage efficiency of the telescope.

In the summer of 2011, LAMOST technicians have updated the spectrograph slit. After carefully designing and installing, by the end of August, the installation and test of fixed slit on 16 spectrographs have been finished.
The length of 2/3 slit is 144mm, width is 0.22 mm. The technicians have made checking and modification with many times to guarantee straightness of slit to be better than 5um. Many works have been done to guarantee that each fiber can point to the middle region of slit.

(the figure is the 2/3 slit)
After analyzing the observed data, the scientific committee of LAMOST telescope decided to use slit with 2/3 fixed width for LAMOST survey (hereafter, 2/3slit). LAMOST technicians have measured the spectra resolution for different spectrograph and optical fibers under the condition of 1/2 slit , 2/3 slit and full open slit. Using 2/3 slit, we can not only improve the efficiency, but also can combine the scientific goals of two working group, which can also improve the usage efficiency of the telescope.

In the summer of 2011, LAMOST technicians have updated the spectrograph slit. After carefully designing and installing, by the end of August, the installation and test of fixed slit on 16 spectrographs have been finished.
The length of 2/3 slit is 144mm, width is 0.22 mm. The technicians have made checking and modification with many times to guarantee straightness of slit to be better than 5um. Many works have been done to guarantee that each fiber can point to the middle region of slit.

(the figure is the 2/3 slit)