Low-Resolution Spectrograph 2
For indepth details about the LRS2 instrument please see the SPIE paper by
Taylor Chonis et al. 2014 and Taylor Chonis et al. 2016
The second generation Low Resolution Spectrograph (LRS2) is a new facility instrument for the Hobby-Eberly
Telescope (HET). Based on the design of the Visible Integral-Field Replicable Unit Spectrograph (VIRUS). LRS2 provides integral field spectroscopy for a seeing-limited field of 12"x6". The IFU are fed by 0.6" lenslets
Shown in b) is a detailed view of the microfocalreducer, which consists of a field lens and two lenslet arrays. The optical path of a single spacial element is detailed in c) above.
And the spacial elements arrayed into a block 12"x6". The coverage is complete within an IFU so no dithering is required.
LRS2 is spread between two fiber-fed dual-channel spectrographs, each of which can operate as an independent instrument. We call these LRS2-B and LRS2-R for their blue and red coverage. In the plot below we show the relative coverage. The percentage throughput comes from theoretical predictions of just the instrument without the HET or sky. For a discussion of the LRS2 throughput please see LRS2 throughput.
The resulting resolving power and wavelength coverage are given in the table below:
Last updated: Thu, 23 Nov 2017 16:00:52 -0600 shetrone