Medium-Resolution Spectrograph (decommissioned)
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Mar
2009 |
Baffling succeeds in blocking glow effect |
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Dec
2008 |
Glow area appears on chip |
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Nov
2006 |
MRS cryotiger back in service |
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Jun
2006 |
MRS cryotiger malfunctions |
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Sep
2005 |
Repaired MRS shutter back in service |
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Jul
2005 |
MRS shutter malfunctions |
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Jan
2005 |
New blind offsetting capability |
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Aug
2002 |
SPIE MRS paper describes the instrument |
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Aug
2002 |
First light |
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The medium resolution spectrograph (MRS) has been available to the HET
community from trimester 2003-2. The MRS is currently functioning in
the basic single object "Direct Feed" mode in the visible beam. The direct
feed mode, which
utilizes what the MOS 0 probe, has a object/sky pair of blue optimized
(Polymicro Technologies (PT) FVP300330370500) and red optimized (PT
FIP 300330370500) fibers that project to 1.5 arcsec on the sky
and yield a fixed resolution of about 7000. The object and sky fibers
are separated by about 10 arcsec. There are also single 2
arcsec red or blue optimized fiber options that yield a resolution of
about 5000. These modes have all been tested with cross-disperser #1
with peak efficiency at 600 nm and efficiency above 2/3 peak over the
450 to 900 nm range available. Quantitative first estimates of the
performance yield, for a S/N=100 per pixel in 1800 sec, a
limiting magnitude of R~ 13.8 at a resolution of 7000; i.e. the 1.5
arcsec fiber, and R~ 14.2 for a resolution of 5000, i.e. a 2 arcsec
fiber. At the 2x2 binning used, a pixel is about 0.02 nm.
Last updated: Fri, 10 May 2024 20:21:36 +0000 sir
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