Medium-Resolution Spectrograph

DevelopmentsLinks
Mar
2009
Baffling succeeds in blocking glow effect
Dec
2008
Glow area appears on chip
Nov
2006
MRS cryotiger back in service
Jun
2006
MRS cryotiger malfunctions
Sep
2005
Repaired MRS shutter back in service
Jul
2005
MRS shutter malfunctions
Jan
2005
New blind offsetting capability
Aug
2002
SPIE MRS paper describes the instrument
Aug
2002
First light

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: Tue, 15 May 2012 00:39:50 -0500 caldwell



Overview

The Telescope

Technical Overview

Object Observability

Performance

Instruments

HRS

HRS Instrument Summary

HRS - Details

HRS Configurations

HRS Throughput

HRS Wavelength Calibration

MRS

MRS Instrument Summary

MRS Configurations

MRS Throughput

MRS Wavelength Calibration

LRS

LRS Instrument Summary

LRS Configurations

Multi-object Unit

LRS Throughput

LRS Spectral Resolution

LRS Wavelength Calibration

Visitor Filter Information

LRS Position Angles

Blind Offsetting

Guide Stars Limits

LRS Update from Gary Hill

Program Preparation

Web Management System

Other HET Documentation