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Transcript 
NIRSpec Overview
Jeff Valenti
2006 May 19
TIPS/JIM
Vertical Field Position (arcmin)
Instrument Apertures
4
TFI
FGS
2
0
-2
NIRCam
NIRSpec
MIRI
-4
-8
-6
-4
-2
0
2
4
Horizontal Field Position (arcmin)
6
8
Multi-Object Spectroscopy
Schematic Light Path
Telescope
Focus
f/20
Pickoff
Mirror
Filer
Wheel
Fore
optics
Grating
Wheel
MSA
f/12.5 Collimator
Detectors
f/5.67
Camera
Optical Components
Collimator
Filter
Wheel
Coupling
Optics
Optical
Bench
Camera
Fore
Optics
Detectors
Grating
Wheel
Integral
Field
Unit
Micro
Shutter
Array
Focus
Mirrors
Light Path Movie
Configurations
Filter Wheel
Grating Wheel
0.96 - 1.24
Mirror
0.78 - 2.10
Mirror
Clear (0.6 - 5.0)
R=100 Prism
>1.0 (1.0 - 5.0)
R=100 Prism
>0.7 (0.7 - 1.4)
R=1000 Grating #1
>1.0 (1.0 - 1.8)
R=1000 Grating #1
>1.7 (1.7 - 3.0)
R=1000 Grating #2
>2.9 (2.9 - 5.0)
R=1000 Grating #3
>0.7 (0.7 - 1.4)
R=2700 Grating #4
>1.0 (1.0 - 1.8)
R=2700 Grating #4
>1.7 (1.7 - 3.0)
R=2700 Grating #5
>2.9 (2.9 - 5.0)
R=2700 Grating #6
Fixed Apertures
Spatial
3.5”x0.2”
3.5”x0.2”
Dispersion
4”x0.4”
2”x0.1”
3.5”x0.2”
Integral Field Unit
(Image Slicer)
Q1 Q2
10
Microshutter Array
Q3 Q4
10
4365171
250K Shutters
10
Magnet Sweep and Shutter Addressing
QuickTime™ and a
YUV420 codec decompressor
are needed to see this picture.
Microshutters
Facing the Detectors
Facing the Sky
Open Area: 0.20” (spectral) x 0.45” (spatial)
Shutter Pitch: 0.26” (spectral) x 0.51” (spatial)
MSA bars are 0.06” wide
Shutter Throughput
1.4 μm
2.4 μm
4.0 μm
• Better throughput near center of each shutter
• Better flux calibration where gradient is shallow
Current Issues





NIRSpec detectors achieved TRL6 !
Microshutter technology is still evolving
Stray light pentrates unbaffled telescope
No requirement limiting plate scale changes
Prism design may change
Specify Target Acquisition Algorithm
Develop Prototype of MSA Tool



Typically one aperture per target
Multiple shutters per aperture
Shutter purpose




Target
Background
Closed
Used by pipeline
Develop Exposure Time Calculator
Begin Developing NIRSpec Pipeline
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