Transcript CWI (slides 1/2)

Palomar: Cosmic Web Imager
Who are CWI?
Khanh Bui (Structure design)
Daphne Chang (Opto-mechanical lead, GRA)
Matt Matuszewski (Grating, articulation unit, GRA)
Chris Martin (PI)
Anna Moore (System Lead)
Patrick Morrissey (Detector)
Shahin Rahman (Software, GRA)
What is CWI?
Optical spectrograph for 200” Hale telescope
designed specifically for high resolution
spectroscopy of low-surface-brightness extended
emission with exquisite sky background subtraction
Based on slicer-IFU, 50” FoV, R~5000
Science goal:
Science goal is to directly detect faint cosmic web
and circum-galactic medium emission at high
redshifts
First light late 2008
CWI shown mounted to the Cassegrain station
of the 200” Hale telescope, without enclosure
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All-hands meeting 31st Jan 2007 Anna Moore
Palomar: Cosmic Web Imager
The camera and dewar assembly
must rotate about the center of the
grating
Collimator
IFU
VPH grating
Camera and
dewar
Side view/zenith pointing
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All-hands meeting 31st Jan 2007 Anna Moore
Infrared Imaging Spectrograph
(IRIS) Concept Design
James Larkin PI (UCLA)
Anna Moore co-PI (Caltech)
First light instrument for TMT (2016?)
~1 year CODR study with review in Feb 2009
~450k study, 1/3rd to COO
0.8-2.5mm, imager and IFU R<4000
Imager: FoV 10” goal
IFU(lenslet): 4/9 mas/pixel; 2” FoV
IFU(slicer): 22/50 mas/pixel
Spectrograph offers high strehl lenslet and high
efficiency slicer
Large part of CODR is to combine lenslet and
slicer optics efficiently
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All-hands meeting 31st Jan 2007 Anna Moore
IRIS Envelope Dimensions
The generic instrument
envelope is a 2m dia.
cylinder extending 3.75m
axially from the interface
plane
– A “snout” portion protrudes
0.5m into NFIRAOS
– Maximum total instrument
length = 4.25m
The instrument centre of
mass is required to lie on
axis, 2.25m from the
interface plane
INTERFACE PLANE
SNOUT 0.5m
ROTATOR
BEARING e.g.
ROLLIX 02-1415-00
2.25m
4.25m
C of M (5T)
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All-hands meeting 31st Jan 2007 Anna Moore