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MagE Commissioning: November 2007 and January 2008. Scott Burles, Ian Thompson Steve Shectman, Jennifer Marshall Bruce Bigelow, Matt Smith Christoph Birk, Patricio Jones Greg Burley, Jorge Estrada Vince Kowal, Robert Storts Jerson Castillo. MagE Characteristics. - PowerPoint PPT Presentation
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MagE Commissioning: November 2007 and January 2008
Scott Burles, Ian Thompson
Steve Shectman, Jennifer Marshall
Bruce Bigelow, Matt Smith
Christoph Birk, Patricio Jones
Greg Burley, Jorge Estrada
Vince Kowal, Robert Storts
Jerson Castillo
MagE Characteristics
• Broad wavelength coverage for a single object (3100 Å - 1 micron) optimized for the UV ( < 4000 Å)
• Moderate resolution, R = 4200 with 1” slit
• Slit length 10” (0.3” per pixel)
• Slit widths of 0.5, 0.7, 0.85, 1.0, 1.2, 1.5, 2.0, 5.0” + pinholes for focusing
MagE Characteristics
• High spectrograph efficiency:
Goal of 30% including telescope (on blaze)
• Very simple operation and maintenance:– Only moving parts are slitmask, flip mirror,
shutter and collimator focus– Cryotiger cooling
Credit B. Bigelow
MagE Structure and Optical Layout
Off-axis paraboliccollimator
32.3 degree blazediffraction grating
Double-passprism
Schmidt sphericalprimary, f/1.4140mm FL
C1
C2
Focalplane
Rotatormount
Single-passprism
Field flattenerand CCD
Credit S. Shectman
Optical Layout of MagE
7000 Å
3200 Å 4000 Å
1 m
Zemax spotDiagrams
• e2v 42-20 2048x1024x13.5m• Dewar vacuum is maintained with •Varian 2 l/s Ion pump and has reached a vacuum level of 1.4x10-6 mbar, and should last a minimum of 2.5 years.• Both cryotiger cold head and CCD aluminum mount have temperature sensors. In the lab, the cold head reaches -156C and the CCD mount reaches -110C. Dark rate at this temp is 14 e-/pix/hour with ion pump running and is less than 2 e-/pix/hour under dark conditions with the pump off.•Three readout speeds:
MagE CCD Performance
Read speed Read time (s) Gain (e-/DN) RMS noise (e-)
Slow 33 1.02 2.9
Fast 21 0.82 3.1
Turbo 14 1.53 4.2
MagE ThroughputOrder Lambda Dlambda Zeropoint Extra Extinction Efficiency Efficiency
(Å) (Å) (1 ct/s/Å) Flux (Instrument)
20 3125 0.231 17.504 0.191 1.523 0.091 0.171
19 3260 0.244 18.434 0.046 0.952 0.116 0.217
18 3440 0.258 18.791 0.036 0.587 0.12 0.225
17 3650 0.274 19.042 0.042 0.464 0.144 0.270
16 3860 0.292 19.212 0.025 0.37 0.161 0.302
15 4130 0.311 19.438 0.026 0.291 0.198 0.370
14 4400 0.335 19.461 0.024 0.215 0.2 0.375
13 4750 0.36 19.491 0.007 0.176 0.211 0.396
12 5140 0.39 19.503 0 0.114 0.217 0.406
11 5590 0.426 19.415 0 0.117 0.218 0.408
10 6130 0.469 19.316 0 0.085 0.212 0.397
9 6800 0.521 19.125 0 0.028 0.187 0.351
8 7520 0.59 18.682 0 0.004 0.135 0.252
7 8610 0.674 18.057 0 0.149 0.099 0.185
6 9700 0.788 16.3 0 0.027 0.02 0.037
The MagE solar echellogram
•Preliminary wavelength solution yields 0.063 Å (4 km/s) rms
over 13 orders with a 0.7” slit
A Thorium-Argon Hollow-Cathode image
• Spots have FWHM less than 2 pixels over full frame
MagE spot diagrams in lab
The MagE GUI
First Light!
MagE Usage 2008A
• 18 nights MagE only
• 21 nights MagE + other instrument
• 39 total nights scheduled
MagE To Do List
• Replace CaF2 corrector– It was cracked in coating procedure
• Data reduction pipeline functioning– Still work to do in defining optimal flat fields
• May replace Xe flash lamp