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MagE Commissioning: November 2007 and January 2008

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.

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MagE Commissioning: November 2007 and January 2008

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  1. 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

  2. MagE Characteristics • Broad wavelength coverage for a single object (3100 Å - 1 micron) optimized for the UV ( l < 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

  3. 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

  4. MagE Structure and Optical Layout Credit B. Bigelow

  5. Optical Layout of MagE Schmidt spherical primary, f/1.4 140mm FL Field flattener and CCD Single-pass prism C1 Double-pass prism 32.3 degree blaze diffraction grating C2 Rotator mount Focal plane Off-axis parabolic collimator Credit S. Shectman

  6. Zemax spot Diagrams 3200 Å 4000 Å 7000 Å 1 mm

  7. MagE CCD Performance • e2v 42-20 2048x1024x13.5mm • 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:

  8. MagE Throughput

  9. The MagE solar echellogram

  10. A Thorium-Argon Hollow-Cathode image • Preliminary wavelength solutionyields 0.063 Å (4 km/s) rms • over 13orders with a 0.7” slit

  11. MagE spot diagrams in lab • Spots have FWHM less than 2 pixels over full frame

  12. The MagE GUI

  13. First Light!

  14. MagE Usage 2008A • 18 nights MagE only • 21 nights MagE + other instrument • 39 total nights scheduled

  15. 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

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