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2) Quick reference specifications and operating options a) Gratings: All the gratings are 128 x 154 mm 1st-order blazed plane reflection gratings. The Lowell DeVeny grating complement is shown in Table I. A preliminary assessment of instrumental efficiency vs. grating is shown in Figure 1. Table I. DeVeny Gratings g/mm Blaze Wavelength (Å) Dispersion (Å/pix) Free Spectral Range (Å) R (2.5pixel) 150 5000 4.3 8800 450 300 5000 2.17 4440 920 400 8500 1.66 3400 2850 1200 5000 0.58 1180 3450 2160 5000 0.33 670 5250 Comments GoldCam 201 4630 Å red tilt limit DeVeny+Telescope+Fold Mirror Efficiency vs. Grating 0.20 400g/mm+GG495 300g/mm 150g/mm+OG570 0.15 Efficiency 150g/mm 0.10 0.05 0.00 4000 6000 8000 10000 Wavelength (A) Figure 1. On-sky measured DeVeny efficiency vs. grating. The vertical line at 6000 A shows where 2nd-order leakage would begin for unfiltered spectra. The spectra were taken with a 5 arcsec wide slit, on 20150507, of 3
