STUDY SUMMARY - IPMU

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<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Table 3.12-1: Spectrograph requirements based on the four surveys. The first three rows are a repeat of the science case. The other rows are derived requirements. Requirement DELZ DEHZ GALR Blue Red GAHR Min λ (nm) 630 420 480 818 480 Max λ (nm) 970 670 544 885 680 Resolving power 3500 1500 5000 5000 20000 SRE width (Angstroms) * 2.82 3.63 1.03 1.70 0.29 Number of SREs per spectrum 1488 688 680 412 6897 Number of spectral orders per fiber 1 1 1 1 4 Length of a single spectral order (mm) 80 37 37 22 93 No. of spectrographs required 2.6 1.2 1.2 0.7 3.0 % of detector area used 86.3% 39.9% 36.3% 22.8% 100% * SRE – Spectral Resolution Element Table 3.12-2: Basic derived spectrograph parameters. These are driven by the GAHR survey, which is the most demanding of the four surveys. Detector format for one spectrograph Format of a single CCD Number of spectrographs 3 93 mm × 93 mm 93 mm × 46.5 mm, buttable along the long side Collimator f-ratio Camera f-ratio Minimum beam size Fiber pitch at slit Projected fiber size at detector f/2.12 f/1.07 ~300-mm diameter 230 µm, center to center 54-µm diameter SRE* width (µm at detector) 54.0 µm SRE height (µm at detector) = projected fiber pitch 116.25 µm * SRE – Spectral Resolution Element 47
<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Figure 3.12-1: The optical design of a single WFMOS spectrograph, shown here as configured for the GAHR survey. The diameters of the major optical elements are shown in millimeters. Figure 3.12-2: CAD model of one of the three identical spectrographs, shown here as configured for the GAHR survey. The table is approximately 5 m × 3 m. 48
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STUDY SUMMARY - IPMU

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