STUDY SUMMARY - IPMU

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<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Figure 3.8-1: The proposed configuration of the WFMOS A&G System. A coherent fiber bundle reimages the focal plane onto the A&G Camera. 3.9 Prime Focus Instrument The elements just described—the Acquisition and Guide Cameras, the field element, the positioner subsystem and the other telescope-mounted components except the metrology cameras—form the Prime Focus Instrument (PFI) and are mounted on the PFI structure that interfaces to the PFU) (Figure 3.9-1). The critical function of the PFI structure is to establish and maintain alignment of these subsystems to the WFC. There are two major elements of the PFI structure: the rotating portion that interfaces to the PHSC rotator and the fixed portion that interfaces near the upper end of the PHSC hexapods. 31
<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Figure 3.9-1: The Prime Focus Instrument The rotating portion interfaces to the PHSC Rotator with a bi-conic structure and supports the Positioner Assembly and associated fibers, the fixed fiducial system, and the acquisition and guide cameras (Figure 3.9-2). The bi-conic structure provides initial alignment of the positioner to the WFC and is tuned in stiffness such that the defocus, decenter, and pointing of the Positioner Assembly matches that of the WFC within the required limits. The most critical alignment requirement is the focal plane tilt of 34 arcsec with respect to the WFC. This appears to be readily achievable since this is on the same order as the predicted WFC tilt with respect to the telescope over its 60 degree operational elevation. 32
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STUDY SUMMARY - IPMU

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