Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 1 Southern African Large Telescope Prime Focus Imaging Spectrograph Optical Integration and Test Plan Eric B. Burgh University of Wisconsin - Madison

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 2 Opto-Mechanical Issues Lens mount design –Sealed triplets, thermal effects, coating issues, etc. Assembly, alignment, and testing –Collimator, camera, gratings, etalons, etc. Integration with mechanisms

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 3 Instrument Breakdown Optics (Lenses/Filters) Gratings Fabry-Perot etalons Polarimetric components Detector Subsystem

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 4 Optics Lens mounting: Coefficient of thermal expansion –Fused silica  0.5 x K -1 –NaCl  44 x K -1 Sealed NaCl triplets –Protection from moisture –Mounting issues AR Coatings –SolGel/MgF 2 –Ruggedness –Application within mounts

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 5 Optics (continued..) Alignment –Collimator (degree of collimation, focus travel) –Camera (focus) Transmission / image quality –Integrated collimator / camera setup –Various combinations of filters –(Image quality testing with Detector Subsystem?) Slit mask verification –Measure width, edge roughness, relative slit positions to verify within tolerances

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 6 Grating Tests Throughput Dispersion Scattering Reproducibility of  VPH Monochromatic beam  PMT/CCD

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 7 Fabry-Perot Etalons Initial testing performed at Rutgers University Integration with PFIS at UW-Madison –Assembly with structure –Alignment with optics –Sensitivity to degree of collimation

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 8 Polarimetric Components Repeatability of wave-plate rotation Wave-plate throughput Polarimetric efficiency Alignment and efficiency of mosaic beamsplitter

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 9 Detector Subsystem Tests that need the Detector Subsystem: Image quality v. field position Field flatness/distortions Instrumental scattered light Detector pixel scale Grating resolution End-to-end throughput/detection efficiency

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 10 Integration Mechanism mechanical integration Control system integration Verification of reproducible alignments Change out of slits/gratings/filters

Oct 17, 2001SALT PFIS Preliminary Design Review Optical Integration and Test Plan 11 Required Lab Equipment Monochromator Continuum and Arc lamps Phototubes/CCD detector Multiple axis and rotating stages