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Summary of PHEMOS UV Imager Task Status and Optical Design Considerations

This summary outlines the current status and key tasks regarding the PHEMOS UV Imager project. A contract was signed with the University of California in December, and feedback on scientific requirements has been provided. Investigations into optical design concepts have commenced, along with a review of designs from other programs. Key issues include acquiring Zemax design files, understanding environmental and performance assurance requirements, and making strategic decisions on various optical components. The optical engineering team is prepared to advance with the design of the image intensifier.

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Summary of PHEMOS UV Imager Task Status and Optical Design Considerations

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  1. PHEMOS UV Imager Summary

  2. Status on Tasks COM DEV and U of C signed a contract in December • Provided feedback on science requirements • Started to look at optical design • Investigation into design concepts • Reviewed some of the U of C optical designs generated on another program • Started to investigate image intensifier

  3. Summary of Issues/Questions • Can U of C provide zemax design files for their designs? • Environmental requirements? • What are the Performance Assurance requirements? (reference section 4.4.3 of PHEMOS SOW) • What is the life requirement? • Which way is 40 degree offset from nadir? In the orbit plane? Why is it there? Is it constant? • Solar illumination angles

  4. Image Intensifier Trades include; • Diameter 25 mm vs 40 mm • 25 mm smaller volume, 40 mm better SNR and better resolution/lower risk • Material, MgF2vs BaF2 • Photocathode material • ”Solar Blind” has better efficiency ~ 30 %, but poor vis rejection • Cesium Iodide very good visible rejection above 190 nm but low efficiency ~ 2% (cuts off quickly, so LBH-Low may have 3%) • KBr on MCP, better performance but would need likely development • Photocathode to MCP gap • 100 microns is performance limit, best spatial resolution • 200 microns lower vibration risk, but higher blurring

  5. Image Intensifier Trades include; • Phosphor material, likely P43 but others will be investigated • P43 has good efficiency, fast enough • MCP details • single stage vs double stage • Thickness, pore size, bias angle, voltage range • Number of fibre optic elements • 1, 2 or 3 • Impacts on risk and subcontract structure

  6. Summary • Requirements have been defined • Optical engineering team is engaged and ready to move ahead with optical design • Developing Image Intensifier conceptual design • CCD/CMOS selection will begin soon

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