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[Wenliang Li <wenliang.b.li AT gmail.com>]

Dear all,

Please see the meeting minutes from today's pfRICH mechanical design meeting.

Many thanks

Bill

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Summary: The meeting addressed various updates and progress on several fronts, including foam development, mirror reflectivity upgrades, Lexan sheet orders, alignment issues with HRPPDs and aerogel, benchmark envelope design for the light monitoring system, and mirror mounting options. The focus was on finalizing designs for production and proposing solutions to enhance performance.

Key Points:

• Alex requested an update from Charles regarding foam progress, leading to detailed discussions on vessel construction plans following the receipt of the recent foam form.
• Updates from Bill, Preet, and Charles were prompted by Alex regarding mirrors and upgrades, with Bill providing insights into material receipt, motor controller, and upcoming tasks related to mirror measurements and evaporation plans.
• Bill discussed the necessity for Lexan sheets of varying thicknesses, confirming order details and sizes for the sheets to be sent out to Perdue and Yale.
• Alignment issues with HRPPDs and aerogel were explained by Alexander, proposing solutions such as adjusting the number of tiles per band to address dead areas affecting timing performance and imaging.
• Bill suggested designing a benchmark envelope for the light monitoring system, emphasizing iteration based on Monte Carlo guidance to avoid overlapping envelopes and provide feedback to Fernando.
• Alex deliberated changes between prototype and full sensor plate designs, focusing on rotational symmetry, mirror mounting, and the beam pipe hole.
• Benefits of using dowel pins to mount mirrors securely were discussed by Alex, considering factors like air evacuation and material choices.
• Alex proposed adding material and creating a mounting scheme for mirrors to finalize the design for production.

Next Steps:

• Schedule a separate meeting to review and make progress on designing an envelope for the sensor plane, with Bill taking the lead in designing a benchmark envelope and iterating on the instrumentation requirements.
• Avoid drilling through the laid-up structure of the sensor plane, considering placing diffusers and ports on the outside of the satellite instead to maintain structural integrity.
• Alex to finalize the mirror mounting scheme based on the discussed iteration and send out the finalized geometry for production by the next meeting.