Summary
The meeting discussed the design of the HRPPD sensor plane, and aiming for single photon hits in every pixel for full calibration of timing with the monitoring system. Handling large data volumes was highlighted as a significant challenge. Plans were also outlined to address crosstalk issues with a new backplane design for the HRPPD.
Key Points
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HRPPD Sensor Plane Design
- Presentation of the design accommodating various light patterns for the HR PPD sensor plane, including the use of diffusers and fibers between the aerogel and outer mirror. (3:13)
- Clarification on the goal of achieving single photon hits in every pixel of the HR PPD for full calibration of timing. (5:59)
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Data Volume Challenge
- Estimation of the data volume required for the experiment, highlighting the challenge of handling large amounts of data. (10:32)
- Alexander and Craig discussed the need for sparse signals and clean single photons in every pixel to avoid saturation and sagging. (14:49)
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System Layout and Design Ideas
- Bob presented the layout of the system, including details about the laser, fiber delay lines, and timing measurements. (16:57)
- Bob also presented various design ideas involving the fiber, mirrors, and sensor plane, discussing different entry points and potential challenges. (34:04)
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Metrology Reports and End Rings
- Detailed discussion on Sushrut's metrology reports and critical dimensions of the end rings. (41:44)
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Backplane Design for Crosstalk Issues
- Alexander outlined the plan to produce a new backplane design to address crosstalk issues, involving expert consultations, testing, and potential production for multiple sites. (1:06:03)
Next Steps
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Light Output Monitoring
- Bob and Bill to explore using a 1-to-14 splitter for monitoring the light output with one of the 14 outputs. (20:00)
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Connector Pipe Reliability
- Bob and Bill to confirm the use of FC/PC connectors for the connector pipe, ensuring reliability and robustness. (23:35)
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End Ring Feasibility
- Alex to double-check the feasibility of using the existing end rings and report back on their usability, while ensuring a full impact analysis is conducted by Sushrut regarding potential delays, additional manpower requirements, and schedule implications before making a final decision. (39:54)
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PCB Design Review
- Dan is to circulate the finished designs of the twelve-layer PCB with MCX adapters among the experts by the end of this week for review and feedback, aiming to confirm the understanding of the origin of crosstalk and the absence of crosstalk in the proposed new backplane design. (1:04:01)
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HRPPD Testing and Production Plan
- Once the behavior is confirmed as acceptable with HRPPD testing, Dan to define the quantity of sets to be produced, starting with a bare minimum set to minimize costs and proceeding with additional sets if needed, targeting completion after successful testing. (1:06:21)
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