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BTOF demonstrator/mechanics meeting
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US/Pacific
Description
https://ucsc.zoom.us/j/98299273347?pwd=HHm9tGM6hD7aZaIVWWaF16ueAT3gVu.1
Quick recap
The meeting focused on discussing FPC (Front-End Electronics Board) design updates and service hybrid requirements for detector systems. Takashi presented simulations and mechanical design considerations for the FPC, including power consumption estimates and signal transmission structures, though specific power requirements for different voltage levels (1.2V and 2.5V) remained uncertain pending details from Arthur. The team discussed connector options and the need for separate bias voltage lines, with concerns raised about practical limitations and the potential need to group multiple lines together. Andy presented the current design for stave mechanics and service hybrid placement, highlighting space constraints and the need for service hybrids at both ends of each stave, which may require sacrificing some active stave length. Wei outlined the service hybrid design challenges, including power distribution and the need for multiple DC-DC converters, while emphasizing the importance of receiving detailed specifications from the FCFD team. The discussion concluded with concerns about fitting all components within the given envelope and the need for further clarification on power requirements and mechanical constraints.
Next steps
- Artur: Send around the summary document with power consumption and voltage requirements for the FPC (planned for today).
- Takashi: Propose a sketch/model number for the FPC connector(s) and share with the group, especially Tonko, for review.
- Takashi: Start working on a specification document for the FPC that includes requirements from both the FCFD and backend sides, with support from Artur for review.
- Takashi: Make and distribute a list of FPC design parameters among the group, as requested by Satoshi.
- All relevant parties (Takashi, Artur, FCFD engineers, backend team): Collaborate to ensure all interface requirements between FCFD and backend are included in the FPC specification document before prototyping.
- Andreas/Shushu: Continue development and finalization of the stave/tray mechanical design and push to the vault once ready, incorporating feedback from this meeting.
- Andreas: Include in mechanical design clearances for wire bonds (up to 1mm extra) and service hybrids (1.5cm above stave surface at both ends), as discussed.
- Wei: Provide updated information on the dimensions of the service hybrid port to the mechanical design team as needed.
Summary
FPC Updates and Mechanical Tests
The meeting began with Simone Mazza discussing the agenda, which included FPC updates from Takashi and service hybrid discussions. Takashi presented updates on mechanical tests for the FPC, including findings on a 17-micron line and simulations related to current consumption and voltage. He mentioned calculations for power consumption, estimating around 500 milliwatts per ASIC. The meeting also touched on the upcoming PDR page turn and the possibility of discussing ASICs with absent team members like Andy and those from Fermilab.
FCFD Power Requirements Design Discussion
The team discussed power requirements and design considerations for FCFD voltages, specifically focusing on 1.2V and 2.5V power lines. Tonko and Wei highlighted the need for separate lines for different voltage levels, though Artur clarified that the 1.2V circuit could be treated as a single feed. The discussion included details about power consumption estimates and FPC design specifications, with Takashi presenting updated routing plans that included signal lines, control lines, and temperature monitoring capabilities. The team agreed that Artur would provide additional details about power consumption in a change request document to be shared later that day.
Signal Transmission System Design Discussion
The team discussed simulation results and design considerations for a signal transmission system. Takashi presented calculations on differential impedance and signal reflection, noting that a 98 ohm impedance was suitable for signal transmission. The discussion touched on connector options for connecting the FPC to the readout board, with concerns raised about high pin count connectors and insertion force. Simone Mazza experienced technical difficulties with their PC and audio connection but confirmed that FPC would remain as a single unit for now. The team requested more details about connector specifications and sketches to better understand the proposed design.
Detector System Voltage Lines Discussion
The team discussed the number of bias voltage lines needed for the detector system, with Tonko raising concerns about the potential requirement of 2,400 independent high voltage lines. Wei suggested that multiple lines could be grouped together and connected to single power supply channels, potentially reducing the number to a more manageable 288 channels. Artur requested the creation of a specification document outlining requirements for the FPC prototype, including power delivery specifications and backend interfaces, to ensure proper alignment between FCFD engineers and the FPC design team.
Stave Design and Heat Load
Andreas presented the current design of a stave with a green symbol and support structure, explaining that Shushu is developing and finalizing the design details. He discussed installation challenges, noting that the silicon support structure will temporarily use a different tube before transitioning to the GST design once the trays are installed. The main focus of the discussion was on heat load considerations and the need for thermal simulations of the staves, with Andreas seeking feedback on cable positioning and wire bond dimensions to ensure proper stave mechanics and avoid space issues with the symbol tray and TOF mechanics.
Wire Bond Clearance Requirements
Andreas discussed clearance requirements for wire bonds and service hybrids in the detector design. Simone Mazza confirmed that wire bonds typically extend less than 500 microns, while Wei specified that service hybrids require 1.5 centimeters above the stave surface on both sides at the end of each half-stave. The team agreed that these clearance requirements need to be incorporated into the design envelopes, particularly considering the space constraints for sliding trays and avoiding damage to wire bonds.
Cable Routing Design Changes
The team discussed the design changes for cable routing, confirming that the implementation will now occur on both plus and minus Z sides instead of just one side. They clarified that the 7.5cm envelope specification is accurate, though Simone Mazza noted that the internal blue boxes in the diagram are not to scale. The discussion focused on whether to place the hybrid port at the end of the envelope, with Simone Mazza explaining that while this would extend in Z direction, they are still working to make this design work within the constraints. The team acknowledged ongoing challenges with cable integration and installation sequence, particularly regarding the placement of TOF and Cymbal trays after SVT cables begin to fan out.
Detector System Design Constraints Review
The team discussed design constraints and envelope specifications for detector systems. Andreas confirmed that a CAD review would take place during the upcoming Monday engineering meeting to address open items regarding mechanics and service space. Wei emphasized the importance of ensuring the design fits within the officially given envelope without making assumptions about additional space that might become available later. The team agreed that each box could be approximately 35mm in size within the 75mm total envelope.
TOF Detector Design Space Requirements
The team discussed design changes to the TOF (Time Of Flight) detector, specifically focusing on the Z-direction envelope lengths and space requirements for service hybrids. Andreas requested more detailed information about the available space in Z to determine if the current design can accommodate the necessary components, particularly the service hybrids which require 116mm of space. The group agreed that while the fiducial area could potentially be extended, there was no strict physics requirement for the exact dimensions, and they would aim to maximize the sensitive area within the available space.
Service Hybrid Design Power Distribution
The team discussed the service hybrid design, focusing on power distribution and physical constraints. Wei presented a preliminary design proposal that assumes separate lines for 1.2V analog, 1.2V digital, and 2.5V analog power, with each line potentially split into four connectors serving two staves. Tonko raised concerns about the physical envelope constraints, noting that the staggered stave design requires double the width due to parallel placement, potentially exceeding the available 7.5cm space. The team also discussed the need for more detailed power specifications from Arthur, with Wei planning to finalize the design once additional information becomes available. Simone Mazza requested updates to the presentation slides, including information about FPC from Takashi and photos from Satoshi, who also mentioned adding National Central University (NCU) in Taiwan as a fourth assembly site.
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