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BTOF demonstrator/mechanics meeting
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Description
https://ucsc.zoom.us/j/98299273347?pwd=HHm9tGM6hD7aZaIVWWaF16ueAT3gVu.1
Quick recap
The meeting focused on updates and coordination regarding thermal cooling studies and stavelet design for the detector project. Simone Mazza presented their setup for thermal measurements using a water pump, temperature sensors, and flux measurement equipment, with plans to complete the first stavelet assembly within a month pending final design approval. The team discussed material choices for cooling tubes, with Rachid advising against titanium due to previous corrosion issues and recommending stainless steel or 3D printed carbon fiber alternatives. Aidan Tiernan confirmed his plan to focus on full stave thermal studies starting in October rather than December, to allow time for iterations before the June FDR. The group also discussed the 23 kilowatt heat load requirement and potential challenges with power dissipation, agreeing to explore both reducing the coolant temperature and considering additional cooling lines if necessary.
Next steps
- Simone Mazza: Complete the assembly of the first stavelet for thermal studies within a month, once the final stavelet design with stiffener is received.
- Simone Mazza: Send one assembled stavelet to Andy's group at Purdue for their cooling studies.
- Aidan Tiernan: Develop basic programs for reading out the Hall effect flow meter and temperature sensors in the cooling setup.
- Andy: Start finite element analysis and mock-up studies for the full stave cooling (spanning 7 stavelets) by October, with the aim to iterate before the FDR in June.
- Andy: Work on the Inspection and Test Plan (ITP) for the full stave and mechanical support, incorporating existing documentation and new designs.
- Surabhi: Review the draft ITP document for the stavelet that Simone Mazza uploaded.
- Jenny: Work on the ITP for the sensors (both pixel and strip), as a single document.
- Anish: Present FEA updates and geometry work in future meetings to bridge the communication gap.
- Andy: Follow up on the Forward TOF (FTOF) design and interfaces with the relevant groups (e.g., Oak Ridge).
- Simone Mazza: Upload the ITP draft document link in the meeting agenda for access and feedback.
Summary
Thermal Measurement Setup Progress Update
Simone Mazza provided an update on the thermal measurement setup, which includes a water pump, temperature sensors, and a flux measurement sensor for testing a mini fridge with a water reservoir. The team is waiting for a final stavelet design with stiffeners before proceeding with assembly, which will involve gluing silicone stavelets to carbon fiber using a thin adhesive film. Surabhi asked about Aidan Tiernan's role in cooling studies, and Simone Mazza explained that while they are currently working at the stavelet scale, Aidan Tiernan could potentially conduct larger-scale cooling studies spanning the entire stave in the future.
Tablet Component Testing Timeline
The team discussed a timeline for assembling and testing tablet components, with Simone Mazza explaining they need approximately 8-9 months until June next year for the full process. Simone Mazza outlined the plan to first demonstrate assembly of one tablet stavelet, then have Andy load a full stave, and return a stave to Santa Cruz for testing. Aidan Tiernan presented details of a cooling setup including a pump, Hall effect flow meter, needle valve, and temperature sensors, which will be used to test cooling performance over different flow rates.
Cooling Tube Material Selection Discussion
The team discussed material choices for cooling tubes, with Rachid advising against titanium due to surface roughness issues that create vortices and cooling problems, recommending stainless steel instead. Dan raised concerns about thermal conductivity differences between copper (400) and stainless steel (17), noting this could affect representation accuracy. The group agreed to characterize cooling for multiple materials once the setup is complete, and Surabhi suggested Andy should focus on finite element calculations and mock-ups for the combined stavelet cooling effect, with December as an ideal start timeline for this work.
Cooling System Design Planning
The team discussed setting up a cooling system with a pump, temperature sensor, flux sensor, and copper tube, with plans to complete the first assembly of a stavelet within a month and build two units for testing. They agreed to work on thermal studies for a full stave with seven stavelets starting in October rather than December, to allow time for iterations before the FDR in June. The group also discussed the 23 kilowatt heat load challenge, with Andy emphasizing the need to design for the most realistic thermal load rather than trying to reduce it, and they agreed to explore options like chilling the water or using more exotic coolants if necessary.
Stavelet Testing Collaboration Discussion
Andy proposed shipping a stavelet to Brookhaven for testing using their negative pressure circulators, and Simone Mazza confirmed they have appropriate heat source probes from previous projects. The group also discussed material choices for thermal connections, with Simone Mazza warning against using aluminum with carbon fiber due to potential corrosion issues, suggesting 3D printed carbon fiber alternatives instead. Simone Mazza shared a draft ITP document for stavelets that needs review from the consortium, and the team agreed to combine sensor ITP documents into a single document.
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