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AGORA Detector and Physics Plenary Meeting
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Europe/Zurich
Description
Meeting URL:
https://zoom.us/j/99845275219?pwd=JOSplxGdFI1DI5KCKaCbvfwNZ205N3.1
ID: 998 4527 5219
Password: 773321
In person：Joao, Jianchun Wang, Xinchou Lou, Miao He, Yong Liu, Zhonghua Qin, Yiming Li
Remotely：Boping Chen, Fei Li, Feipeng Ning-IHEP, Haijun Yang, Haoyu Shi, Hengne Li, Hongbo Liao, JiaJian TEOH, Mingshui Chen, Mingzheng Yang, Mustapha Biyabi, Qi Yan, Shanzhen Chen, Wei Wei, weidong Li, Weizheng Song, Xiaohui Qian, Xiaoyan Ma, Yang Zhang, Yang ZHOU, Yushan, Zheng Wang, Suen Hou
Quick recap
The meeting covered updates and presentations on the Agora detector project, focusing on the tracker mechanics, calorimeter developments, and physics analysis. 多学科122 reminded participants to register for the new email list and encouraged greater integration with the FCC community by attending relevant meetings. Shanzhen reported on the progress of the Agora webpage, confirming that subsystem pages were updated and broken links were fixed. A presentation on the design and testing of a carbon fiber truss beam for the tracker was given, with discussions on the validity of the testing method and material budget concerns. Mingzheng presented work on using a periscopic light guide to improve calorimeter response uniformity, detailing simulation results and plans for prototype fabrication. Jack shared results from a 2025 beam test of a crystal calorimeter, highlighting its linearity, energy resolution, and the use of machine learning for beamline simulation. Mustafa presented an analysis on measuring top quark electroweak couplings at the CEPC, projecting sensitivities at the per mil to percent level. The conversation ended with a reminder to ensure clarity on the detector model used in analyses before publication.
Next steps
- 多学科122: Remind and encourage all members to attend relevant FCC meetings, especially the software and computing coordination meeting next Monday, and other relevant meetings (analysis tools of Monte Carlo production, Detector Concept Meeting, Muon meeting, FCC eTRAC and PID meeting).
- 多学科122: Coordinate with Xiaolong to prepare the overview talk of the Muon Detector from Agora for the Muon meeting on September 30, and provide necessary help.
- Shanzhen: Continue to update and maintain the Agora webpage, ensuring all subsystem pages are accurate, add more figures if needed, and check for broken links regularly.
- All attendees: Use and test the Agora webpage, and provide feedback to Shanzhen to ensure quality and functionality.
- Mingzheng: Prepare prototype PLGs for experiments, aiming to have prototypes by the end of October, and plan experiments to evaluate performance and compare against simulation.
- Xiaohui (and related team): Evaluate the material budget impact of the current carbon fiber truss beam prototype, and justify the difference from the TDR requirements, considering future improvements.
- Xiaohui (and related team): Plan to perform future tests with a uniformly distributed load for the carbon fiber truss beam, and utilize the CMM machine facility for detailed studies.
- Mingzheng: Consider adding side relay PLG in future work, and further optimize the PLG design considering engineering constraints.
- Jack (and calorimeter team): Continue analysis of the crystal calorimeter beam test data during the CERN long shutdown, focusing on further studies of shower shape fluctuations and detector properties.
Summary
FCC Project Updates Meeting
The meeting covered the agenda for the day, which included discussions on tracker mechanics, calorimeter, and physics analysis on top electric couplings. The group discussed the importance of registering for the new email list and attending FCC meetings to increase integration into the community. Shanzhen reported that updates to the Agora webpage were mostly complete, with suggestions from subsystem contacts implemented, though additional figures may be added later.
Carbon Fiber Truss Beam Prototype
The meeting covered updates on website maintenance and upcoming activities, including three FCC workshops, the CEPC day, and international accelerator and workshop events. Shanzhen confirmed that broken links had been fixed. The main presentation focused on the design, fabrication, and mechanical testing of a 1,000 millimeter triangular carbon fiber reinforced polymer truss beam prototype for the CEPC IDK, detailing the structure, material choices, and fabrication processes. Challenges with the initial design led to modifications, including changes to the fiber placement and core mode structure to enable continuous carbon fiber use and improve bonding.
Carbon Fiber Truss Beam Testing
The team presented their work on fabricating a carbon fiber triangular truss beam, which weighed about 50 grams and used a continuous fiber winding method instead of segmenting bonding. They conducted static mechanical tests under different support conditions (fixed and pin support) and loads up to 550 grams, finding good agreement between FEA results and test measurements for loads up to 50 grams, though creep behavior became noticeable at higher loads. The discussion revealed concerns about the material thickness (400 microns vs. the target 150 microns) and the need to justify using more material than specified in the requirements, with the team acknowledging that while their current approach validates the fabrication process, future iterations may need to optimize material usage.
Periscopic Light Guide Calorimeter Research
Mingzheng presented research on using a compact periscopic light guide (PLG) to improve response uniformity in calorimeters. The team conducted GEANT4 simulations showing that PLG with triple relay rings could improve light collection efficiency and uniformity, with the best results achieved using a circular PLG design with intermediate air gap slits. The research showed that even with one silicon PM, the addition of PLG could lower the stochastic term from 6.2% to 3.8%, with further improvements possible using four PMs. Future work includes fabricating prototypes by end of October for experimental verification and considering side relay PLG implementation despite increased dead space.
Collider Detector Design Presentations
The meeting covered three main presentations discussing detector design and performance for future collider projects.Mingzheng presented on scintillator design, addressing questions about light collection efficiency and explaining how most scintillation light would bounce within the scintillator rather than reaching the silicon photomultiplier directly. The design included chamfer cuts to improve light collection with simulations showing equivalent performance to current iterations.Jack presented results from 2025 beam test campaigns of a crystal calorimeter at CERN, demonstrating that the highly granular calorimeter achieved better than 2% energy resolution and linear response within 1% above 1 GeV. The team developed a generative neural network model for beamline simulation and demonstrated particle identification capabilities using boosted decision trees.Mustafa presented an update on top quark electroweak coupling measurements at the CEPC, showing that the CEPC could achieve per-mil level precision on form factors without requiring polarized beams. The analysis used differential cross-section measurements and demonstrated that operating energies above 360 GeV would not significantly improve sensitivity to the form factors.Key next steps included continuing analysis during CERN's long shutdown period, preparing publications with proper detector specifications noted, and finalizing paper drafts for review before submission.
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