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52-207 Sacramento River (SLAC)
52-207 Sacramento River
SLAC
Description
Zoom link: https://cern.zoom.us/j/61664971445?pwd=EOQQYVnvgMKlTNMMbOlhrp7R6a6IaP.1
Passcode: 426998
E-mail list: 5d-calorimetry@listserv.slac.stanford.edu
Meeting summary
Quick recap
The meeting focused on discussing the next steps for the LDRD (Laboratory Directed Research and Development) project involving the design of digital silicon photomultipliers (SPADs) and time-to-digital converters (TDCs) for a future particle detector. Boyan provided updates on the project status, noting that while the EST microelectronics PDK has been obtained after legal and installation challenges, the team is still waiting on test structures from the University of Edinburgh. The group discussed technical specifications including SPAD resolution of 10 picoseconds and the need for multiplexing due to space constraints, with Boyan estimating that approximately 9 spots could share a single TDC. Dong suggested focusing initial efforts on adopting existing chip designs rather than building everything from scratch, particularly for the readout system. The team also discussed integration considerations for different photon types (Cherenkov vs scintillating fibers) and the importance of FCC-focused simulations to demonstrate relevance to the field. Chris mentioned potential involvement in future meetings and presentations, including the linear collider workshop and CPAD conference, while Ariel proposed creating a Google Doc to organize the work and assign responsibilities among team members.
Next steps
Ariel
- Update the slides based on the discussion, especially regarding integration and testing considerations.
- Create a Google Doc to organize work, collect ideas, and assign tasks among the team members.
- Send out a survey to find a new meeting time that accommodates everyone's schedule.
- Follow up with Chris regarding the abstract submission for the Linear Collider Workshop and possible extension of the deadline.
Bojan
- Plan the detailed design and architecture with Lorenzo once the physics specifications are provided.
- Provide monthly updates on the progress of the chip design.
Chris
- Consider giving a talk at the Linear Collider Workshop and coordinate with Ariel on the abstract submission.
- Discuss with Bojan about existing chips that could be adapted for readout and testing with minimal effort.
Dong
- Discuss with Bojan to identify existing chips that can be adapted for the readout and testing phase.
Nural
- Organize a discussion with IDEA people and within the team to align efforts on the overall detector concept.
Sally
- Assess the infrastructure and hardware requirements for potential testing of prototypes at the university.
Summary
LDRD Project Progress Update
Bojan provided an update on the LDRD project, noting that while detailed planning hasn't started yet, the team expects to be ready to begin design work next month. He reported that Lorenzo has made significant progress on obtaining and setting up the EST microelectronics PDK, though there were delays due to legal issues and summer schedules. Bojan also mentioned they are still waiting for test structures from the University of Edinburgh team, though contracts may have been signed recently. He requested physics specifications including pixel requirements and resolution ranges before proceeding with architecture planning.
TDC Resolution Feasibility Discussion
Bojan discussed the feasibility of TDC resolution and range, suggesting a 10 picosecond resolution as achievable, though larger ranges would require more bits and increase data transmission area. The team agreed to follow up with simulation studies to provide specific ranges and specifications for Boyan to work with, with plans to keep the team updated on progress.
TDC Chip Design Strategy Discussion
Bojan explained that they have no existing projects in STMicroelectronics and will need to design a TDC and readout system from scratch, with questions remaining about operating speed requirements and data transmission needs. Dong suggested focusing on adopting an existing chip design rather than building everything new, particularly starting with a megahertz-level implementation. The group agreed to explore using existing chip designs as a minimum effort approach, with Bojan and Dong planning to discuss potential options further.
SPAD Chip Integration Planning
The team discussed the integration of SPAD (Single-Photon Avalanche Diode) chips for testing different types of photons, including Cherenkov and scintillating fibers. Chris emphasized that blue-ultraviolet light for Cherenkov photons should be prioritized, while Ariel noted the need to consider different readout schemes for various photon types. The group agreed to update the slides to reflect these discussions and to begin planning for the integration process, including mechanical considerations and potential optimization for different photon types.
Prototype Testing and Integration Planning
The team discussed testing opportunities for prototypes and the need to assess required infrastructure and hardware support. Ariel suggested creating a shared document to organize the work among team members. Dong raised concerns about how the 5D concept fits within the overall detector framework, particularly regarding the integration of crystal and fiber-based approaches. Nural acknowledged the need for further discussion about resource allocation between generic development and specific physics-focused work for future colliders.
Calorimeter System Development Planning
The team discussed their approach to developing a calorimeter system, with Ariel advocating for pursuing physics performance and dual radial particle flow in parallel rather than a sequential design-simulation approach. Dong suggested focusing on questions that would most influence the digital SIPM requirements, while Chris clarified that simulations should target FCC environments to maximize energy reconstruction and jet discrimination capabilities. The group agreed to maintain alignment with their previous Flash pre-proposal plan in the short term, with the understanding that they would need to determine specific personnel assignments and roles.
Team Project Role Organization Discussion
Ariel and Chris discussed organizing their team's roles for an upcoming project, with Ariel suggesting they create a Google Doc to document responsibilities and potentially assign names to tasks. Ariel mentioned that while funding is limited to covering engineers and chip costs ($300,000), they have identified potential team members including graduate student Pumar and machine learning expert Michael Cayon. Chris informed Ariel that Texas Tech University plans to hire a postdoc, offering potential collaboration opportunities. The conversation concluded with a brief mention of an upcoming USFC workshop in a few weeks, though they did not finalize whether to submit an abstract.
Linear Collider Workshop Planning
Ariel and Chris discussed submitting an abstract for the linear collider workshop due Friday, with Chris potentially giving a remote presentation about Flash technology and digital signal processing designs. They agreed that Boyan or Lorenzo should present at CPAD with more technical details about TDC spot designs. The team decided to explore finding a new meeting time since Boyan and Lorenzo have scheduling conflicts, and Ariel will send out a survey to find alternative dates.
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