Discussion about possible ECAL/HCAL in 2026

Wednesday 26 Mar 2025, 07:00 → 08:35 Europe/Zurich

07:00 → 07:20 Inputs for today's discussion

Speakers: Hidetoshi Otono (Kyushu University (JP)), Zhen Hu (Tsinghua University (CN))

Hide_250326.pdf

Hide_250326.pptx

07:20 → 07:40 Quick summary from discussion with Jamie

Speaker: Tomohiro Inada (Kyushu University (JP))

Yasu_offaxisdetector_20250319_rev.pdf

Agenda & Discussions

1. Detector Position and Physics Potential

   • The potential impact from the crossing angle needs to be discussed.

   • Evaluated PID capabilities for nueCC vs. numuCC distinction.

   • Jamie recommended clearly defining fiducial volumes to ensure the containment of neutrino interactions, avoiding energy leakage.

2. Trigger Rate Concerns

   • Initially predicted trigger rate at ~3.1 kHz, Jamie raised concerns this could realistically reach ~10 kHz.

   • Required adjustments to trigger threshold and efficiency need to be discussed.

3. Detector Monitoring System

   • Monitoring via Ethernet confirmed, covering temperature and current sensors within detector electronics.

4. Infrastructure, Dimensions, and Transport

   • Detector's dimensions (particularly width) are critical for transport along the LHC.

   • Heavy steel plates within the detector need disassembly/reassembly at the installation site.

   • Tilted installation surface necessitates a support structure ensuring parallel alignment to the line-of-sight.

5. Data Acquisition and Integration

   • Challenges discussed regarding the integration of additional scintillator channels and synchronization with LHC clock.

   • Brian highlighted the difficulty of synchronizing different readout systems->no coincidence trigger between on- and off-axis detectors.

6. Software Calibration and Saturation

   • Current calibration is preliminary?; need precise? calibration for SIPM saturation.

   • Possible need to extend dynamic range due to saturation effects.

7. Overall Considerations and Risks

   • Jamie emphasized significant learning opportunities from 2026 installation despite potential technical limitations.

   • Clear communication on Installation feasibility is essential.

Jamie's Main Concerns

• Precise detector dimensions critical due to transport limitations (maximum width: 110 cm).

• Necessity for mechanical support ensuring detector alignment parallel to neutrino beamline on inclined floor.

• Integration and synchronization complexities between detector and additional veto scintillator systems.

• Importance of including LHC clock signals for accurate event timing.

• Clarification required on the feasibility of trigger adjustments and potential firmware complexities.

Action and Checkpoints

• Obtain and confirm exact detector dimensions and weight details for transportation feasibility. 

• Define and evaluate a fiducial volume for accurate PID analysis and energy containment. 

• Clarify and investigate synchronization methods for additional veto scintillator readout with the existing detector system. 

• Confirm feasibility of including LHC clock and orbit signals into the detector readout system.