[AI generated minutes + Human correction]

Participants: James, Mark, Wilfried, Justus, Jüri, Gabriela, Lukas (absent), Hampus (absent)

Cadence & Process

• New combined BIPXL JIRA board for all Timepix-related projects (BGI, telescope, some BLM/R&D).
• Priorities simplified to High / Medium / Low. First part of each bi‑weekly meeting will review High priority items.
• Next meeting: in 2 weeks.

Key Upcoming Dates

• Telescope test beam starts (effectively) next Wednesday.
• SPS MD with LHC(-like) multi‑bunch beam next Thursday for BGI vs wire scanner cross‑comparison.
• Beam size review: 22 Sept (prepare SPS results).
• Lukas vacation: end of August.

Technical Status & Discussion

1. SPS BGI / Beam Size Review
• Horizontal detector “brick with more holes” survived AWAKE-like high-rad beam (bunch rotation / compression).
• Plan: show SPS profile evolution and robustness in review.
• Next Thursday MD: acquire comparative data (BGI + wire scanner).
2. Telescope & Timing
• Previous timestamp issue traced to miscalculated fine ToA resolution and wrongly adding the fToA, also GBTXs are now correctly configured.
• Raw Timepix data now plausible; need to validate delayed pixels (~150 ns offsets) vs timewalk or anomaly.
• Observed event rate ~1 kHz (lower than theoretical); need to confirm if readout or configuration bottleneck.
• Closely spaced telescope setup on granite table starts Wednesday (two XY stages, optical rail, two planes per rail).
• Cosmic ray telescope scintillator setup ready; may be optional given imminent beam setup.
3. Telescope Infrastructure
• “Home base” relocation mostly done; PPE128 installation updated.
• Minimal test setup operational; system test epic starts next week.
• Need cable length/delay documentation (TDR device hard to use; fallback oscilloscope).
4. PS BGI Horizontal Issue
• No ionization electrons detected since Christmas despite correct HV (~30 kV) and bias.
• Findings: ToT plot order non-sequential (fixed); full decode disabled (fixed); ToTs now reasonable; detector 3 still problematic; Ikrum differences likely incidental.
• Hypotheses: sensor surface contamination (near pump), configuration fault, hardware degradation.
• Options: (a) Diagnose current unit (remove, measure HV & bias path conductivities) (b) Assemble and install spare (inventory flex cables, edgeless sensors).
• Constraint: PS geometry—SPS sensor pair may not fit side-by-side; may need more (edgeless) sensors; potential ordering urgency.
5. GBTX Configuration Reliability
• New gateware requires running full register config twice to achieve stable sync; first pass yields partial/noisy links.
• Current state machine likely insufficient; ad‑hoc delays (sleep up to 1 s) required.
• Need clearer reset / configuration sequencing and robust completion criteria.
6. Software / DMA
• DMA (XDMA) migration mostly done; pending EDGE driver work.
• V5 software meeting to be organized (next week proposed).

Decisions

• Maintain bi-weekly meeting format.
• Proceed with telescope granite-table deployment Wednesday.
• Use Thursday MD for BGI–wire scanner cross-validation.
• Defer extensive cosmic data unless spare capacity.
• Prepare to intervene on PS horizontal if no progress soon (parallel diagnosis + spare assembly planning).

Open Issues / Risks

• Unresolved root cause for PS BGI horizontal (risk to operational readiness).
• GBTX config instability (risk to data quality / automation).
• Low event rate vs expectation.
• Time pressure: need MD data analysis before Lukas vacation.
• Potential sensor supply constraint for PS replacement.

Action Items

Follow-Up Next Meeting

• MD data results & comparison plots.
• Status of PS horizontal diagnostics or replacement decision.
• GBTX configuration reliability improvement.
• Telescope deployment progress & initial timing validation.
• Event rate investigation findings.
• DMA / driver integration status.

End.