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BIPXL - BiWeekly Meeting

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865/1-B03 (CERN)

865/1-B03

CERN

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BIPXL - BiWeekly Meeting
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67496887811
Host
James Storey
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[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

Action

Owner

Create JIRA ticket: inventory parts (flex cables, edgeless sensors) & replacement plan for PS horizontal

James

Analyze Thursday MD data promptly (profiles, cross-check with wire scanner)

Lukas

Validate delayed pixel clusters (150 ns) vs Timewalk; filter criteria for hit assembly

Lukas / Hampus

Investigate event rate limitation (readout path, throttling)

Lukas / Justus

Inventory edgeless sensor stock; assess need/order lead time

James / Mark

Assemble spare instrument (if parts sufficient)

James + Mark + Wilfried + Hampus

Prepare granite-table telescope hardware (stages, rails, planes) for Wednesday

Justus (+ Mark assist)

Document cable lengths & propagation delays (oscilloscope fallback)

Wilfried / Justus

Refactor GBTX config state machine (deterministic sequencing, remove double-run)

Hampus

Clarify reset signal usage & document recommended sequence

Justus

Organize V5 software meeting next week

Jüri

Continue DMA migration; coordinate EDGE driver integration

Gabriela / Jüri

Provide pulse generator timing characterization for scintillator reference

Mark

Send meeting transcript and minutes

James / Jüri

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.

 

There are minutes attached to this event. Show them.
    • 14:00 → 14:20
      Status of "High Priority" BIPXL JIRA Issues 20m

      https://its.cern.ch/jira/projects/BIPXL

    • 14:20 → 15:00
      Topical presentation(s) & discussion 40m
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