A modular silicon (vertex) digitizer, acting on pixel-level - #81

Draft

JonaDilg wants to merge 71 commits into

key4hep:mainfrom

JonaDilg:VTXdigi_Modular

Commits on Nov 28, 2025

VTXdigi: Create skeleton for revamped vertex digitiser, to include both the drifting approach by Jessy Daniel, and the lookup-table approach by Armin Ilg and Jona Dilg
JonaDilg
committed
b34d8db

Commits on Feb 3, 2026

VTXdigi: Fixing and clarifying VTXdigi_Modular::InitLayersAndSensors(). Implementing class VTXdigi_tools::PixelChargeMatrix()
JonaDilg
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760f179

Commits on Feb 4, 2026

VTXdigi: adding pixel- and binning-focused VTXdigi_tools. Implementing SensorChargeMatrix.
JonaDilg
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f88c86a

Commits on Feb 10, 2026

Commits on Feb 11, 2026

Commits on Feb 12, 2026

VTXdigi: implementing a HitMap based on std::unordered_map instead on std::vector<int> with an entry for every pixel. For small pixel occupancy O(0.001%) this is A LOT faster.
JonaDilg
committed
0062ff4

Commits on Feb 17, 2026

Commits on Feb 18, 2026

VTXdigi: Implementing DFS clustering algorithm. Implementing saving which simTrackerHits contribute to a cluster. Implementing creation of digiHits for clusters. This break outputting all pixelHits…
JonaDilg
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eb79f4d

Commits on Feb 20, 2026

VTXdigi: refactoring event loop for better readability
JonaDilg
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1b4052e

Commits on Feb 22, 2026

Commits on Feb 24, 2026

Commits on Feb 25, 2026

VTXdigi: convert from managed to raw pointers, ownership management is not needed
JonaDilg
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6f708d2

Commits on Feb 26, 2026

VTXdigi: Streamlining SimHitWrapper vs SimTrackerHit passing, cleanup and adding doxygen comments. Implementing a custom simHit truthPosition, to be defined by the ChargeCollection Algorithm
JonaDilg
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4d250c0

Commits on Feb 27, 2026

VTXdigi: Fixed shifting the truth-pos along the path. Added histograms (cluster-size vs global z; residual vs global z). Implementing thresholding, and charge and time smearing. Time smearing is cu…
JonaDilg
committed
34bc767

Commits on Mar 2, 2026

Commits on Mar 4, 2026

VTXdigi: adding counters. Cleaning up (mainly removing unnecessatry inclusions and moving functions to classes they should be a member of)
JonaDilg
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01b2131

Commits on Mar 31, 2026

VTXdigi: Path computation cleanup. Adding MANY histograms
JonaDilg
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a360c02

Commits on Apr 10, 2026

VTXdigi: More plots, minor fixes
JonaDilg
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17b08e7

Commits on Apr 15, 2026

VTXdigi: Small pre-PR fixes
JonaDilg
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1f39c70
VTXdigi: Work on readme. not fully done.
JonaDilg
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4a48153

Commits on Apr 17, 2026

Commits on May 7, 2026

Commits on May 26, 2026

Commits on May 27, 2026

Commits on May 28, 2026

VTXdigi: final fix to getting sensor dimensions from solid and sensitive surface
JonaDilg
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3718793

Commits on Jun 8, 2026

VTXdigi: Implementing reading ChargeCollectionDepthCenter from the LUT file, instead of Gaudi parameter
JonaDilg
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ceb44f5

Commits on Jun 24, 2026

VTXdigi: Debugging cluster size and residual. Not successful yet.
JonaDilg
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8928b1a

Commits on Jul 13, 2026

VTXdigi: Include diagonal neighbours in clusters (so far, only direct neighbours were used). Add threshold dispersion as individual parameter (on top of electronic noise), same as Allpix Squared
JonaDilg
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e1b5ec7

Commits on Jul 15, 2026

VTXdigi: implement grid traversal algo for LUT digitizer
JonaDilg
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422c2b0

Commits on Aug 4, 2026

cleaning up unused histograms, correct CausedByGeneratorMCParticle implementation, add seed pixel charge histogram
Jona Dilg
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dc2d34a

Commits on Aug 5, 2026

VTXdigi: revamp residuals. Now grouping simhits by their MCParticle type (primary / secondary / delta). with a single particle, residual_highestEParticleOnSensor reproduces the central region of re…
Jona Dilg
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9aaeed5

Commits on Aug 6, 2026

VTXdigi: implement correct secondary/delta check via MCParticle production vertex location.
Jona Dilg
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d55f789

Commits on Aug 7, 2026

Commits on Aug 12, 2026

VTXdigi: implementing eta distribution plot (cluster truth pos vs cluster CoG)
Jona Dilg
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0bdcad7
VTXdigi: moving from std::pair<T,T> to std::array<T,2> for u/v coordinates and indices
Jona Dilg
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a9e0038
VTXdigi: revamping Eta Distribution to implement the definition used in https://arxiv.org/pdf/2107.06600 instead of what I thought would be needed
Jona Dilg
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0766289

Commits on Aug 13, 2026

VTXdigi: Implement eta distribution. Revamped deriving it from the LUT, implemented applying it to the cluster CoG. Code runs slower than expected, quite likely something that can be improved easily
Jona Dilg
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5a3387d

Commits on Aug 17, 2026

Commits on Aug 18, 2026

VTXdigi: Updated Readme with Eta corr. Removed unneccessary condition that corrected values of eta distrib. need to be monotonically rising. Added residual plots for different cluster sizes
Jona Dilg
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df68ec1

Commits on Aug 20, 2026

VTXdigi: fix wrong EntryMinimu (was left wrong from testing)
Jona Dilg
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2cc8c4a
VTXdigi: Implemented a working test using upstream ALLEGRO o1_v03 and a custom dummy lookup table
Jona Dilg
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6dd2a9b

Commits on Aug 21, 2026

Commits on Aug 29, 2026

Commits on Aug 31, 2026