JeffersonLab/halld_recon
Dec 2024 – Mar 2026
13 Months active
Languages Used
C++
Technical Skills
Data ProcessingEvent ReconstructionC++C++ DevelopmentCalibrationCode Readability
Sean Dobbs
PROFILE
Sean Dobbs
Sean Dobbs developed and maintained core data processing and analysis infrastructure for the JeffersonLab/halld_recon repository over 13 months, delivering 37 features and 23 bug fixes. He engineered detector data pipelines, calibration routines, and monitoring tools using C++ and ROOT, focusing on reliability, configurability, and data integrity. His work included refactoring hit selection logic, implementing robust event reconstruction, and enhancing concurrency and error handling. By integrating new detectors, improving timing calibration, and streamlining data parsing, Sean enabled more accurate physics analyses and maintainable workflows. His contributions demonstrated depth in software engineering, data acquisition, and scientific computing within complex experimental environments.
Overall Statistics
Feature vs Bugs
62%Features
Repository Contributions
113Total
Bugs
23
Commits
113
Features
37
Lines of code
13,656
Activity Months13
Your Network
36 peopleShared Repositories
36
Alex AustregesiloMember
acschickMember
acschickMember
andrsmitMember
Bo YuMember
Mark DaltonMember
David LawrenceMember
dglazierMember
Niklas HerrmannMember
Work History
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for JeffersonLab/halld_recon. Focused on data quality improvements, clearer diagnostics, and maintainability to support reliable physics analysis. Delivered two major items: Beam Helicity Quality Control Enhancements with data correction and DEVIOWorkerThread error message clarifications. Result: higher data integrity, faster issue diagnosis, and stronger monitoring.
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for JeffersonLab/halld_recon. Focused on data quality improvements, clearer diagnostics, and maintainability to support reliable physics analysis. Delivered two major items: Beam Helicity Quality Control Enhancements with data correction and DEVIOWorkerThread error message clarifications. Result: higher data integrity, faster issue diagnosis, and stronger monitoring.
March 2026
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026: Delivered reliability and data integrity improvements in JeffersonLab/halld_recon. Key features delivered include robust data parsing resilience and fixes to CCDB storage handling, directly contributing to more robust data pipelines and lower downstream support costs. The work focused on incident-free data processing for critical datasets and maintaining consistent access to calibration data used across analyses.
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026: Delivered reliability and data integrity improvements in JeffersonLab/halld_recon. Key features delivered include robust data parsing resilience and fixes to CCDB storage handling, directly contributing to more robust data pipelines and lower downstream support costs. The work focused on incident-free data processing for critical datasets and maintaining consistent access to calibration data used across analyses.
January 2026
10 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for JeffersonLab/halld_recon: Delivered targeted calibration, timing, data processing, and diagnostics improvements that directly enhance data quality and workflow efficiency. Key work spanned BCAL TDC timing and maintenance, FDC data analysis and alignment enhancements, and diagnostics/debugging improvements, all aimed at streamlining calibration pipelines, improving analysis reliability, and accelerating physics insights.
10 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for JeffersonLab/halld_recon: Delivered targeted calibration, timing, data processing, and diagnostics improvements that directly enhance data quality and workflow efficiency. Key work spanned BCAL TDC timing and maintenance, FDC data analysis and alignment enhancements, and diagnostics/debugging improvements, all aimed at streamlining calibration pipelines, improving analysis reliability, and accelerating physics insights.
January 2026
November 2025
3 Commits • 2 Features
Nov 1, 2025November 2025 monthly summary for JeffersonLab/halld_recon. Key features delivered: 1) DTAG hit processing timing improvements through refactoring intermediate hit storage in DTAGH/DTAGM and explicit TDC time setting on DTAGMHit/DTAGHHit, reducing timing jitter and data filtering errors (commits a5deb3e58353cf836c0d3a16c9d1cdc11f36f466; 0864aeb238d154a18b7d71f0414f2151c94c0b62). 2) HDDM event writing enhancement to allow non-Calib tagger hits by defaulting tag values to empty strings, increasing tagging flexibility (commit 071a2f0a860773305ed3ebbe1771eef0a928ed12). Major bugs fixed: addressed timing data handling edge-cases and loosened tag filtering constraints to prevent unintended data loss in downstream analyses. Overall impact and accomplishments: improved data quality, timing accuracy, and tagging flexibility; downstream physics analyses more robust with less manual tuning and faster iteration. Technologies/skills demonstrated: C++ refactoring of hit storage, timing calibration for DTAGs, HDDM writer customization, and robust default handling for tagger hits.
November 2025
3 Commits • 2 Features
Nov 1, 2025November 2025 monthly summary for JeffersonLab/halld_recon. Key features delivered: 1) DTAG hit processing timing improvements through refactoring intermediate hit storage in DTAGH/DTAGM and explicit TDC time setting on DTAGMHit/DTAGHHit, reducing timing jitter and data filtering errors (commits a5deb3e58353cf836c0d3a16c9d1cdc11f36f466; 0864aeb238d154a18b7d71f0414f2151c94c0b62). 2) HDDM event writing enhancement to allow non-Calib tagger hits by defaulting tag values to empty strings, increasing tagging flexibility (commit 071a2f0a860773305ed3ebbe1771eef0a928ed12). Major bugs fixed: addressed timing data handling edge-cases and loosened tag filtering constraints to prevent unintended data loss in downstream analyses. Overall impact and accomplishments: improved data quality, timing accuracy, and tagging flexibility; downstream physics analyses more robust with less manual tuning and faster iteration. Technologies/skills demonstrated: C++ refactoring of hit storage, timing calibration for DTAGs, HDDM writer customization, and robust default handling for tagger hits.
August 2025
3 Commits • 1 Features
Aug 1, 2025Concise monthly summary for 2025-08 focusing on JeffersonLab/halld_recon. Delivered reliability improvements in detector geometry handling and REST data loading, addressed maintainability issues, and reinforced data robustness. These changes reduce spurious error messages and ensure correct beam helicity loading, delivering measurable business value and technical gains.
3 Commits • 1 Features
Aug 1, 2025Concise monthly summary for 2025-08 focusing on JeffersonLab/halld_recon. Delivered reliability improvements in detector geometry handling and REST data loading, addressed maintainability issues, and reinforced data robustness. These changes reduce spurious error messages and ensure correct beam helicity loading, delivering measurable business value and technical gains.
August 2025
July 2025
3 Commits • 1 Features
Jul 1, 2025Summary for 2025-07: Delivered reliability and correctness enhancements in JeffersonLab/halld_recon, focusing on helicity data integrity, robustness to missing ECAL geometry, and ECAL trigger skim accuracy. These changes improve data quality, processing stability, and cross-configuration support (including pre-FCAL2), enabling more accurate physics analyses and smoother pipelines. Tech stack and practices highlighted include C++ code quality, data validation, guarded analysis paths, and precise bitmask handling.
July 2025
3 Commits • 1 Features
Jul 1, 2025Summary for 2025-07: Delivered reliability and correctness enhancements in JeffersonLab/halld_recon, focusing on helicity data integrity, robustness to missing ECAL geometry, and ECAL trigger skim accuracy. These changes improve data quality, processing stability, and cross-configuration support (including pre-FCAL2), enabling more accurate physics analyses and smoother pipelines. Tech stack and practices highlighted include C++ code quality, data validation, guarded analysis paths, and precise bitmask handling.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for JeffersonLab work: Delivered ECAL LED Trigger and Skim Enhancements in the halld_recon repository. The update adds ECAL LED handling to the trigger skim pathway and modifies JEventProcessor_trigger_skims.cc to introduce new variables and parameters, enabling correct identification and processing of ECAL LED events within the existing skim framework. This work improves data quality for ECAL LED runs and supports more efficient downstream analysis.
1 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for JeffersonLab work: Delivered ECAL LED Trigger and Skim Enhancements in the halld_recon repository. The update adds ECAL LED handling to the trigger skim pathway and modifies JEventProcessor_trigger_skims.cc to introduce new variables and parameters, enabling correct identification and processing of ECAL LED events within the existing skim framework. This work improves data quality for ECAL LED runs and supports more efficient downstream analysis.
June 2025
May 2025
14 Commits • 6 Features
May 1, 2025May 2025 monthly summary for JeffersonLab/halld_recon focusing on expanding detector coverage, improving data processing robustness, and enabling broader compatibility across analysis and data-writing workflows. Key outcomes include ECAL integration into the analysis library with updated histograms and kinematic calculations; FCAL2 channel support and related histograms; improved TOF/CAEN data handling; EVIO writer updates for JANA2 compatibility; helicity and beam data processing enhancements; and thread-safety improvements for trigger initialization, RCDB data loading, and file locking. These efforts deliver measurable business value by increasing analysis coverage, improving data quality and reproducibility, and enabling more scalable, maintainable workflows across detector components.
May 2025
14 Commits • 6 Features
May 1, 2025May 2025 monthly summary for JeffersonLab/halld_recon focusing on expanding detector coverage, improving data processing robustness, and enabling broader compatibility across analysis and data-writing workflows. Key outcomes include ECAL integration into the analysis library with updated histograms and kinematic calculations; FCAL2 channel support and related histograms; improved TOF/CAEN data handling; EVIO writer updates for JANA2 compatibility; helicity and beam data processing enhancements; and thread-safety improvements for trigger initialization, RCDB data loading, and file locking. These efforts deliver measurable business value by increasing analysis coverage, improving data quality and reproducibility, and enabling more scalable, maintainable workflows across detector components.
April 2025
20 Commits • 7 Features
Apr 1, 2025April 2025 milestones for JeffersonLab/halld_recon focused on strengthening data quality, reliability, and online monitoring capabilities while expanding ECAL-related timing studies. Key work included robust helicity data handling with configurable parsing, improved error reporting, and prioritized prompt helicity data; initial ECAL timing support integrated into HLDetectorTiming; HLDT plotting extended to incorporate ECAL data; DPSCHit support and updated timing setpoints enhanced online monitoring; and stability/data-quality improvements across IO and event processing with targeted fixes and format support.
20 Commits • 7 Features
Apr 1, 2025April 2025 milestones for JeffersonLab/halld_recon focused on strengthening data quality, reliability, and online monitoring capabilities while expanding ECAL-related timing studies. Key work included robust helicity data handling with configurable parsing, improved error reporting, and prioritized prompt helicity data; initial ECAL timing support integrated into HLDetectorTiming; HLDT plotting extended to incorporate ECAL data; DPSCHit support and updated timing setpoints enhanced online monitoring; and stability/data-quality improvements across IO and event processing with targeted fixes and format support.
April 2025
March 2025
29 Commits • 7 Features
Mar 1, 2025March 2025 – halld_recon monthly summary for Jefferson Lab. Focused on delivering core functionality, stabilizing runtime, and enabling run-dependent configurability. Key features delivered: - Hit selection logic refactor to align with other detectors (commit 6db27e225f3c47ab3df2a86268809063bcc743dd). - TRD hit factories implementation completed (commit 3dce364bcc515655a0de130fe41ad87f1af3046b). - FCAL pi0 plugins optionally built (commit 92dbc84f732c44f900f989cf6a4e88fd2936e202). - Locking improvements and robustness: finer-grained locking, fixed missed locks, and addressing BEAM_online plugin locking (commits de2ce38eb9ef183ba58693b8948039f78dac4622; 2fcd190e03c8139bd9bc56fdaaedb00897f18ede; 49818936b61e986fc3d276fd976dcd10c14f1424). - Detector configuration and optional loading controls via CCDB: control detectors used in run periods and make TRD optional; allow conditional loading (commits 5ed31020c2359136148a0737fe7e54f048e478de; ac35ea180d0410eeb2200d8d23fe4c1214a6efe9; 00e34ab891ed4c5cbc54bffbc0b9c9715c4ab703). Major bugs fixed: - PSPair_online fix; Point factory and geometry z-shift cleanup; missed change fix; removal of debugging printouts; additional bug fixes; warnings resolution; compiler warnings cleanup; HDDM writer cleanup; online high-level monitoring plugin update; general stability fixes across the batch; HELI_online verbosity handling and warnings cleanup; beam helicity logic updates; DEventWriterROOT crash fixes (commits 016605ef4e6c54cbf4c8b6f66973f1df87699f88; ba8eed4192e5e114e3717a75987781cda2cc19dd; bdc753ec5183c713ee618b896d52231e6c10ba14; 4d970fdb781a8e2989cd206b7fa8e90600525615; 7750fa5beee76a0dc196704e21ce2d17ba8ef26a; 27f721cb937816b1dbfd2e1cbb03d13b21141f1a; d10547a921896b93b375d280f4fe727908bed3b6; dd6eb09cc66a951dc607d0d79aef23d5ace86333; 3673ccb25f440525777b5d781db113dcdb253c46; 74ff3e6b7efd4fdb54bc9acb6ede880f9a996023; 02d5a4bcd61e4e0cdb3e7b96f6c86de2e84c60f1; 4d4c9250e29ac334494e11d3c6a4b99312d778f1; c7b1643bff1d6f8c1df81c52eac89c20421b0122; 24f712f749190225de7f72e8275120fd1f3155ff; a48c3bae76ebf6ed741efa68349b09b8bffb57a4; fe43883943da90b67c34587ed509fda9f98a2b51; 23aecbe9bed4a063c6b30079a55df9aaabb03201; 7bbe7fa44798c850ea969af53467ee3bb933e050; 76b3986784e69c643708b57183fbabcb52c24b5b; cb74473bb2153ed91ea7aeb9b533816b8dba9746). Overall impact and accomplishments: - Increased stability, configurability for run-period detector usage, reduced build/runtime risk, and clearer maintenance path. Improved observability via updated monitoring plugin. Technologies/skills demonstrated: - Refactoring and modularization; concurrency and locking strategies; CCDB integration and run-period controls; optional plugin build management; detector reconstruction pipelines (TRD, FCAL); debugging and stability optimization; code hygiene and maintainability.
March 2025
29 Commits • 7 Features
Mar 1, 2025March 2025 – halld_recon monthly summary for Jefferson Lab. Focused on delivering core functionality, stabilizing runtime, and enabling run-dependent configurability. Key features delivered: - Hit selection logic refactor to align with other detectors (commit 6db27e225f3c47ab3df2a86268809063bcc743dd). - TRD hit factories implementation completed (commit 3dce364bcc515655a0de130fe41ad87f1af3046b). - FCAL pi0 plugins optionally built (commit 92dbc84f732c44f900f989cf6a4e88fd2936e202). - Locking improvements and robustness: finer-grained locking, fixed missed locks, and addressing BEAM_online plugin locking (commits de2ce38eb9ef183ba58693b8948039f78dac4622; 2fcd190e03c8139bd9bc56fdaaedb00897f18ede; 49818936b61e986fc3d276fd976dcd10c14f1424). - Detector configuration and optional loading controls via CCDB: control detectors used in run periods and make TRD optional; allow conditional loading (commits 5ed31020c2359136148a0737fe7e54f048e478de; ac35ea180d0410eeb2200d8d23fe4c1214a6efe9; 00e34ab891ed4c5cbc54bffbc0b9c9715c4ab703). Major bugs fixed: - PSPair_online fix; Point factory and geometry z-shift cleanup; missed change fix; removal of debugging printouts; additional bug fixes; warnings resolution; compiler warnings cleanup; HDDM writer cleanup; online high-level monitoring plugin update; general stability fixes across the batch; HELI_online verbosity handling and warnings cleanup; beam helicity logic updates; DEventWriterROOT crash fixes (commits 016605ef4e6c54cbf4c8b6f66973f1df87699f88; ba8eed4192e5e114e3717a75987781cda2cc19dd; bdc753ec5183c713ee618b896d52231e6c10ba14; 4d970fdb781a8e2989cd206b7fa8e90600525615; 7750fa5beee76a0dc196704e21ce2d17ba8ef26a; 27f721cb937816b1dbfd2e1cbb03d13b21141f1a; d10547a921896b93b375d280f4fe727908bed3b6; dd6eb09cc66a951dc607d0d79aef23d5ace86333; 3673ccb25f440525777b5d781db113dcdb253c46; 74ff3e6b7efd4fdb54bc9acb6ede880f9a996023; 02d5a4bcd61e4e0cdb3e7b96f6c86de2e84c60f1; 4d4c9250e29ac334494e11d3c6a4b99312d778f1; c7b1643bff1d6f8c1df81c52eac89c20421b0122; 24f712f749190225de7f72e8275120fd1f3155ff; a48c3bae76ebf6ed741efa68349b09b8bffb57a4; fe43883943da90b67c34587ed509fda9f98a2b51; 23aecbe9bed4a063c6b30079a55df9aaabb03201; 7bbe7fa44798c850ea969af53467ee3bb933e050; 76b3986784e69c643708b57183fbabcb52c24b5b; cb74473bb2153ed91ea7aeb9b533816b8dba9746). Overall impact and accomplishments: - Increased stability, configurability for run-period detector usage, reduced build/runtime risk, and clearer maintenance path. Improved observability via updated monitoring plugin. Technologies/skills demonstrated: - Refactoring and modularization; concurrency and locking strategies; CCDB integration and run-period controls; optional plugin build management; detector reconstruction pipelines (TRD, FCAL); debugging and stability optimization; code hygiene and maintainability.
February 2025
11 Commits • 3 Features
Feb 1, 2025February 2025 accomplishments for JeffersonLab/halld_recon focused on delivering end-to-end helicity data processing, improving TRD data handling, and tightening data quality with firmware filtering and EVIO debugging. The work established robust data paths for helicity, enhanced TRD clustering, and fixed critical EVIO issues, enabling higher reliability and faster downstream analyses.
11 Commits • 3 Features
Feb 1, 2025February 2025 accomplishments for JeffersonLab/halld_recon focused on delivering end-to-end helicity data processing, improving TRD data handling, and tightening data quality with firmware filtering and EVIO debugging. The work established robust data paths for helicity, enhanced TRD clustering, and fixed critical EVIO issues, enabling higher reliability and faster downstream analyses.
February 2025
January 2025
13 Commits • 4 Features
Jan 1, 2025January 2025 (2025-01) delivered end-to-end TRD data reconstruction enhancements within JeffersonLab/halld_recon, including TRD hit construction, calibration loading, time/amplitude scaling, configurable time cuts, and TRD track segment integration with geometry notes. Introduced a Track Matching analysis plugin for TRD/FCAL with histograms for track extrapolations and E/p for FCAL showers. Improved TRD online monitoring and high-level visualization (DTRDSegment factory, histogram reorganization, and label improvements). Performed targeted code cleanup by removing legacy DGEM objects and related prototypes. These efforts increase reconstruction accuracy, data-driven calibration, observability, and maintainability, delivering clear business value for physics analyses.
January 2025
13 Commits • 4 Features
Jan 1, 2025January 2025 (2025-01) delivered end-to-end TRD data reconstruction enhancements within JeffersonLab/halld_recon, including TRD hit construction, calibration loading, time/amplitude scaling, configurable time cuts, and TRD track segment integration with geometry notes. Introduced a Track Matching analysis plugin for TRD/FCAL with histograms for track extrapolations and E/p for FCAL showers. Improved TRD online monitoring and high-level visualization (DTRDSegment factory, histogram reorganization, and label improvements). Performed targeted code cleanup by removing legacy DGEM objects and related prototypes. These efforts increase reconstruction accuracy, data-driven calibration, observability, and maintainability, delivering clear business value for physics analyses.
December 2024
1 Commits
Dec 1, 2024December 2024 monthly summary for JeffersonLab/halld_recon focusing on business value and technical accomplishments. The month centered on a critical bug fix to ensure data integrity in FMWPC hit data handling within the DEventWriterHDDM component, strengthening the reconstruction data pipeline.
1 Commits
Dec 1, 2024December 2024 monthly summary for JeffersonLab/halld_recon focusing on business value and technical accomplishments. The month centered on a critical bug fix to ensure data integrity in FMWPC hit data handling within the DEventWriterHDDM component, strengthening the reconstruction data pipeline.
December 2024
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Quality Metrics
Correctness85.4%
Maintainability85.4%
Architecture80.4%
Performance74.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
Algorithm ImplementationAlgorithm RefinementBit ManipulationBug FixBug FixingBuild System ConfigurationC++C++ DevelopmentC++ developmentC++ programmingCCDB IntegrationCalibrationCode CleanupCode DocumentationCode Readability
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