DC monitoring - calibration - simulation - corrections

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Presentation transcript:

DC monitoring - calibration - simulation - corrections Monitoring (Olga Cortes, Michael Kunkel, Latiful Kabir) Standard plots, exploratory package (ntuple) Calibration (Krishna Adhikari, MK, LK) Fit time as function of (doca, beta, B, local angle) Write calibration constants to CCDB Same function used for reconstruction and simulation Simulation Distance to time (KA, Daniel Lersch) non-linear function, time walk correction, random walk smearing Efficiency (DL, Michael Kunkel) intrinsic inefficiency, background inefficiency, malfunction-related inefficiency Corrections (No one yet! ) Time-of-flight, signal propagation, alignment, wire sag, endplate bowing Torus Mapping (Joseph Newton) Compare sector to sector, measurement to model Fit to individual misplacement, distortion 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC monitoring: ‘standard plots’ done Occupancy : dead areas DOCA vs. time Time Differences - spike at zero  coherent noise 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC distance  time calibration non-linear fit of time as function of doca, local angle, B-field numerically inverted to obtain time  distance tables for 2 angular bins; 5 bins of B-field strength Distance (cm) Time (ns) Region 1 Region 3 Region 2 B=2T B=1T B=0T local angle = 00 local angle = 300 inflection point Distance  Time -local-angle and B-field dependence Reconstruct write out track banks cut on beta, angle, B-field fit time, DOCA histogram write constants to CCDB Iterate Distance (cm) “Factory setting” 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC distance  time calibration First find “t0” Find t0 for each of 1512 signal cables (252 from sector 2) 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC distance  time calibration Calibration GUI in operation select events select local angle select range of fit fix or free paramers script to write to CCDB Tune parameters Different DT functions polynomial ? exponential? Which parameters to fix? Iteration not improving resolution 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC distance  time calibration Fits work pretty well 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC Calibration - Residuals Comparison Superlayer = 1 σ = 0.055 cm Superlayer = 5 σ = 0.044 cm Before Calibration cm Superlayer = 1 σ = 0.036 cm Superlayer = 5 σ = 0.037 cm After Calibration

DC simulation: distance  time; time smearing; efficiency Simulate distance  time (including smearing) non-linear distance to time function (SAME as for calibration) time-walk (beta-dependent) time smearing random walk smearing Simulate wire-hit efficiency intrinsic efficiency (distance dependent) malfunction related (run dependent) malfunction table in MySQL (date, wire-list, statchange) translation table (equipment  wire)  run-dependent wire status table in CCDB background related on-track (handled by GEMC) out of time (need to merge events) 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC simulation: efficiency Simulate malfunction-related inefficiencies 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC Readiness for First Experiment Mac Mestayer DC Corrections Time corrections time of flight (with and without particle id.) signal propagation time along wire Alignment ‘straight-track’ runs Distortions endplate bowing wire sagging Parameterizations known  implementation & testing 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC Readiness for First Experiment Mac Mestayer Torus Field Mapping  Midplane B-fields Vary by ~ 1/2% Sector to Sector 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC Readiness for First Experiment Mac Mestayer Torus Field Mapping Torus field mapping measure field at selected points compare to calculation calculation 2% low at 46.5 cm calculation 5% low at 30 cm  Coil radius off by 1cm in calculation ?? 2% 5% 6/13/2017 DC Readiness for First Experiment Mac Mestayer

DC monitoring - calibration - simulation - corrections standard plots done, developing ntuple, summary strip charts Calibration code written, fine-tuning procedures Simulation t  d: code written, adjusting parameters to match data malfunctions: GUI written, working on procedures Corrections time, geometry corrections to be done in summer Torus Mapping sector to sector variation ~ 0.5%; ready to fit Credit to Idaho St., Mississippi St., Juelich Inst., ODU Follow us at dc_team on Slack 6/13/2017 DC Readiness for First Experiment Mac Mestayer