Thomas Jefferson National Accelerator Facility Page 1 CLAS12 Workshop Jefferson Lab February 23, 2016 Time-of-Flight Software Status Jerry Gilfoyle, Evgeny.

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Presentation transcript:

Thomas Jefferson National Accelerator Facility Page 1 CLAS12 Workshop Jefferson Lab February 23, 2016 Time-of-Flight Software Status Jerry Gilfoyle, Evgeny Golovach, Dan Carman, Veronique Ziegler, Gagik Gavalian Outline: Motivation Time-of-Flight subsystem Status Validation results Timing resolution Summary

Thomas Jefferson National Accelerator Facility Page 2 TOF Reconstruction page 3  Outputs o Times (T L, T R from TDCs) o Positions (x cluster =v eff (T L – T R )/2, y cluster depends on cluster size) o Hit times (T hit from (T L + T R )/2) o Deposited energy (E dep from ADCs)

Thomas Jefferson National Accelerator Facility Page 3 TOF Reconstruction page 2  Forward Time-of-Flight (FTOF) o 6 sectors, double-sided PMT readout. o Paddles:  Panel 1a - 23, 15-cm wide, ps timing requirement.  Panel 1b - 62, 6-cm wide, ps timing requirement.  Panel 2 – 5, 15-cm wide, ps timing requirement.  Central Time-of-Flight (CTOF) o 48 paddles, double-sided PMT readout. o form hermetic barrel around target. o 60-ps timing resolution requirement.

Thomas Jefferson National Accelerator Facility Page 4 FTOF Software Status First version of standalone TOF reconstruction code (CLAS-NOTE ) ported to coatjava. Results of DC reconstruction used to extrapolate track to FTOF panels. Geometry obtained from Java package for FTOF reconstruction and gemc. Updated to latest versions of Common Tools. Part of upcoming Common Tools 2.5 release. Validation studies on going (results below).

Thomas Jefferson National Accelerator Facility Page 5 FTOF Software Validation Studies JLab software v1.2gemc v2.2 coatjava 2.0Single paddle hits. Event generators – uniform distributions

Thomas Jefferson National Accelerator Facility Page 6 Position Studies- 1 1A 1B 2 Magnetic fields set to zero. Panel widths: 1A – 15 cm 1B – 6 cm 2 – 22cm Panels show increase in width expected for current digitization in gemc. Geometry used in coatjava 2.0 from same database used by gemc.

Thomas Jefferson National Accelerator Facility Page 7 Position Studies- 2 1A 1B 2 Magnetic fields set to zero. Panel widths: 1A – 15 cm 1B – 6 cm 2 – 22 cm Widths reflect geometry of each paddle. Spike in panel 2 and a wee bit in panel 1b likely due to hit in neighboring counter. Under investigation.

Thomas Jefferson National Accelerator Facility Page 8 Deposited Energy and ADCs 1A 1B Magnetic fields set to zero. Panel thickness: 1A – 5 cm 1B – 6 cm 2 – 5 cm Position of E dep peak consistent with past measured response and thickness of the paddle.

Thomas Jefferson National Accelerator Facility Page 9 Timing 1A 1B 2 Required timing resolution is in the range ps for combined panels 1a and 1b. Timing resolutions Panel 1a: ps Panel 1b: ps Panel 2: ps. TDC digitization in gemc needs to be made more realistic.

Thomas Jefferson National Accelerator Facility Page 10 Time Resolution - 1

Thomas Jefferson National Accelerator Facility Page 11 Time Resolution - 2

Thomas Jefferson National Accelerator Facility Page 12 Time Resolution - 3

Thomas Jefferson National Accelerator Facility Page 13 Summary GEMC page 4 1.Standalone TOF reconstruction software updated and in coatjava Matching between DC track and FTOF hits done. 3.Reading ccdb database for calibration constants. 4.Validation studies ongoing. 5.Timing resolution studies starting.