Difference between revisions of "LB RunGroupC Vertex"
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|| Generated Vz (cm) || [[File:05ZTarg GenPartz.png|200px]] || [[File:1cmZTarg GenPartz.png|200px]] || ** || [[File:3cmZTarg GenPartz.png|200px]] || [[File:4cmZTarg GenPartz.png|200px]] || [[File:5cmZTarg GenPartz.png|200px]] || | || Generated Vz (cm) || [[File:05ZTarg GenPartz.png|200px]] || [[File:1cmZTarg GenPartz.png|200px]] || ** || [[File:3cmZTarg GenPartz.png|200px]] || [[File:4cmZTarg GenPartz.png|200px]] || [[File:5cmZTarg GenPartz.png|200px]] || | ||
|- | |- | ||
− | || Reconstructed Vx (cm) || [[File:0.5ZTarg Eventx.png|200px]] || [[File:1cmZTarg Eventx.png|200px]] || ** || [[File:3cmZTarg Eventx.png|200px]] || [[File:4cmZTarg Eventx.png|200px]] || | + | || Reconstructed Vx (cm) || [[File:0.5ZTarg Eventx.png|200px]] || [[File:1cmZTarg Eventx.png|200px]] || ** || [[File:3cmZTarg Eventx.png|200px]] || [[File:4cmZTarg Eventx.png|200px]] || [[File:5cmZTarg Eventx.png|200px]] || |
|- | |- | ||
|| Reconstructed Vy (cm) || [[File:0.5ZTarg Eventy.png|200px]] || [[File:1cmZTarg Eventy.png|200px]] || ** || [[File:3cmZTarg Eventy.png|200px]] || [[File:4cmZTarg Eventy.png|200px]] || | || Reconstructed Vy (cm) || [[File:0.5ZTarg Eventy.png|200px]] || [[File:1cmZTarg Eventy.png|200px]] || ** || [[File:3cmZTarg Eventy.png|200px]] || [[File:4cmZTarg Eventy.png|200px]] || |
Revision as of 18:45, 25 July 2016
Vertex Reconstruction studies
Inclusive electron GEMC 2.4 & Coatjava 2.4
Summary
Set all histogram ranges to -6,6 cm and bin sizes of 0.1 cm
Point target X,Y,Z=0 cm
No Rastering | |
---|---|
Vx Difference | ![]() |
Vy Difference | ![]() |
Vz Difference | ![]() |
X Resolution (cm) | 0.2362 |
Y Resolution(cm) | 0.09809 |
Z Resolution (cm) | 0.05435 |
These histograms raise some questions. To begin I created a LUND file with 6 GeV incident electrons at 25 degrees in theta and 0 degrees in phi. All of the vertex positions were set to 0. I then ran GEMC 2.4 using the command line ~/src/CLAS/GEMC/source/gemc -USE_GUI=0 -INPUT_GEN_FILE="LUND,No_Raster.LUND" -N=75000 eg12_sol_No_Raster.gcard
which created an output file called eg12_sol_75k_No_Raster.ev. After that the reconstruction command line used was
~/src/CLAS/coatjava-2.4/bin/clas12-reconstruction -i eg12_sol_75k_No_Raster.ev-config GEOM::new=true -config MAG::torus=-1.0 -config MAG::solenoid=1.0 -o eg12_sol_75k_No_Raster_rec.evio -s DCHB:DCTB:EC:FTOF:EB -config DATA::mc=true -config DCTB::useRaster=true
After the reconstruction a root file was created using
~/src/CLAS/evio2root/bin/evio2root eg12_sol_75k_No_Raster_rec.evio eg12_sol_75k_No_Raster_rec.root 75000
A plot was then created to show the X Vertex and Y Vertex Differences
The first question is why is there a shift in the Y Difference. What would make X more centered around 0? The next question is when rastering begins, why do the resolutions in the X Vertices remain unchanged while the resolutions in the Y Vertices change?
Point in 2-D but extended target in 1-D
Two vertex variables are fixed at zero and the third vertex variable is altered
Extended target -3 < Z < 3 cm
Extended target in Z. Vy shift analysis
All Histograms below were created by simply making the target longer along the Z axis. Each case uses vertex points for X and Y ranging from -1cm to 1cm
Elastic electron proton GEMC 2.4 & Coatjava 2.4
References
https://clasweb.jlab.org/wiki/index.php/TF_EG12_Vertex#Z_resolution_With_micro-megas