Tracking for high multiplicity event (E05-115) & E01-011
GEANT4 simulation 14/Dec/2011 School of science, Tohoku University
Toshiyuki Gogami ( ) 8/May/2009, JLab Hall-C HKS-HES Collaboration
Meeting, T.Gogami1 Slide 2 Contents Tracking for high multiplicity
event E01-011 GEANT4 simulation HKS-HES Collaboration Meeting,
T.Gogami2 Slide 3 Tracking for high multiplicity event (JLab
E05-115) Splitter Magnet HKS HES HKS-HES Collaboration Meeting,
T.Gogami3 Slide 4 e, e + background in GEANT simulation Vacuum
chamber (sus304) NMR port (sus304) KDC1KDC2 e -, e + Generated
particle : e + Distribution : spherical uniform Momentum : 860 1000
[MeV/c] Angle : 0 2 [mrad] 1000 events 4 e+e+ HKS HKS-HES
Collaboration Meeting, T.Gogami Slide 5 Rates of the KDC Layers CH
2, 76314 KDC1 KDC2 ~3 MHz ~6 MHz HKS-HES Collaboration Meeting,
T.Gogami5 Slide 6 Rates of the KDC Layers H 2 O, 75971 KDC1 KDC2
~10 MHz ~20 MHz HKS-HES Collaboration Meeting, T.Gogami6 Slide 7
Rates of the KDC Layers 52 Cr, 76314 KDC1 KDC2 ~11 MHz ~22 MHz
HKS-HES Collaboration Meeting, T.Gogami7 Slide 8 Rates of the KDC
wires CH 2, 76314 Wire Number Rate [kHz] KDC1-u
KDC1-uKDC1-xKDC1-xKDC1-vKDC1-v KDC2-u
KDC2-uKDC2-xKDC2-xKDC2-vKDC2-v < 150 kHz < 120 kHz < 70
kHz < 60 kHz HKS-HES Collaboration Meeting, T.Gogami8 Slide 9
Rates of the KDC wires H 2 O, 75971 Wire Number Rate [kHz] KDC1-u
KDC1-uKDC1-xKDC1-xKDC1-vKDC1-v KDC2-u
KDC2-uKDC2-xKDC2-xKDC2-vKDC2-v < 450 kHz < 270 kHz < 250
kHz < 200 kHz HKS-HES Collaboration Meeting, T.Gogami9 Slide 10
Rates of the KDC wires 52 Cr, 77124 Wire Number Rate [kHz] KDC1-u
KDC1-uKDC1-xKDC1-xKDC1-vKDC1-v KDC2-u
KDC2-uKDC2-xKDC2-xKDC2-vKDC2-v < 510 kHz < 350 kHz < 290
kHz < 230 kHz HKS-HES Collaboration Meeting, T.Gogami10 Slide 11
Rates of the HKS TOF detectors HKS-HES Collaboration Meeting,
T.Gogami11 Slide 12 Multiplicity of typical layer of chamber HES
HKS ~1.13 ~1.28 ~2.24 ~4.94 HKS-HES Collaboration Meeting,
T.Gogami12 Slide 13 Discrepancy of Number of (Before new tracking
code adoption) Lost events that we are interested in in tracking
procedure. HKS-HES Collaboration Meeting, T.Gogami13 Black : hit
wires Blue : selected wires Red : track Black : hit wires Blue :
selected wires Red : track REAL DATA 00 00 CH 2 Target H 2 O Target
12 C quasi-free Acc. b.g. 16 O quasi-free Acc. b.g. Very
preliminary Slide 14 New tracking code Event display of new
tracking code HKS-HES Collaboration Meeting, T.Gogami14 Slide 15
Results of Introduction of new Tracking Code Increased ! CH 2 52 Cr
H2OH2O HKS-HES Collaboration Meeting, T.Gogami15 Slide 16 Events
which are discarded 52 Cr, 77124 KDC1 KDC2 HKS-HES Collaboration
Meeting, T.Gogami16 Slide 17 Events which are discarded 52 Cr,
77124 KDC1 KDC2 Where and why are these events discarded ? Are
these events threw away by correct cut condition? Where and why are
these events discarded ? Are these events threw away by correct cut
condition? HKS-HES Collaboration Meeting, T.Gogami17 Slide 18
Events which are discarded 52 Cr, 77124 KDC1 KDC2 Where and why are
these events discarded ? Are these events threw away by correct cut
condition? Where and why are these events discarded ? Are these
events threw away by correct cut condition? h_pattern_recognition.f
~10% up HKS-HES Collaboration Meeting, T.Gogami18 Slide 19 x-t
calibration for 52 Cr Target Residuals better KDC1 ; 400 [m] 300
[m] Number up ~10% increased at 2
