status of geant4 (svd + pxd)
DESCRIPTION
Status of Geant4 (svd + pxd). Kibayashi May 30, 2007 For SVD Soft Meeting. What we have now Modules. Recap (already existing g4superb- *** ) kernel : to control the detectors, define physics & particles, generator interface, event action io : input/output managers, supports PANTHER - PowerPoint PPT PresentationTRANSCRIPT
Status of Geant4(svd + pxd)
A. KibayashiMay 30, 2007
For SVD Soft Meeting
What we have nowModules
• Recap (already existing g4superb-***)– kernel : to control the detectors, define physics & particles, generator interface, e
vent action– io : input/output managers, supports PANTHER– svd, cdc, top, rich, ecl(module exists but doesn’t work?), klm, kekb, solenoid
Need to revisit and summarize what’s done & what’s to be done (by next March) in each sub-detector.
• Added– pxd for pixel detector w/ beam pipe– Ir reserved for IR region (to be combined with kekb?)
• Report here mainly on svd and pxd…
• Your wisdom and inputs highly appreciated!
Geometry : Mother VolumeRed lines indicate Mother Volume, reserved volume for each sub-detectors (units in mm)Both SVD and PXD sit w/i their Mother Volumes
(700,150)(-500,150)
(-500,80) (-90,12) (130,12)(700,80)
x
y
PXD : geometry(b20070528)
beam trapezoid(fwd) (Be)
beam trapezoid (bwd)(7x1.15)x2
(50x50)x2
(50x50)x2
350x2
500x2*all units in mm
Central super-flat beam pipe (Be) (7x1x25)x2
Vacuum inside beam pipe (5x0.5x25)x2
2 Silicon PXD detectors (Si) (7x0.15x25)x2 Placed upper & lower of the SFBP
ToDo : beam trapezoid is currently solid Be, need vacuum inside…
PXD : Hits
y
zx
Upper pxd = Sensor 0
Lower pxd = Sensor 1
Cell ID x0 …
349
Cell ID z 0 … 2499
2499 … 0 Cell ID z
Cell ID x0 …
349
1Pixel size = 20 m x 20 m
- Local position/global position determined by (in_pos+out_pos)/2.- Hit cell ID determined by the local position (x, z).
SVD : geometryby Tajima-san
1st layer 2nd layer
3rd layer4th layer
5th layer 6th layer
- Same Geometry as in LoI.- note: one DSSD/ladder
PXD : panther table
• DATPXD_TRUEHIT – sensor : ID upper(0) or lower(1) – track : ID – dir : outwards(0) or inwards(1)– elec : no. of electrons = total energy deposit/3.6 eV– gpos(3) : global position– lpos(3) : local position
needs smearing by Gaussian– cell(2) : cell ID in (x, z)
SVD : GeometryB4SVD_Geometry.dat
1 2 3 4 5a 5b 6a 6b s5a s5b S6a s6b
nDSSD 12 12 12 12 12 12 12 12 12 12 12 12
width 8.5 10.0 28.4 40.0 28.4 28.4 40.0 40.0 28.4 28.4 40.0 40.0
swidth 19.9 19.9 28.0 28.0
Length 71.0 84.0 240.0 380.0 400.0 400.0 456.0 456.0 80.0 80.0 144.0 144.0
minR 13.0 16.0 45.0 70.0 100.0 103.0 137.0 140.0 89.0 92.0 117.5 120.5
shift 0.72 0.7 0.7 0.7 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
phi_offset 0.0 0.0 0.0 0.0 0.0 0.5 0.0 0.5 0.0 0.5 0.0 0.5
z_offset 0.0 0.0 0.0 0.0 -20.0 -10.0 -10.0 0.0 205.0 210.0 205.0 210.0
peripheral 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
theta 1.0 1.0 1.0 1.0
Slanted DSSDs trapezoid shapes.
Swidth/2
Width/2Length/2
- all units in mm, rad- dssd thickness = 0.3 for all DSSDs- peripheral means outside of sensitive region, width + peripheral=> width of the DSSD- shift: % of width off from x=0- phi_offset = % of phi shifts from a to b
SVD : panther tableby KHara-san
• REDSVD3_CLUSTER– Sensor : sensor (DSSD) ID– Type : p or n (1 or 0)– Width : currently 0– Elec : no. of electrons = total Edep/3.6 eV– Eren : currently 0– Pos : local cluster position smeared by incident angle dependent sigma (obsolet
e, from old Kawasaki-san’s beam test result)– Erpos : error on position
• DATSVD3_TRUEHIT– Sensor : DSSD number– Track : track ID number– Dir : direction of the track, outward (0) or inward (1)– Elec : no. of electrons = total Edep/3.6 eV– Gpos(3) : global truehit position– Lpos(3) : local truehit position– Hep :
Summary
• Done– Added g4superb-pxd – g4superb-cdc and trasan implemented by Katayama-san
• Helix parameters are available
• ToDo Next– Implement TRAK
• Geant4– Start w/ current SVD geometry, 4 layers w/o slanted DSSD, assume 1D
SSD/ladder
• TRAK– Readout from local position not lsa
– Cross-check with TRAKERR
Test SVD2 geometry
layer 1 2 3 4
nDSSD 6 12 18 18
width 28.4 28.4 28.4 28.4
length 153 260 386 454
minR 20 44 70 88
z_offset length/2-52
24.5
length/2-80
50
length/2-124
69
length/2-157
70
peripheral 1 1 1 1
(Units in mm.)