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.)