Tungsten-Silicon Luminosity Detector with Flat Geometry

Tungsten-Silicon Luminosity

Detector with Flat Geometry

Ronen Ingbir

Tel Aviv University High Energy Physics Experimental Group Tel Aviv University High Energy Physics Experimental Group

Detector Design

0.34 cm Tungsten

0.31 cm Silicon

Cell Size

1cm*1cm

1 Radiation length

1 Radius Moliere


15 cylinders * 24 sectors * 30 rings = 10800 cells

Tel Aviv University High Energy Physics Experimental Group

Detector placement


3.05 m

8 cm

28 cm


Shower position Readout

Cylinders position (cm) Rings position (cm) Sectors position (deg)


250 GeV

Bhabha Scattering


BHWIDE MC Simulation

e

e+


Bhabha MC output


Photon Number

Photon Energy (GeV)

Positron Energy (GeV)

Electron Energy (GeV)

Mean = 2.3

250 GeV


Detector Simulation


Barbie -Geant 3.21 which includes detector description for Tesla

detector

The MC of physical process is the output of bhabha scattering

The Barbie program was given us by

Leszek Suszycki


100 GeV

250 GeV

Mean 312.9

Mean 312.5

Z rec (cm)

Z rec (cm)

Mean 313.2

400 GeV

Shower Z profile

Z rec (cm)


Detector Energy Readout


100 GeV

250GeV

400 GeV

Cut = Beam Energy * 0.014


Energy Resolution & Calibration


EE %40

Beam energy = 62.32 * Detector Energy + 0.36


Angular weighting


i

ii

E

EXX

i

ii

W

WXX

)]}ln([,0max{T

ii E

EconstW

Rec - Gen (rad) Rec - Gen(deg) Mean 0.2961E-03

Sigma 0.5809E-03

Mean –0.2361

Sigma 3.240

Mean 0.0975E-04

Sigma 0.2167E-03

Mean –0.7009

Sigma 1.917

250 GeV


Angular Resolution

0.2E-03

0.035

)(

)(


Acceptance with old geometry


Acceptance >30mrad


Cuts with New Geometry and bhabha MC


En

ergy

(G

ev)

En

ergy

(G

ev)

250 GeV

No cuts energy and angle cuts

gen (rad)

rec (rad)

gen (rad)

rec (rad)


New Acceptance

28 mrad


Rec - Gen

Rec

Gen

Gen (rad)

Rec

(ra

d)


Detector depth



Optimization


Num. Cylinders

14

28

56


Background studies


we included in the BHWIDE a background simulation routine called CIRCE. This was suggested to us by K. Moning


Background-1

1%


Background-2


Num Photons =1.9

1%

3%


Background-3


Pos(rad)

Ele(rad)

Pos(rad)

Ele(rad)


Background-4

Next Steps..…

A. Analyses of detector + background MCB. Cross checks in Geant 4C. Energy and Angular resolution improvement.


Tungsten-Silicon Luminosity Detector with Flat Geometry

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