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

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

15 cylinders * 24 sectors * 30 rings = 10800 cells

Tel Aviv University High Energy Physics Experimental Group

Detector placement

Tel Aviv University High Energy Physics Experimental Group

3.05 m

8 cm

28 cm

Tel Aviv University High Energy Physics Experimental Group

Shower position Readout

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

Tel Aviv University High Energy Physics Experimental Group

250 GeV

Bhabha Scattering

Tel Aviv University High Energy Physics Experimental Group

BHWIDE MC Simulation

e

e+

Tel Aviv University High Energy Physics Experimental Group

Bhabha MC output

Tel Aviv University High Energy Physics Experimental Group

Photon Number

Photon Energy (GeV)

Positron Energy (GeV)

Electron Energy (GeV)

Mean = 2.3

250 GeV

Tel Aviv University High Energy Physics Experimental Group

Detector Simulation

Tel Aviv University High Energy Physics Experimental Group

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

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

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)

Tel Aviv University High Energy Physics Experimental Group

Detector Energy Readout

Tel Aviv University High Energy Physics Experimental Group

100 GeV

250GeV

400 GeV

Cut = Beam Energy * 0.014

Tel Aviv University High Energy Physics Experimental Group

Energy Resolution & Calibration

Tel Aviv University High Energy Physics Experimental Group

EE %40

Beam energy = 62.32 * Detector Energy + 0.36

Tel Aviv University High Energy Physics Experimental Group

Angular weighting

Tel Aviv University High Energy Physics Experimental Group

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

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

Angular Resolution

0.2E-03

0.035

)(

)(

Tel Aviv University High Energy Physics Experimental Group

Acceptance with old geometry

Tel Aviv University High Energy Physics Experimental Group

Acceptance >30mrad

Tel Aviv University High Energy Physics Experimental Group

Cuts with New Geometry and bhabha MC

Tel Aviv University High Energy Physics Experimental Group

En

ergy

(G

ev)

En

ergy

(G

ev)

250 GeV

No cuts energy and angle cuts

gen (rad)

rec (rad)

gen (rad)

rec (rad)

Tel Aviv University High Energy Physics Experimental Group

New Acceptance

28 mrad

Tel Aviv University High Energy Physics Experimental Group

Rec - Gen

Rec

Gen

Gen (rad)

Rec

(ra

d)

Tel Aviv University High Energy Physics Experimental Group

Detector depth

Tel Aviv University High Energy Physics Experimental Group

Tel Aviv University High Energy Physics Experimental Group

Optimization

Tel Aviv University High Energy Physics Experimental Group

Num. Cylinders

14

28

56

Tel Aviv University High Energy Physics Experimental Group

Background studies

Tel Aviv University High Energy Physics Experimental Group

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

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

Background-1

1%

Tel Aviv University High Energy Physics Experimental Group

Background-2

Tel Aviv University High Energy Physics Experimental Group

Num Photons =1.9

1%

3%

Tel Aviv University High Energy Physics Experimental Group

Background-3

Tel Aviv University High Energy Physics Experimental Group

Pos(rad)

Ele(rad)

Pos(rad)

Ele(rad)

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

Background-4

Next Steps..…

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

Tel Aviv University High Energy Physics Experimental Group

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