1

Planed software specRay-trace simulator based on Geant4PMT simulator based on ROOTSummary

Status of DOM simulator

AMANDA/IceCube meeting in BartolMar. 24, 2004

Kotoyo HoshinaChiba University

Ice

OM(DOM)

Planned software spec

K40

Ray tracing Simulator

BG Noise Simulator

Wave Length Shifter Simulator

PMT Simulator

&BG Noise Simlator

Photon Propagator PMT SimulatorRay tracing

Use Geant4 except for PMT simulator

How can we get the PMT solid?

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Ray-trace Simulator based on Geant4

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The PMT solid

Complicated Boolean solidscannot bedrawn correctlyComputing time will be longer

Use G4UnionSolid!

Problem:

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Test of PMT solid

Test the solid by geantino

Kill tracks at the surface of PMT

Next :Install material properties!

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Material properties

200 250 300 350 400 450 500 550 6000

0.2

0.4

0.6

0.8

1

pen

etra

tio

n (

I /

Io)

wave length [nm]

GEL:

General Electric

RTV6156A / B (1:1)

10 mm thickness

250 300 350 400 450 500 550 600

pen

etra

tio

n (

I /

Io)

wave length [nm]

0

0.2

0.4

0.6

0.8

1

Glass:

Borosilicate

10 mm thickness

penetration data taken by Eliza Resconi

200 250 300 350 400 450 500 550 6000

2

4

6

8

10

Ab

sorp

tio

n L

eng

th [

cm]

wave length [nm]

GEL:

General Electric

RTV6156A / B (1:1)

250 300 350 400 450 500 550 6000

2

4

6

8

10

Ab

sorp

tion

Len

gth

[cm

]

wave length [nm]

Glass:

Borosilicate

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Material properties (DOM setup)

0.8(1cm Glass) x 0.7(1cm Gel) = 0.56(at PMT)

0.2

0.4

0.6

0.8

1

Angle [deg]

pen

etra

tion

(I

/ Io

)

0 10 6050403020 908070

Benthos grass + Gel

Wave Length : 340 nm

26 inch (~33cm)

1cm 1cm

Glass

PMT

Gel

Preliminary!

Problem: Polarized photons go into the infinite loop :-(

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PMT Simulator based on ROOT

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Software Structure

Well - ModularizedEquip wrapper class (DOMVModule) for future framework I/O facility -> Not yet! wait new framework

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PhotoCathode Simulator(DOMPMTPhotoCathode)

Generate photo electron(s) from arrived photon(s) with taking into account of the Uniformity Map

INPUT: Arrival Photons

OUTPUT: PhotoElectrons

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Charge Response Simulator 1(DOMPMTChargeResponce)

Single PE response can be represented Exp + gaussian

4 parameters:How can we reduce the number of parameters?---> see Next!

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Charge Response Simulator 2

Gain curve: required measurementsq0, qtau: get from scaling factor and Gain!P_ex : const!

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Charge Response Simulator 3(DOMPMTChargeResponse)

Multiple PE Charge Response is not yet implemented

Just add one function to adopt Multiple PE

INPUT: 1PE

OUTPUT:Charge[C]

RandomSeed

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WaveForm Simulator(DOMPMTWaveForm)

INPUT:Charge[C]

Get Norm. factor form

Charge

OUTPUT:WaveFunc

5 pulsesSuperimposed

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SummaryGeometrical implementation of Ray-trace simulator based on Geant4 is almost finished, however, there are remaining problems inside Geant4.Base structure of the PMT simulator based on ROOT has developed. Currently, only single p.e. response can be simulated.Next step:

Ray-trace sim: fix the geometrical problems and append optical properties to the materials (reflection, wavelength shift, etc)PMT sim : install multiple p.e. response and adopt new framework