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Forward spectrometer. TOF. RICH. H calo. E calo. PID via TOF. m. L =7 m. σ p. σ m. σ L. σ t. (. ). =. +. γ 2. +. p. t. L. σ p. = 0.005. p. σ t. = 50 ps. GEANT4 simulation. (in collaboration with S. Petersburg State Polytechnic University,

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Forward spectrometer
Forward spectrometer

TOF

RICH

H calo

E calo

PANDA Russia Workshop, ITEP April 18, 2008


Pid via tof
PID via TOF

m

L =7 m

σp

σm

σL

σt

(

)

=

+

γ2

+

p

t

L

σp

= 0.005

p

σt

= 50 ps

PANDA Russia Workshop, ITEP April 18, 2008


Geant4 simulation
GEANT4 simulation

(in collaboration with S. Petersburg State Polytechnic University,

Experimental Nuclear Physics Department )

BC408 plastic scintillator 140*10*1.5 cm3

- without light guide

- with light guides for 2” PMT (46 mm diameter)

- with light guides for 1” PMT (24 mm diameter)

PANDA Russia Workshop, ITEP April 18, 2008


Energy deposit
Energy deposit

Electrons 1GeV

Ionization

Bremsstrahlund

Landau distributions

Protons 200 MeV

Ionization

Gaussian distribution

PANDA Russia Workshop, ITEP April 18, 2008


G4 optical photons

G4OpAbsorption –light attenuation

G4OpRayleigh - Rayleigh scattering

G4OpBoundaryProcess :

dielectric - dielectric

total internal reflection

Fresnel reflection

Fresnel refraction

dielectric – metal

G4OpticalSurface :

polished

ground

G4 Optical photons

Scintillation process only (no Cerenkov Photons)

PANDA Russia Workshop, ITEP April 18, 2008


Light attenuation
Light attenuation

Nphot acc

e (Z/205)

~

Nphot gen

PANDA Russia Workshop, ITEP April 18, 2008


Bc408 plate light guides polished surface
BC408 plate, light guides, polished surface

PANDA Russia Workshop, ITEP April 18, 2008


Photon propagation time
Photon propagation time

no light guide

light guide for 2” PMT

light guide for 1” PMT

R2083 TTS=370 ps. R4998 TTS =160 ps.

370/ n = 6.8 ps. 160/ n = 5.3 ps.

PANDA Russia Workshop, ITEP April 18, 2008


Test stand
Test stand

PANDA Russia Workshop, ITEP April 18, 2008


Test stand1

For this test we used plastic scintillator

15*15*15 mm3, 2 R4998 PMT and

radioactive 90Sr β-source.

Test stand

190 ps

100 ps

PANDA Russia Workshop, ITEP April 18, 2008


Test stand2
Test stand

3 BC408 plates :

140*10*1.5 cm3

140* 5*1.5 cm3

100*10*1.5 cm3

6 PMT Hamamatsu:

4 - R4998

2 - R2083

Thanks to J.Ritman, Julich, KFI

The prototype with BC408 plastic

140*5*1.5cm3 is ready for testing

PANDA Russia Workshop, ITEP April 18, 2008


To do
To Do

MC simulation

TOF Wall

-Different optical surfaces and wrapping

-Light guide geometry optimization

-Implementation of PMT to GEANT4

PID (forward detector)

TOF stand

for real BC408 plastic

-optimization of TOF resolution

- test with radioactive sources, cosmic

and on proton beam.

PANDA Russia Workshop, ITEP April 18, 2008


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