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BESIII TOF DigitizationPowerPoint Presentation

BESIII TOF Digitization

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## PowerPoint Slideshow about ' BESIII TOF Digitization' - bert-beck

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### The end

Outline

- TOF Geometry
- TOF Digitization version 1
- TOF Digitization version 2
- Something about running BOOST

end-cap

Digitization from hits

digitization

Hit

digi

Hit

edep

digi

time

Hit

position

event

digi

Hit

Hit

digi

Hit

Hit

forwADC

forwTDC

forward: east backward: west

backADC

No backward output for endcap tof

backTDC

edep (1)

edep, arrivalTime 2

edep (2)

edep, arrivalTime n

edep (n)

Time walk added

TDC = tdc + c(ADC)-0.5

Digitization Version 1Select Arrival Time

edep to ADC

- Select first Arrival time
- Apply dE/dx threshold cut

Geant

arrivalTime (initial)

ADC

edep :-dE/dx in scintillator

arrivalTime : time of flight + dz/vel

Tof digitization

PMT resolution

tdc smeared by Gaussian with s(f(ADC))

tdc

ADC

TDC

ADC

Digitization Version 1

- 1GeV e-
- Theta=90
- Phi: 0-360
- Sigma = 84 ps

More to do about version 1

- Correction on ADC and TDC
- ADC vs z-hit
- TDC Resolution vs ADC
- Time-walk correction
- TDC vs ADC

- Parameters will be taken from data fitting

Digitization Version 2

- Full simulation
- Scintillation light emission in each step
- Light propagation in scintillator upto PMT
- PMT response
- Photoelectron production
- Signal pulse production

- Discrimation of PMT signal at two levels
- If pulse height>HL, then make T,Q output

Emit time parameters

Light attenuation length

Refractive index

Light output

PMT

Gain

Rise time

Effective area

Transit time(and spread)

Collection factor

Quantum efficiency

HL, LL

ParametersScintillation light emission

- Number of photons is proportional to edep
- 10000/MeV

- Uniform distribution
- Emission time: a time profile assumed

temit

Light propagation

- Lpro = d / cosθ
- Propagation time: tpro= Lpro/ vel
- Attenuation in TOF counter is simulated
- Part Lights escape or lost

PMT

θ

d

PMT response

- Photoelectron production
- Photoelectrons are produced with quantum efficiency
- Number of photoelectrons is reduced due to the dynode structure
- Transit time is added

- PMT response for single photon electron

PMT response

Hit 1

direction

Path length

Pro time

Photon 1

reach PMT

Transit time

end time

endTime = flightTime+emitTime+ProTime+TransitTime

………..

Photon N

…..

Hit N

Integration of arrival photon times with PMT response function

Simulation of readout electronics

- Each PMT signal is examined using double threshold (LL,HL)
- A signal larger than HL threshold provides a gate to measure TDC
- TDC is given at the moment when PMT pulse crosses LL threshold

HL

LL

TDC

e- 1GeV/c Z=0 :forward TDC resolution = 121.6ps backward TDC resolution = 121.4ps

log(forwADC/backADC) vs z-hit

koala: overwhelmed

lxplus: the last choice!

even problems exist

Using BesGenModule and BesSim

can avoid changing environment

Running environmentRunning environment

- lxplus04, 05
- /ihepbatch/bes/dengzy
- /afs/ihep.ac.cn/users/d/dengzy (2G)
- /ihepbatch/besdata/public/dengzy (5G)

- more document
- G4ParticleList
- GenbesParticleId
- PDGscheme

http://boss.ihep.ac.cn/SofPro/simulation.html

Thanks!

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