development of germanium detector simulations with the geant 4 toolkit andrew mather...
TRANSCRIPT
Development of Germanium Detector Simulations with the Geant 4 Toolkit
Andrew [email protected]
12th UK Postgraduate Nuclear Physics Summer SchoolSt. Andrews
September 1st - 14th 2003
Presentation Overview
Geant 4 – Introduction
Geant 4 – Simulation Structure
Why use Simulations
HP Germanium Detectors Simulated
Results
Conclusion
Geant 4 - Introduction Developed at Cern by HEP.
Based on Object Orientated Architecture, Using C++
Used in HEP, Nuclear, Medical and Accelerator Physics.
Fully open source, extremely flexible and extendable due to OO nature.
Geant 4 – Simulation Structure
P h o to e le c tric E ffe ctC o m p to n S ca tte ring
P a ir P rod u c tionM C S , Io n iza tion e tc
P h ys icsL ist R a d io a c tive S o u rce(S e le c tio n o f sou rce s in c lu d ing
p o in t o r co llim a te d)
T ra cke rS DR e sp on s ib le fo r ou tp u t
o f re su lts
D e te c to r G eo m e try(se le c tion o f g e om e tire s in c lu d ing
T ig re a nd G M X 4 5 P A S )
L ab V isu a liza tio n M a n a g er
H P G e _S im u la tio n .cc
Why use Simulations Back-up (or otherwise!) experimental observations.
Ability to retrieve information not accessible from real detectors. (e.g. exact position and interaction type of gamma-ray interactions)
Can produce higher statistics for certain results.
Help decide properties that will yield best experimental results before commencing the experiment.
Cost and time saving, giving information that would not have been feasible to measure experimentally.
HP Germanium Detectors Simulated
(All sizes in mm)
Results – “GMX45PAS”
60Co @ 268mm
Single Crystal Ge Detector
(GMX45PAS)
Geant 4 MCNP*Penelope*
Peak to Compton 60:1 64:1 82:1 -
Relative Efficiency 46% 29 % 27 % 27 %
* MCNP and Penelope results courtesy of Mark Ibison
Results – “Tigre”
60Co @ 268mm
24 fold segmented Ge Detector(Tigre)
Geant 4
Relative
Efficiency 64% 34 %
Results – Multiplicity 122 Kev
Results – Multiplicity 1408 Kev
Results – First Interaction
Results – 511 Kev 1st 2nd 3rd interaction
Results – Event ID
Results – Doppler Broadening
Conclusion Simulations have produced results mostly in
agreement with experiment.
Produced some interesting results to be followed up experimentally in the future.(Tigre Hit-Patterns and Multiplicity data)
Greater understanding from retrieved data normally lost or hard to measure in experiments.