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№1 слайд![Geant Radiation Analysis for](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img0.jpg)
Содержание слайда: Geant4
Radiation Analysis
for Space
GRAS
G.Santin1, V.Ivanchenko2, R.Lindberg1, H.Evans1, P. Nieminen1, E.Daly1
1 Space Environments and Effects Analysis Section, ESA/ESTEC
2 PH SFT, CERN
Geant4 Space Users Workshop
Leuven, 5 Oct 2005
№2 слайд![Outline Motivation](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img1.jpg)
Содержание слайда: Outline
Motivation
Description of the tool structure and functionalities
GRAS as
framework for Monte Carlo analyses
Monte Carlo engine for external packages (e.g. SPENVIS)
Present status, expectations, conclusions
№3 слайд![Simulations of the Space](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img2.jpg)
Содержание слайда: Simulations of the
Space Radiation Environment
№4 слайд![Commonly used Ready to Use](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img3.jpg)
Содержание слайда: Commonly used
Ready to Use
Simulation Tools
№5 слайд![The example of MULASSIS Geant](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img4.jpg)
Содержание слайда: The example of MULASSIS
Geant4-based tool
Geant4 is a “Toolkit”
Flexible, powerful, extendable,…
But intentionally “not a tool” ready for use
MULASSIS Features
1D Layered geometry via scripting
Geant4-based
Predefined physics lists
Materials by chemical formula
Interfaced to the Space Environment spectra inside the Web-based SPENVIS framework
User success
Raised the level of radiation shielding analysis in the space community
Limitations
1D geometry
Extensibility
№6 слайд![GRAS Geant Radiation Analysis](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img5.jpg)
Содержание слайда: GRAS
Geant4 Radiation Analysis for Space
Analysis types
3D
Dose, Fluence, NIEL, activation… for support to engineering and scientific design
Dose Equivalent, Equivalent Dose,… for ESA exploration initiative
SEE: PHS, LET, SEU models
Analysis independent from geometry input format
GDML, CAD, or existing C++ class, …
Pluggable physics lists
Different analyses without re-compilation
Modular / extendable design
Publicly accessible
№7 слайд![GRAS components](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img6.jpg)
Содержание слайда: GRAS components
№8 слайд![GRAS components G General](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img7.jpg)
Содержание слайда: GRAS components
G4 General Particle Source
№9 слайд![GRAS components](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img8.jpg)
Содержание слайда: GRAS components
№10 слайд![GRAS components](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img9.jpg)
Содержание слайда: GRAS components
№11 слайд![GRAS Analysis modules](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img10.jpg)
Содержание слайда: GRAS Analysis modules:
Component degradation,
Background
Total Ionizing Dose
Also per incoming particle type, with user choice of interface
Gives event Pulse Height Spectrum
For analysis of induced signal
Units:
MeV, rad, Gy
№12 слайд![GRAS Analysis modules Human](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img11.jpg)
Содержание слайда: GRAS Analysis modules:
Human Exploration Initiatives
Dose equivalent
ICRP-60 and ICRP-92 LET-based coefficients
Units:
MeV, Sv, mSv, Gy, rad
№13 слайд![GRAS Analysis modules SEE in](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img12.jpg)
Содержание слайда: GRAS Analysis modules:
SEE in microelectronics
Path length analysis
Event distribution of particle path length in a given set of volumes
If used with “geantinos”, it provides the geometrical contribution to the energy deposition pattern change
In a 3D model
W.r.t. a 1D planar irradiation model
№14 слайд![GRAS Analysis modules](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img13.jpg)
Содержание слайда: GRAS Analysis modules:
Flexibility
Volume
To identify a volume in the geometry tree
At present implemented as the couple (name, copy No)
Volume Interface
To identify the boundary between two volumes
Couple of Volumes
№15 слайд![GRAS Building blocks .](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img14.jpg)
Содержание слайда: GRAS
Building blocks
1. Geometry
2. Primary generation
3. Physics
4. Modular analysis set via macros
№16 слайд![MC analysis with no C coding](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img15.jpg)
Содержание слайда: MC analysis with no C++ coding
Geometry via GDML
Physics, Source, Analysis via scripts
Upgrades of models / interfaces
№17 слайд![GRAS Analysis Modular,](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img16.jpg)
Содержание слайда: GRAS Analysis
Modular, extendable design
№18 слайд![Analysis Module Easy to](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img17.jpg)
Содержание слайда: Analysis Module
Easy to implement:
Self contained analysis element
Initialization, event processing, normalization, printout all inside
Only one class to create/derive in case a new type of analysis is needed
No need to modify Run+Event+Tracking+Stepping actions
AIDA histogramming “per module”
G4 UI commands “per module”
Automatic module UI tree
a la GATE
/gras/analysis/dose/addModule doseCrystal
/gras/analysis/dose/doseCrystal/setUnit MeV
№19 слайд![For present Geant users GRAS](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img18.jpg)
Содержание слайда: For present Geant4 users
GRAS and previous work
2 ways of obtaining GRAS output without discarding hours/days/months of work
Inserting C++ Geometry, Physics and/or Primary Generator classes inside GRAS
In the main gras.cc
Inserting GRAS into your existing applications
Which way is the fastest depends on existing work
№20 слайд![Engineering tools GRAS as](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img19.jpg)
Содержание слайда: Engineering tools:
GRAS as flexible Monte Carlo engine
Geometry exchange format
- GDML
- CAD / STEP
- …
№21 слайд![User Requirements Complete](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img20.jpg)
Содержание слайда: User Requirements
Complete tool (Geometry, Physics, Source, Analysis)
Available as standalone executable
No need to download and compile Geant4
Easy to integrate in existing applications
Analysis types
3D
Dose, Fluence, NIEL, activation… for support to engineering and scientific design
Dose Equivalent, Equivalent Dose,… for ESA exploration initiative
Transients: PHS, LET, SEU models
Analysis independent from geometry input mode
GDML, or existing C++ class, …
Different analyses set without re-compilation
Modular / extendable design
Source and Physics description adequate to space applications
Solar events
Cosmic rays
№22 слайд![GRAS is being used for](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img21.jpg)
Содержание слайда: GRAS is being used for
Herschel
Test beam detector study
Radiation effects to photoconductors and bolometers
JWST
Dose
Background
ConeXpress
See talk by Ronnie Lindberg
Electronic components
Rad-hardness, local shielding, etc.
№23 слайд![GRAS for HERSCHEL Herschel](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img22.jpg)
Содержание слайда: GRAS for
HERSCHEL
Herschel PACS Photoconductor instrument
Study and test of the detector to assess glitch rate
Impact on science objectives
Simulation of the proton irradiation at Leuven, Belgium
Comparison with glitch data on-going
Need precise description of energy degraders and beam parameters
Extrapolation to detector behavior in space
№24 слайд![GRAS for JWST NIRSpec](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img23.jpg)
Содержание слайда: GRAS for JWST NIRSpec
Degradation
Instrument design phase
Radiation shielding, material choice
№25 слайд![GRAS for JWST NIRSpec](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img24.jpg)
Содержание слайда: GRAS for JWST NIRSpec
Background
Secondary particle production
Shielding effect on the particle flux on the detector
Cosmic Ray background
CRÈME’96 Solar Minimum
Proton simulations
№26 слайд![Status Perspectives CVS](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img25.jpg)
Содержание слайда: Status Perspectives
CVS repository online
http://geant4.esa.int
Code
Latest stable tag works with
Geant4 7.1
GDML 2.3
Documentation
Introduction
README file
Installation
INSTALL file
Detailed User Manual
In preparation
№27 слайд![Conclusions Modular, script](/documents_6/4ad2d2cc97f315a6ed00beced868034c/img26.jpg)
Содержание слайда: Conclusions
Modular, script driven analysis package
Space users oriented, but trying to be generic
Already used in the support of a number of space missions and ground beam tests
GRAS as
Ready-to-use Geant4 tool for common analysis types
Framework for Monte Carlo analyses
Monte Carlo engine for external packages
GRAS used as framework for on-going ESA contracts
REAT_MS (QinetiQ), Geant4 usability for space applications
(CAD interface, SEE analysis, Physics lists for space applications)
Open to comments / contributions for collaborative development
http://geant4.esa.int
We believe GRAS is significantly improving the Geant4 usability
Some features could be used directly by the Geant4 kernel
Related talk
Ronnie Lindberg (ESA) with extensive validation and dosimetry / physics investigations