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Recent developments in Geant4 related activities at CENBG Sébastien INCERTI (IN2P3/CENBG) 13-19...
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Transcript of Recent developments in Geant4 related activities at CENBG Sébastien INCERTI (IN2P3/CENBG) 13-19...
![Page 1: Recent developments in Geant4 related activities at CENBG Sébastien INCERTI (IN2P3/CENBG) 13-19 September 2007 Hebden Bridge, UK 12th Geant4 collaboration.](https://reader030.fdocuments.us/reader030/viewer/2022033105/56649f0c5503460f94c1faa3/html5/thumbnails/1.jpg)
Recent developments in Geant4 related activities at CENBG
Sébastien INCERTI (IN2P3/CENBG)
13-19 September 2007Hebden Bridge, UK12th Geant4 collaboration workshop
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Sorry for not being with you this year, important
commitments tomorrow at Bordeaux University and
early next week
I will try to be as understandable as possible
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Contents
Four simulation projects Ray tracing for nanobeam line design The Geant4 DNA project A mission to Mars ( 3D phantoms for microdosimetry )
Other important information
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Ray tracing simulations
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Ray tracing simulations Collaborators
Fredrik Andersson, PhD, Bordeaux1 Univ. Geoff Grime & Michael Merchant, Surrey Univ., UK &
Oxford Microbeams Ltd.
The CENBG nanobeam line configuration has been entirely designed thanks to Geant4
Construction is still in progress first focusing doublet stage is now in place second focusing triplet stage under construction alignment phase will start right after
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Status New beam emittance measurements performed on the
Singletron accelerator for a better modelling of the incoming beam
New analytical 3D quadrupole field model, more precise than a 3D mesh (presented last year at Geant4 2006 collaboration workshop)
Expected transmitted current
Deflection plates near target optimized ; beam deformation when deflected ripple studies
Results will be presented next week at Ion Beam Analysis 2007 conference series
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Rp=388.890° magnet
Switchingmagnet
incident beamfrom Singletron
C0
x
zy
MICROBEAM line(10° port)
Regulationslits
Intermediateslits
• Faraday cup
• Pressure gauge
• Tantalum plate
• Beam profile monitor
• Unit is mm
35 275 1200
Microbeamobject box
C2
C1
H1V1
720
2980
2500
50
50
2063
930
650
P1
P2
P3
Diaphragm
Beam switch235
675
Quadruplet
Image plane
H0 V0
Nanobeamobject
250
3150
100
40
100
40
Image plane
300
X
Doublet Triplet
CA CB400 400
5100
10°
Proposed NANOBEAM line(0° port)
40
150
Intermediateimage plane
Rp=388.890° magnet
Switchingmagnet
incident beamfrom Singletron
C0
x
zy
x
zy
MICROBEAM line(10° port)
Regulationslits
Intermediateslits
• Faraday cup
• Pressure gauge
• Tantalum plate
• Beam profile monitor
• Unit is mm
• Faraday cup
• Pressure gauge
• Tantalum plate
• Beam profile monitor
• Unit is mm
35 275 1200
Microbeamobject box
C2
C1
H1V1
720
2980
2500
50
50
2063
930
650
P1
P2
P3
Diaphragm
Beam switch235
675
Quadruplet
Image plane
H0 V0
Nanobeamobject
250
3150
100
40
100
40
Image plane
300
X
Doublet Triplet
CA CB400 400
5100
10°
Proposed NANOBEAM line(0° port)
40
150
Intermediateimage plane
Beam emittance modelling Purpose : model precisely the beam transverse position distribution (x, y)
and angular distribution (, ) at the nanobeam line collimator object
Since the nanobeam line is not operative yet, we have measured the beam emittance at the entrance of the microbeam line using a set of vertical and horizontal slits and deflection plates. The beam has then been repropagated towards the nanobeam line object
MICROBEAM line forCellular irradiation and IBA (PIXE, RBS, STIM)
Future NANOBEAM line for IBA (PIXE, RBS, STIM)
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Comparison experiment/model
Model based onA rescaled 3rd order polynomial function + gaussians
Measured emittance
retropropagated to nanobeam
line object
or
X or Y
C0
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Emittance propagation with Geant4 along nanobeam line
C0 CA
CB
IM
I
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Quadrupole field models Nanobeam line consists of a doublet and a triplet of OM-50
quadrupoles (length : 100 mm, inner radius : 7.5 mm)
Last year we presented a 3D mesh model of a single quadrupole, computed thanks to the OPERA suite software
Advantages : More realistic than a classical square field model Modelling of fringing fields on quadrupole edges
Drawbacks : Granularity not high enough for ray tracing with parallax rays 1 mm3
Solution : develop an analytical model of the quadrupole magnetic field based on Enge’s formalism and valid for all angular divergences
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Field models
-6,00E-05
-4,00E-05
-2,00E-05
0,00E+00
-150 -100 -50 0 50 100 150
Z position (mm)
B (
T)
field x or y component from 3Dmesh model
field x or y component fromEnge's model
field x or y component fromsquare model
-4,00E-08
-2,00E-08
0,00E+00
2,00E-08
4,00E-08
-150 -100 -50 0 50 100 150Z position (mm)
Bz
(T)
field z component from 3D meshmodel
field z component from Enge'smodel
Transverse Bx or By component
Longitudinal Bz component
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Intrinsic aberration coefficients
xD x x=
x q
x qd
2x qf
3x q
yD y y=
y f
y f d
2y q f
3y f
CoefficientSquare
field3D Mesh field
Enges analytic model
6.48 E+01 6.51 E+016.49 E+01
-1.62 E-01 2.16 E+00-2.00 E+00
-2.07 E+03 -2.10 E+03-2.09 E+03
1.04 E+03 -1.72 E+046.78 E+03
3.74 E+03 3.17 E+03 1.98 E+04
1.01 E+02 1.01 E+021.01 E+2
-5.16 E-02 -5.93 E-02-2.71 E-01
-3.79 E+02 -3.73 E+02-3.74 E+02
3.08 E+02 1.16 E+034.36 E+03
2.10 E+02 1.10 E+025.31 E+02
Spherical intrinsic aberration increase
(larger spiral force by Bz)
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Grid shadow imaging A widely used method to measure the aberrations
coefficients of a certain quadrupole system.
The method gives image coordinates from a grid placed at the image-plane and the corresponding divergence coordinates from a grid shadow pattern, cast on an ion luminescent screen placed a couple of hundred millimetres downstream.
250
300
Image plan
DOUBLET TRIPLET Electrostatic deflection
Grid
Luminescent screen
500 mm
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Examples of grid shadow images
Perfect system
with intrinsic spherical
aberration only
Parasitic rotation (0.1 deg) of the
last quadrupole
Forward tilt (0.01 deg) of the last magnet
Same tilt is present but with an added rotation (0.1 deg) of the first magnet in the triplet
~10h of CPU
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Deflection plates Modeling of the electrostatic scanning plates with Geant4
Changing the length ratio between x and y scanning plates in order to find the optimum scan size for a given voltage under the conditions
scanning plate system total length equals 52 mm gap between plates should be greater or equal to 4 mm
The resulting model of the scanning plates was used to investigate the effect on beam size and shape from voltage ripple and deflection.
Ripple uniform randomized ripple of 80 mVolt peak to peak set on each plate 1 MeV proton beam of 50 × 30 nm FWHM 37 % and 93 % broadening in x and y planes respectively
Deflection 400 µm in both planes with 2000 ∆V between the plates 3 MeV proton beam 7 % and 15 % broadening
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Future Short term
These results will be published this autum in NIM We have so far 4 papers published for this
project Will be proposed as a Geant4 advanced example
Mid-term : when the nanobeam line is operative New emittance measurements on the nanobeam
line Comparison of measured performances and
Geant4 predictions
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The Geant4 DNA project
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The Geant4 DNA project
Collaboration of S. Chauvie, S. Incerti, P. Nieminen, P. Moretto, M. G. Pia
Main objective : prediction of DNA damages (double strand breaks – fatal lesions -, DNA fragments…) after irrradiation of cells, taking into account realistic DNA models
Physics models paper submitted to TNS, review still in progress
I’m currently finalizing the final states generation for all processes before committing to CVS (electrons, protons, alphas and their charge states)
Expect the full package to be ready for the December release
Urgent need for collaborators ; a new form of collaboration ?
IN2P3 will support this activity
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Example : e- ionisation TCS
-100
0
100
200
300
400
500
600
700
800
10 20 40 200 450 540 1000 3500 7000 120001700030000
T (eV)
Cro
ss s
ecti
on
(1/
3.34
3E22
)m^
2
Total
Shell 1
Shell 2
Shell 3
Shell 4
Shell 5
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Future of DNA project Short term
Finish final states Speed issues Test DNA in our voxellized cellular phantoms Cell survival advanced example
Long term Chemical phase DNA geometry Biological damage stage Open to any low energy electromagnetic extension of
Geant4 Other materials than liquid water for Physics models : DNA
basis, Si for space applications Test on Grids ?
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A mission to Mars
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A mission to Mars Collaborators
Aurélie Le Postollec, PhD, Bordeaux Univ. Giovanni Santin, Petteri Nieminen, ESA/ESTEC Laurent Desorgher, Bern Univ. Lewis Dartnell, Oxford Univ. College
Development of a biochip a miniature sampling method allowing identification of biological molecules
(biomarkers) for the detection of traces of life in the solar system recognition using specific fluorescent molecules (ligands) fixed on a plate
Need to test the biochip recognition capabilities using irradiation facilities
Experimental irradiation conditions must be determined in order to be as close as possible to the radiation environment encountered during the mission
We use Geant4 in order to simulate this environment : In situ, on Mars ground (achieved) During travel Earth Mars (in progress)
l = 25 mm
L = 75 mm
H = 1mm
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On Mars ground Question : how to simulate the irradiation of a biochip a few cm2 in
surface on Mars ground using cosmic spectra generated on top of the Mars atmosphere ?
Solution : we have created an interface between two useful tools : PLANETOCOSMICS and GRAS. This interface uses ROOT classes in order to shoot GRAS primary particles from PLANETOCOSMICS spectra.
More precisely : Primary particles from CREME96 generated on top of atmosphere
GCR : H, He, C, O SPE : H, He (worst week scenario)
Atmosphere (Mars-Gram) and soil (Pathfinder-Sojourner) modeled from PLANETOCOSMICS
Secondary spectra extracted on ground Inserted into GRAS after proper normalization Simple rover geometrical model and dose calculation
During travel : primary spectra are inserted directly into GRAS
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Total fluence on Mars ground
Biopuce mass ~4,4g
Dose in biochip = ~36 Gy in one month
ParticlesFluence without SEP(particle/cm²/s)
Fluence with SEP(particle/cm²/s)
Proton 5,16 15,64
Alpha 0,32 0,33
Neutron 80,11 145,65
Electron 8,54 11,72
Positron 2,60 2,88
Gamma 160,75 277,86
Deuteron 0,16 0,16
Triton 0,081 0,082
Li 0,018 0,018
Be 0,051 0,051
B 0,014 0,014
C 0,055 0,055
N 0,038 0,038
O 0,12 0,12
• Generated by GCR H, He, C & O primaries
• Physics list :- standard EM- QGSP_BIC_HP
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Cumulated individual spectra
Ion z=7
Ion z=8
Ion z=3
Ion z=4
Ion z=5
Ion z=6
Protons
AlphasGammas
Nb particles/cm²/s
Electrons
Positrons
Deuterons
Tritons
GCR
GCR + SEP
Neutrons
T (MeV)
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Integral neutron flux on ground
GCR
neutrons/cm²/sEvaporation peak
GCR + SPE worst week
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Experimental irradiation of biochip on AIFIRA facility 96 h of AIFIRA beam time mid-October
Neutron effects never investigated
Among the dominant species on ground after gammas
Verification of antibody + fluorophore recognition and fluorophore resistance
Lyophylized samples or in solution
4 orders of magnitude in absorbed dose D in one month on Mars ground, 10 D, 102 D, 103 D (just to be
safe…)
Two energies : 0.6 MeV and 6 MeV
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Neutron production
6 MeV
0.6 MeV
Two energies separated by one order of magnitude
Solid target
Gas target
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Incident n spectra generated with Geant4
Angle (deg) Energy (MeV) Angle (deg)
En
erg
y (
MeV
)
Emission angle Emission energy
Neutrons are generated in Geant4 from published differential cross section and production energy tables
D(d,n)3He for Td=2.8 MeV
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Simulated irradiation setup for flux calculation
Fluxes on biochip calculated by two methods : « Analytical » simulations
Cross section in biochip solid angle calculated from
« Monte Carlo » : Geant4 simulations shooting individual neutrons from source
sindE LE
d dq
qD =
target 2biochip
sinI LlN N
e ds qD
DW:
d
HTA horizontal plate75.3 (l) x 24.9 (L) mm2
n source
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Irradiation duration
0.6 MeV : 7Li(p,n)7Be for Tp=2.3 MeV d = 10 cm, = 40° tot=0.024 = 8.1 107 n/s Duration to reach D ( 1 month) ~ 1.4s 10D 14s, 10²D 2min20s, 103D 23min20s
6 MeV : D(d,n)3He forTd=2.8 MeV d = 10 cm, = 20° tot=0.017 = 9.4 105 n/s Duration to reach D ( 1 month) ~ 57 s 10D 9min30s, 10² D 1h35min, 103 D 15h50min
d
HTA horizontal plate75.3 (l) x 24.9 (L) mm2
n source
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An increasing local collaboration Coussot Gaëlle, IBMM, UMR5247, chemist post-doc
Dobrijevic Michel, LAB, UMR5804, OASU, astrophysicist Geffard Michel, IMS UMR5218, biologist
Incerti Sébastien, CENBG, physicist
Le Postollec Aurélie, LAB, UMR5804, OASU, PhD physicist
Moretto Philippe, CENBG, physicist
Trambouze Odile, IBMM UMR5247, bio-chemist
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Future Short term
Geant4 simulation of n irradiation experiment taking into account a detailed geometry of the irradiated samples
Realistic CAD model of rover & spacecraft from EXOMARS mission (Fastrad conversion to Geant4)
Realistic trajectory model from PHOENIX mission ?
Mid-term Hadronic models > 10 GeV/n in PLANETOCOSMICS
Long term A proposal submitted in 2008 to CNRS for a first
biochip / dosimetry test aboard ISS
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Other points
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An annual tutorial in France
We will organize a Geant4 tutorial in France every year
Supported by IN2P3 & CEA
Local organizing committee : S. Cavata, S. Incerti, M. Maire, M. Verderi
A different form ? (building a full example from scratch)
Dates & place not selected yet
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Other teaching activities One day Geant4 tutorial at the Do-Son
school on Advanced Computing and GRID Technologies for Research (CNRS/Vietnam)
Institute of Information Technology, VAST, Hanoi, Vietnam, 5-16 November 2007
Organizers : V. Breton (IN2P3), B. Mely (CNRS), T. A. Ngo (IoIT)
Geant4 is now part of an official university cursus (Master Recherche 2 – Astroparticles and Nuclear / Particle Physics) at Bordeaux 1 University from this year
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A web site
http://geant4.in2p3.fr
New look in progress (CNRS requirements)
IN2P3 collaborators Tutorial information Download freely VMware tools and files
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A new KEK-IN2P3 collaboration Collaboration around Geant4 activities Funded for 2007 & 2008 by KEK & IN2P3 Topics
Education applications Biology, Medicine & Space (DNA,
hadrontherapy, biochip…) GRID
We need to organize our first workshop
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KEK & IN2P3 teams
Name Affiliation Name Affiliation
Takashi Sasaki KEK Sébastien Incerti
IN2P3 - CENBG
Katsuya Amako KEK Vincent Breton IN2P3 – LPC Clermont
Koichi Murakami
KEK Lydia Maigne IN2P3 – LPC Clermont
Go Iwai KEK Michel Maire IN2P3 – LAPP
Hajime Yoshida Naruto Jean Jacquemie
r
IN2P3 – LAPP
Tsukasa Aso TNCMT Marc Verderi IN2P3 - LLR
• 12 collaborators (researchers + engineers)• Members of the Geant4 or GATE collaborations
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Thank you for your attention