KEK Geant4 Users Workshop: a selection of presented user applications

1
KEK Geant4 Users Workshopa selection of
presented user applications

• Koichi Murakami
• KEK
• Geant4 Workshop 2003 (TRIUMF)

2
History

• In Japan, we have held 5 times of Geant4 user
  workshops
• Dec./00, Jul./01, Mar./02, Jul./02, Jul./03
• inviting foreign developers in each time.
• , and also two times of tutorial lectures.
• Jun./00, Jul./02
• three days of tutorial course
• URL http//www-geant4.kek.jp/G4UserGroup/

3
Participants of the workshop

• Developers
• G.Cosmo (CERN)
• M.Asai, T.Koi (SLAC)
• H.Yoshida (Naruto)
• hosted by KEK
• K.Amako, T.Sasaki, K.Murakami
• Participants
• About 50 people from wide variety of application
  domains attended.
• medical application
• space science
• experiments of particle physics (HEP, non-Acc.
  phys.)

4
Outline of the workshop

• Date 18-19/Jul./03 (two days)
• The workshop consists of 7 series of sessions
• Overview
• Users presentations
• medical application
• space application
• physics experiments
• other related topics
• User interface
• Geometry description
• Particle and physics
• Advanced functionalities
• Summary

5
Contents of users presentations

• Medical application session
• 4 talks
• we had free discussion time
• collecting user requirements
• how to establish user community
• Space application session
• 3 talks
• satellite project
• space science
• radiation shielding of silicon device in space
  environment

6
(Contd)

• Physics experiments session
• 3 talks
• shielding effect in a neutrino experiment
• air cascade simulation of ultra-high energy
  particles
• simulation of ATLAS SCT
• Other related topics
• 4 talks
• JAS3
• parallelization with TOP-C
• There were requests for parallel processing.
• interfacing physics packages
• EGS4, JAM/JQMD (refer to talks on Saturday)

7
Medical application session

• Since the last year workshop, G4Japan group keeps
  to make communication with medical application
  users in Japan.
• We collected various usecase-s and user
  requirements from medical application users.
• Introduction of radiation therapies operated in
  NIRS( silde-8,9) (N.Kanematsu, NIRS)
• A helpful summary report on simulation
  calculation in radiology (slide-10-12) (M.Hirai,
  JAERI)
• we got concrete objects to be simulated in
  medical application.
• Requirements for nuclear reactions from heavy ion
  users. (K.Yusa, Gumma)

8
Planning of Radiation Therapy
planning system with CT scan device

• - CT scanning
• - finding target (cancer)
• fixing parameters of beam and collimeters
• calculating dose distribution

9
LINAC
Syncrotron
Dose distribution for tissue of each radiation ray
exposure rooms
HIMAC (Heavy Ion Medical Accelerator in Chiba) in
NIRS (National Institute of Radiological Sciences)
12C
cancer
10
Simulation of Accelerator Head

• BEAMnrc
• EGS-based code specified to the medical
  accelerator.
• Most of geometries are prototyped, named as
  component module.
• Beam phase-space is storable and reusable in any
  z-position.
• Parallelized by NQS and NFS.
• Can Combine with DOSXYZ ( 3D-dose distribution
  Package )

http//gold.sao.nrc.ca/inms/irs/BEAM/beamhome.html
11
Intensity Modulating Radiotherapy (IMRT)

• Finest photon radiotherapy since mid-90s

Each intensity map archived by superimposing 30
300 subfield
12
Multi-Leaf Collimator

• consist of 5 mm (typically) thick multiple leaves.

Each intensity map archived by superimposing 30
300 subfield like David.
13
HIMAC P152 Experiment

• One of our concerns is focused on cancer
  treatment using heavy ion (12C) accelerator.
• HIMAC in NIRS
• promising and now under experimental stage
• We have planed a beam test experiment with
  emulsion device. (HIMAC P152) (K.Amako, KEK)
• This is a collaboration between a HEP experiment,
  medical users and Geant4.
• Our aim is to observe reactions of heavy ion with
  various materials using emulsion device, which
  has been used in the OPERA experiment.
• We can take advantage of high position resolution
  and powerful track finding ability thanks to the
  automatic scanning system.
• We hope that the data will be used for
  validation/improvement of heavy ion simulation.
• We had two times of exposure times using HIMAC
  beam line.
• 12C with 135MeV/n and 180MeV/n
• studying for capability of identification of
  particle/charge/isotope
• Two additional exposure times are planed in this
  year.

14
ECC (emulsion chamber) 116 layers of emulsion
firms
emulsion firm
HIMAC P152
Geant4 simulation
15
Space application session

• Simulation for Swift satellite
• a satellite project for observing gamma-ray
  bursts (GRB)
• detector simulation of semiconductor device for
  reactions of gamma with 15-150 keV
• (Slide-16) (M.Suzuki, Saitama)
• Solar physics
• estimation of original energy spectra of electron
  and proton accelerated by Solar flare
• (Slide-17-18) (J.Kotoku, Tokyo)
• Radiation shielding of silicon device in space
  environment
• (Slide-19) (H.Awaki, Ehime)

16
A full simulator for the Swift satellite
observing gamma-ray bursts
GRB with radiant energy
The Swift Mass Model (SwiMM)
Swift satellite
Comparison between simulation and data for 57Co
Burst Alert Telescope (BAT)
17
Estimation of original energy spectra of electron
and proton accelerated by Solar flare
Initial spectrum (assumption) Geant4
simulation with condition of solar - density -
magnetic field
feed back
gamma-rays
Solar observation satellite Yohkoh
comparison
observed spectrum
18
electron
photon
simulation for electron
Compton scatterings
brems.
after Compton scatterings
initial
brems. gamma
detector response
observed spectrum
19
Radiation shield study in space environment
of secodaries
Simulation for 100MeV proton incidents
secondary electron
secondary photon

• The profile of Geant4 simulation was
• consistent with rough calculation.
• More detail study will be carried out for
• design of more realistic shields

20
Physics experiments session

• MOON
• an experiment for observation of double beta
  decay and solar neutrino
• calculation of shielding effect
• (Slide-21-22) (Y.Shichijo, Tokushima)
• IceCube
• requirements for simulating ultra-high energy
  physics (1021 eV)
• (Slide-23-26) (R.Ishibashi, Chiba)
• ATLAS
• SCT simulation with FADS/Goofy
• calculating total radiation length with geantino
• (Slide-27) (Y.Tomeda, Okayama)

21
Conditions of GEANT4

• Shield material

• Pb (r11.35g/cm3)
• H2O (r1.0g/cm3)

• Radiation source

• g ray (Eg2.614MeV)
• 100 million event
• Thermal neutron
• (En0.025eV)
• 10 million event
• Position 2.1m(z-axis)

5
22
Summary

• Studied Shielding effect in MOON

• Reduction of g rays BG

• Pb all energy BG, about 1/10 - 1/100

• H2O low energy BG, no reduction

• Reduction of thermal neutrons BG

• Pb all energy BG, about 1/10

• H2O low energy BG, no reduction

Pb is better shielding material than H2O in MOON
15
23

• Look for the neutrinos interaction product
  (e,m,t)
• Use the earth as a filter
• 11,000,000
• background rejection power is required.

cosmic ray
n
n
m
24
South Pole
Dark sector
Skiway
AMANDA
Dome
IceCube
25
The IceCube observatory

• 80 strings
• 4800 optical modules
• 1 km3 volume
• First strings to be deployed in Dec. 2004
• AMANDA contained within IceCube

26
Energy Requirements
Incident ? 1021 eV (1ZeV)
Hadron 1017eV (100PeV)
Lepton (µ,t) 1017 eV (100PeV)
Electromagnetic Cascade Hadronic Cascade
27
calculation of radiation length of barrel SCT
ATLAS SCT simulation
Simulation for fine geometry
28
Summary

• In Japan, there are many potential Geant4
  users, spreading over wide variety of application
  domains.
• medical application
• space application
• physics experiments
• They start/plan to make use of Geant4 in their
  own application.
• And, we keep to make communication with such
  users, and collect many usecase-s and user
  requiremensts as user supports.