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The P152 Experiment at NIRS Overview 1 st Workshop of the Italy-Japan Collaboration on Geant4 Medical Application 8-9 March 2004 INFN Genova Katsuya Amako KEK. Purpose of the Experiment. - PowerPoint PPT Presentation
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The P152 Experiment at NIRSOverview
1st Workshop of the Italy-Japan Collaborationon Geant4 Medical Application
8-9 March 2004INFN Genova
Katsuya Amako
KEK
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Purpose of the Experiment
To study nuclear interaction processes of medical heavy ion beam with elements of human body (Water, C, N, Ca, P) by the high spatial resolution emulsion chamber.
For reconstruction of tracks recorded in emulsion, the high-speed automatic film scanning machine is utilized.
To study nuclear interaction processes which are important to the shielding of detectors installed in space-craft/satellite.
Compare the obtained experiment results to the Geant4 simulation and to improve Geant4 physics if necessary.
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Why Emulsion Chamber?
Harp Experiment ps214@CERN
Wide acceptance measurement of hadron producitons from interactions of Proton ( 2GeV ~15GeV ) with nucleus
• TPC• Forward spectormeter• Gas Cherenkov• ToF, etc
P152 Experiment
I know this comparison is not fare but….
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The P152 Experiment Group History
Nov. 2002 : The 1st Kickoff Workshop @NIRS Dec. 2002 : Submitted a proposal to NIRS Jan. 2003: Proposal approved 4 data takings since April 2003
Members( NIRS ) N. Kanematsu, M. Komori
( Nagoya ) K. Niwa, T.Toshito, T.Nakamura, T.Ban, N.Naganawa, S.Takahashi
( Uchu-ken ) M.Ozaki ( Kobe ) S. Aoki (Aichi) Y.Kodama
(Naruto) H.Yoshida (Ritsumei) S.Tanaka (SLAC) M. Asai, T. Koi
(Tokyo) N.Kokubu (Gunma) K. Yusa
(Toho) H.Shibuya, R.Ogawa, A. Shibazaki, T.Fukushima
(KEK) K. Amako, K.Murakami, T. Sasaki
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HIMAC Overview
Experiment Areas
RFQ Linac800 KeV/u
Alvarez Linac6 MeV/u
Synchrotron800 MeV/u
Ion BeamsHe, N, C, O, Ne, Si, Ar, etc
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ECC and Emulsion Film ECC (Emulsion Cloud Chamber) Emulsion Film
(Standard: Opera Film)
Films are stacked to form ECC
[example]
ECC used in the 1st beam time has 116 films.
[Note]
ECC shown here is not one used in the 1st beam time.
12.5 cm
10 cm
Thickness 288
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Opera Film Structure (Cross section view)
Emulsion Layer (Sensitive area)
Emulsion Layer (Sensitive area)
TAC – Film Base(not sensitive)
200 m 44 m44 m
Particle path
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Auto Scanning Machine ( Nagoya Univ.)
films Head of scanning machine (microscope + CCD)
Scanning Speed~7 hours /1 film (both film sides, ~20,000 tracks)
Spatial Resolution~ 1 m
Angular Resolution~ 1 mrad
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Track Reconstruction
Beam Track Reconstruction135 MeV/u 12C beam
Film# 100
Film# 65
2 cm
2 cm
Total track# ~ 20,000
[Note]Each film layer is colored in the cyclic sequence of
violet,indigo,blue,green,yellow,orange,red
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Particle ID Particle can be identified by the grain density of track
(ionization density)
Z=6
Z=1Z=2
Z=2
Z=1
Z>2
Z=2Z=1MIP
Prelimiary
ionization/grain density
~300
Need some improvement to separate particles with z>2.
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Machine Time Summary April 2003
Goal: Preliminary test to reconstruct ion interactions in ECC Beam: 12C, 135 MeV/u Target : ECC only
June 2003 Goal: Preliminary test of particle ID using ECC Beam: 12C, 180 MeV/u Target : ECC only Permanent magnet spectrormeter for particle ID
Sepember 2003 Goal: Preliminary test to measure interactions of 12C with water Beam: 12C, 430 MeV/u Target : water
January 2004 Goal: 2nd Preliminary test to measure interactions of 12C with water Beam: 12C, 430 MeV/u Target : water
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Geant4 Simulation
ECC
Beam Line Elements
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Range Struggling of 12C in ECC and Geant4
Point with error bars
data from June 2003 machine time
Solid lineGeant4 5.0 with
standard physics list
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Plan and Subjects of 2004
Establish technology to identify ions from Z=1 to Z=6
This is the major subjects of this year
Establish technology to determine energy/momentum of ions by
measuring multiple scattering and range
Continue data taking of 12C – water interactions
Continue to compare data with Geant4