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Purpose of the Experiment

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.

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Purpose of the Experiment

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  1. The P152 Experiment at NIRSOverview 1st Workshop of the Italy-Japan Collaborationon Geant4 Medical Application8-9 March 2004INFN GenovaKatsuya AmakoKEK

  2. 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.

  3. 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….

  4. 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

  5. HIMAC Overview RFQ Linac 800 KeV/u Alvarez Linac 6 MeV/u Synchrotron 800 MeV/u Experiment Areas Ion Beams He, N, C, O, Ne, Si, Ar, etc

  6. ECC and Emulsion Film • Emulsion Film (Standard: Opera Film) • ECC (Emulsion Cloud Chamber) 12.5 cm 10 cm Thickness 288 m 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.

  7. Opera Film Structure (Cross section view) Emulsion Layer (Sensitive area) 44 mm 44 mm 200 mm Emulsion Layer (Sensitive area) TAC – Film Base (not sensitive) Particle path

  8. Auto Scanning Machine ( Nagoya Univ.) films Scanning Speed ~7 hours /1 film (both film sides, ~20,000 tracks) Spatial Resolution ~ 1 mm Angular Resolution ~ 1 mrad Head of scanning machine (microscope + CCD)

  9. Track Reconstruction 2 cm Beam Track Reconstruction 135 MeV/u 12C beam Total track# ~ 20,000 [Note] Each film layer is colored in thecyclic sequence of violet,indigo,blue,green, yellow,orange,red 2 cm Film# 65 Film# 100

  10. Z=1 Z=2 Z=6 Z=1 Z=2 Prelimiary Z>2 Z=2 Z=1 MIP Particle ID • Particle can be identified by the grain density of track (ionization density) ~300 m • Need some improvement to separate particles with z>2. ionization/grain density

  11. 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

  12. Geant4 Simulation ECC Beam Line Elements

  13. Range Struggling of 12C in ECC and Geant4 • Point with error bars data from June 2003 machine time • Solid line Geant4 5.0 with standard physics list

  14. 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

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