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Study of Position Sensitive E-E for Space Particle Telescope Pre-results of Geant4 simulation 张云龙，王文骁，李翠

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Motivation Study of space science is in need of information of space particle(nuclide/ion). Important parameters: energy spectrum of particle and particle flux. First of all, identify particles. (Reconstruct Z and M in simulation.)

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Particle identification Bethe-Bloch formula: Energy loss of incident particle could be described by Bethe-Bloch formula. Due to ionization, particle will deposit energy in detector, and detector can output signal. The value of output signal in detector relevant to the incident particle’s charge, kinetic energy and so on. With measured detector’s signal, the particle’s charge and mass could be identified.

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Telescope model Elements’ thickness: First: 50 m Second: 192 m Third: 248 m BGO: 63mm 63mm 40mm BGO Silicon detector z x y

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H1H2H3 /gps/source/clear /gps/source/add 1 /gps/particle proton /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 200. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn /gps/source/clear /gps/source/add 1 /gps/particle ion /gps/ion /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 200. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn /gps/source/clear /gps/source/add 1 /gps/particle ion /gps/ion /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 200. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn 20000

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Energy deposit in each Si Layer and BGO H1

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Energy deposit in each Si Layer and BGO H2

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Energy deposit in each Si Layer and BGO H3

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E VS Kinetic energy

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He3He4 /gps/source/clear /gps/source/add 1 /gps/particle alpha #/gps/ion /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 400. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn /gps/source/clear /gps/source/add 1 /gps/particle ion /gps/ion /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 400. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn 20000

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Energy deposit in each Si Layer and BGO He3

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Energy deposit in each Si Layer and BGO He4

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E VS Kinetic energy

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Li6Li7 /gps/source/clear /gps/source/add 1 /gps/particle ion /gps/ion /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta 0.01 deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 400. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn /gps/source/clear /gps/source/add 1 /gps/particle ion /gps/ion /gps/pos/type Point /gps/pos/centre cm /gps/ang/type iso /gps/ang/mintheta 0.00 deg /gps/ang/maxtheta 0.01 deg /gps/ene/type Lin /gps/ene/min 0. MeV /gps/ene/max 500. MeV /gps/ene/gradient 0. /gps/ene/intercept 1. /run/beamOn 10000

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Energy deposit in each Si Layer and BGO Li6

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Energy deposit in each Si Layer and BGO Li7

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E VS Kinetic energy

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Be7Be9Be10

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B10B11

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C12C13C14

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Reconstruct Z NUCLEAR INSTRUMENTS AND METHODS 145(1977) The final calculated particle identification value “PI”, approximately (AZ 2 ) 1/3

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PI calculation T1: thickness of E detector E1: E E2: total energy

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Reconstruct Z H1 H2H3 He3He4 Li6 Li7 Be B C

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Reconstruct M Once the charge (Z) has been identified, the mass M of the specific isotope can be reconstructed by means of the equation: A precise evaluation of such parameters a and b for each atomic species has been obtained by a fit of the following expression: R: the measured range E: kinetic energy a: is a constant of the medium b: [1.5, 1.8] NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH A 424(1999)

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Measured range VS Kinetic energy proton alpha Li Be

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Measured range VS Kinetic energy BC

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Values of a&b

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mass H1H2 H3 He3 He4

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mass Li6Li7 Be7Be9 Be10 B10 B11 C12C13 C14

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