glast hiroshima university, isas cosmic-ray source generator y.fukazawa (hiroshima u) m.ozaki(isas)...
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GLASTGLASTHiroshima University, ISAS
Cosmic-Ray Source Generator
Y.Fukazawa (Hiroshima U)
M.Ozaki(ISAS)
T.Mizuno(Hiroshima U)
S.Hirano(Hiroshima U)
T.Kamae(Hiroshima U/SLAC)
GLASTGLASTHiroshima University, ISAS
Cosmic-Ray Source Generator is required for
・ Balloon Flight Calibration
to predict a counting rate of π0 decay Gamma-ray and Background
・ Science Analysis after launch
to simulate and estimate the onboard background
study of diffuse gamma-ray emission
detection of faint gamma-ray sources
especially for
(Simulator)
GLASTGLASTHiroshima University, ISAS
Cosmic-Ray
accelerated by young SNRs, Pulsars, or other sites
modulated by Solar Wind
cut-off by magnetic field of the Earth
Generation of secondary components in the Air
inject into satellites or balloons
become the residual background by primary electrions or secondary particles and gamma-rays
propagate in the interstellar space
GLASTGLASTHiroshima University, ISAS
ProtonsAMS Measurements ….. Primary and Secondary
for various geomagnetic latitude
GLASTGLASTHiroshima University, ISAS
40E-2.79exp(-(E/20)-0.1-(E/3.96)-2.5)
3x10-3E-2.5exp(-(E/0.16)-1)
Primary
Secondary
GLASTGLASTHiroshima University, ISAS
ElectronsInformation is not so enough as protons
Primary Electrons
Komori et al. 1999 Verma et al. 1967
Secondary
GLASTGLASTHiroshima University, ISAS
0.723(E+1.1)-3.33x((E+mc2)2-(mc2)2)/((E+mc2+(1.1)2)/(1+(E/4.27)-12.0
0.028E-1.44/(1+(E/0.90)1.35) … re-entrant0.073E-1.29/(1+(E/0.90)1.50) … splash
Primary
Secondary
Solar modulation formula
geomagnetic cutoff
Komori 1999
Verma et al. modified
(Gleeson and Axford 1968)
GLASTGLASTHiroshima University, ISAS
Incident Angle Distribution(1+0.6sin(theta)) sin(theta)d(theta)
Pimary … theta<90°
GLASTGLASTHiroshima University, ISAS
Further developements …..
Support arbitral solar modulation and geomagnetic cutoff.Include Helium and other ions.
Improve the incident angle distribution (theta, phi).
Parallel StudiesResidual background due to the cosmic-rays
Improve the secondary components (intensity etc)
Current StatusSupporting the Balloon Flight experiments (various parameters are fixed for the balloon).
Summary
GLASTGLASTHiroshima University, ISAS
GLASTGLASTHiroshima University, ISAS
GLASTGLASTHiroshima University, ISAS
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