tev cr composition with glast
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G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
TeV CR compositionTeV CR composition with GLASTwith GLAST Guido Barbiellini, Valter Bonvini, Mirko Boezio, Francesco Longo, Andrea VacchiUniversity and INFN, Trieste, Italyguido.barbiellini@ts.infn.itA.Deangelis et al. University of Udine and INFN, TriesteG.Busetto et al., University and INFN PadovaP.Spinelli et al., University and INFN, Bari…
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
OutlineOutline
• Brief introduction– CR spectrum at the knee– ACCESS
• CR measurements at TeV– The concept (NUCLEON proposal)
• Preliminary calculations– Events per day with GLAST
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
SNR shock accelerationSNR shock acceleration
• Emax ~ shock Ze x B x Rshock
Emax ~ Z x 100 TeV with exponential cutoff of each component
– But spectrum continues to higher energy: Emax problem
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
Knee of spectrumKnee of spectrum
• Differential spectral index changes at ~ 3 x 1015eV
– – Continues to 3 x 1018 eV
– Expect exp{-E / Z Emax} cutoff for each Z
• Fine-tuning problem:
– To match smoothly a new source with a steeper spectrum
Knee
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
Speculation on the kneeSpeculation on the knee
K-H Kampert et al., astro-ph/0204205
Total
protons
helium
CNO
Mg…
Fe
1 1 Component: = 2.7, Emax = Z x 30 TeV; Emax = Z x 1 PeV
3 components
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
AccessAccess
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
AccessAccess
• Element identifier dimensions: 2m x 2m x 0.3m – Silicon solid state detector array 4 layers – Aerogel Cherenkov detector – Plastic Cherenkov detector – Scintillating optical fiber hodoscope
• Relativistic velocity identifier dimensions: 1.7m x 1.7m x 1.2m – Transition radiation (TR) detector composed of
• 6 layers of TR radiating blankets • 12 layers of Xe filled proportional tubes
• Energy identifier dimensions: 1m x 1m x 0.8m – One interaction length of carbon target – 30 radiation lengths of BGO (Bismuth germanate
scintillator)
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
NUCLEON NUCLEON
G.Bashindzhagyan et al. ICRC 2003
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
NUCLEON testsNUCLEON tests
G.Bashindzhagyan et al. ICRC 2003
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
NUCLEON testsNUCLEON tests
G.Bashindzhagyan et al. ICRC 2003
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
NUCLEON simulationNUCLEON simulation
A.N. Turundaevsky et al. ICRC 2003
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
GLAST for CR?GLAST for CR?
• CR spectrum:
• GLAST surface : ~3m2
• Solid Angle: ~ 2 steradians• Energy of 1 event per day
(with optimal efficiency)• Energy of 1 event per 100 days
(with optimal efficiency)
7.211124105.1 GeVEGeVstsm
GeVE
E
E
GeV
GeV
3
10547.2
105
10log7.2
10106105.1
GeVE
E
E
GeV
GeV
4
12747.2
103
12log7.2
10106105.1
G.Barbiellini et al. TeV CR with GLAST
GLAST LAT GLAST Italian SW meeting 11 march 2004
Work in progressWork in progress
• The concept– Charge by dE/dx before interaction– Energy deposit and secondary transverse profile after
interaction• GLAST simulation
– G3 preliminary (with CR interaction)– G4 full with trigger
• Test Beam evaluation• Caveats
– Efficiency– Electronics
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