1. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 TeV CR compositionwith GLAST TeV CR composition with GLAST Guido Barbiellini, Valter Bonvini, Mirko Boezio, Francesco Longo, Andrea Vacchi University and INFN, Trieste, Italy guido.barbiellini@ts.infn.it A.Deangelis et al. University of Udine and INFN, Trieste G.Busetto et al., University and INFN Padova P.Spinelli et al., University and INFN, Bari …

2. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 Outline Brief introduction –CR spectrum at the knee –ACCESS CR measurements at TeV –The concept (NUCLEON proposal) Preliminary calculations –Events per day with GLAST

3. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004

4. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 SNR shock acceleration E max ~  shock Ze x B x R shock –  E max ~ Z x 100 TeV with exponential cutoff of each component –But spectrum continues to higher energy:  E max problem

5. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 Knee of spectrum Differential spectral index changes at ~ 3 x 10 15 eV –    –Continues to 3 x 10 18 eV –Expect exp{-E / Z E max } cutoff for each Z Fine-tuning problem: –To match smoothly a new source with a steeper spectrum Knee

6. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 Speculation on the knee K-H Kampert et al., astro-ph/0204205 Total protons helium CNO Mg… Fe 1 1 Component:  = 2.7, E max = Z x 30 TeV; Emax = Z x 1 PeV 3 components  

7. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 Access

8. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 Access 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)

9. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 NUCLEON G.Bashindzhagyan et al. ICRC 2003

10. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 NUCLEON tests G.Bashindzhagyan et al. ICRC 2003

11. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 NUCLEON tests G.Bashindzhagyan et al. ICRC 2003

12. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 NUCLEON simulation A.N. Turundaevsky et al. ICRC 2003

13. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 GLAST for CR? CR spectrum: GLAST surface : ~3m 2 Solid Angle: ~ 2 steradians Energy of 1 event per day (with optimal efficiency) Energy of 1 event per 100 days (with optimal efficiency)

14. G.Barbiellini et al. TeV CR with GLAST GLAST LAT GLAST Italian SW meeting 11 march 2004 Work 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