HERD Cosmic Ray Capability Requirement P(<A>~1) a.gi3 He(<A>~4) L(<A>~8) M(<A>~14) Model 1 d Model 2 H(<A>~25) 10 Light model Heavy Model ⅦH(<A>~35) Pe∨ Fe(<A>~56) 10 fev Detection limit: N= 10 events I PeV EXcept for L, up -h to PeV spectra w feasible with M 0.36m'Sr PeV Fe GF-2-3 in NouAu years 3sr discriminate HERD HERD between models TeV t03 eV 2HERD Cosmic Ray Capability Requirement P (<A> ~ 1) He (<A> ~ 4) L (<A> ~ 8) M (<A> ~ 14) H (<A> ~ 25) VH (<A> ~ 35) Fe (<A> ~ 56) Except for L, up to PeV spectra feasible with GF~2-3 in ~years: discriminate between models. N(E>E0; 2 yr) PeV PeV Model 1 Light model Model 2 Heavy Model TeV TeV PeV PeV HERD HERD Detection limit: N = 10 events 5/42