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We use a simple elastic Hamiltonian for the vortex lattice in a weak impuritybackground which includes defects in the form of integer-valued fields tocalculate the free energy of a vortex lattice in the deep H_{c2} region. Thephase diagram in this regime is obtained by applying the variational approachof M{\'e}zard and Parisi developed for random manifolds. We find a first-orderline between the Bragg-glass and vortex-glass phase as a continuation of themelting line. In the liquid phase, we obtain an almost vertical third-orderglass transition line near the critical temperature in the H-T plane.Furthermore, we find an almost vertical second-order phase transition line inthe Bragg-glass as well as the vortex-glass phases which crosses thefirst-order Bragg-glass, vortex-glass transition line. We calculate the jump ofthe temperature derivate of the induction field across this second-order lineas well as the entropy and magnetic field jumps across the first-order line.

Phase Diagram of Vortices in High-T_c Superconductors with a Melting Line in the deep H_{c2} Region