is now generally accepted that upon increasing temperature at low magnetic fields, a sharp first order melting transition exists[@Liang; @Schilling; @Khaykovich; @Nishizaki; @Bouquet] from an elastically distorted vortex lattice, known as the “Bragg glass,"[@Giamarchi; @Nattermann; @FisherBG] to a disordered vortex liquid. However many other aspects of the vortex phase diagram remain in dispute. At low temperatures, increasing the magnetic field leads to a first order transition from the Bragg glass to a disordered vortex state.[@vanderBeek; @Gaifullin] It was originally believed that a special critical point separated the low field thermally induced vortex lattice melting from the high field disorder (random pin) induced melting.[@Khaykovich; @Nishizaki; @Bouquet] However later work[@vanderBeek; @Gaifullin; @Avraham; @Radzyner; @LiWen] argued for a single unified first order phase boundary for the vortex lattice, continuing smoothly down to low temperatures. At low temperatures and high magnetic fields, where the vortex lines are spatially disordered, a “vortex glass" phase has been proposed.[@FFH; @Scheidl] It remains in question whether this vortex glass is a truly distinct thermodynamic state with true superconducting phase coherence,[@Petrean; @Andersson] separated from the vortex liquid by a continuous second order phase transition, or whether there is just a crossover to a highly viscous vortex liquid upon decreasing 