Paper Title: Collapsing Magnetic Trap Model for Coronal HXR Sources Author List: Somov, B., Bogachev, S. Abstract: I would like to review the physical processes (the Fermi acceleration and betatron acceleration of electrons and ions, Coulomb collisions, HXR emission) in collapsing magnetic traps generated by fast reconnection in super-hot turbulent-current layers in flares. The main attension will be paid to the observational predictions of the model and possibilities to compare these predictions with the RHESSI observations.