  We describe experiments and simulations of dynamical merging with two Taylor
state plasmas in the SSX device. Taylor states are formed by magnetized plasma
guns at opposite ends of the device. We have performed experiments with Taylor
states of either sense of magnetic helicity (right-handed twist or left-handed
twist). We present results of both counter-helicity merging (one side
left-handed, the other right-handed) and co-helicity merging (both sides
left-handed). Experiments show significant ion heating, consistent with
magnetic reconnection. Magnetohydrodynamic simulations of these experiments
reveal the structure of the final relaxed, merged state.
