A plasma generation system is disclosed that includes a plasma generator and a magnetic field generator. The plasma generator includes a plasma chamber having a longitudinal Z-pinch axis. The plasma generator is configured to generate a Z-pinch plasma along the Z-pinch axis within the plasma chamber. The magnetic field generator is arranged with respect to the plasma generator and configured to generate, after the Z-pinch plasma is formed, a Z-pinch-stabilizing magnetic field extending longitudinally within the plasma chamber for stabilizing and compressing the Z-pinch plasma.

The present invention concerns a polymer substrate bearing a decorative coating comprising a protective toplayer of boron doped silicon oxide, wherein the boron doped silicon oxide comprises Si, O, B, H and OH groups and wherein the boron content is comprised between 4 and 12 atomic %. The present invention further comprises a process for depositing on a polymer substrate by linear hollow cathode type PECVD a boron doped silicon oxide layer comprising Si, O, B, H and OH groups and wherein the boron content is comprised between 4 and 12 atomic %.