Patent ID: 8779697

Claim:
An RF cavity, comprising: a chamber, a conductive wall that encloses the chamber and has an inner side and an outer side, and a switch arrangement comprising a plurality of solid-state switches arranged around a circumference of the conductive wall around the chamber at a particular location along an axial length of the chamber, wherein the solid-state switches are connected to the conductive wall such that RF currents are induced in the conductive wall when the switch arrangement is activated, as a result of which RF power is coupled into the chamber of the RF cavity, and a ring-shared shielding device located on the outer side of the conductive wall and extending around the circumference of the RF cavity, the shielding device configured to increase the impedance of a propagation path of RF currents along the outer side of the conductive wall such that the RF currents coupled into the conductive wall are suppressed on the outer side of the conductive wall and directed to the inner side of the conductive wall.