Charge accumulated in a capacitor is used to allow a processing current to flow between a target and an electrode. A session identifier is placed within the TCP packet to enable a new mechanism of load distribution and connection grouping within a load balancing system. Each of the first and second front leg straps has a first end and a second end. In this fashion a virtual axis at the tip of the second bender is created. A mixer structure mixes the biogas and air prior to the mixture being supplied to the burner. Quadrangular frustoidal convexities are formed in rows and columns on a single crystal silicon wafer by anisotropic wet etching, then a photonic crystal filter element is formed as an optical element on the protruding end face of each convexity, and the wafer is cut for each optical element into individual optical element chips.