"Smile": A Self Magnetically Insulated Transmission Line Adder For The 8-stage Radlac II Accelerator

The RADLAC II Self Magnetically Insulated Transmission Line "SMILE" is a coaxial wave guide structure that is composed of two regions: -a) a 9.5-m voltage adder and b) a 3-m long extension section. The adder section provides for the addition of the input voltages from the individual water-dielectric pulse forming line feeds. The extension section isolates the adder from the magnetically immersed foilless diode electron source load and efficiently transports the pulsed power out from the deionized water tank of the device. The SMILE modification of the RADLAC II accelerator enabled us to produce high quality beams of up to 14 MV, 100 kA. The design and the experimental evaluation of SMILE will be presented and compared with numerical simulation predictions.