CPI Gyrotrons For Fusion EC Heating

A gyrotron, the VGT‐8115, has been constructed and partially tested at CPI with the goal of producing 1.5 MW CW output at 110 GHz. Contributions to the design were made by MIT, University of Maryland, University of Wisconsin, Calabasas Creek Research, and General Atomics. The development effort is funded by the U.S. Department of Energy. The CW design is based on short pulse experiments at MIT and long pulse experience with a previous 1 MW CPI gyrotron, the VGT‐8110. The design and the recent test results for the VGT‐8115 will be discussed. Recent activity with the VGT‐8110 gyrotrons at General Atomics and at CPI will also be discussed. Recent test results with the 140 GHz, 1 MW, VGT‐8141 gyrotron installed at IPP Greifswald will be summarized. The basic configuration of the VGT‐8115 is similar to previous CPI gyrotrons. A diode magnetron injection gun is used to produce a 96 kV, 40 A beam to interact with a TE22,6,1 cavity. The output uses a dimpled launcher, four beam shaping mirrors, and a single disc ...