Microwave system for the microwave tokamak experiment (MTX)

The microwave system for the Microwave Tokamak Experiment (MTX) will include part of the Lower Hybrid Heating (LHH) system used at Massachusetts Institute of Technology (MIT) on the Alcator machine and the new Free Electron Laser (FEL) microwave system being developed at LLNL. The LHH system for MTX will be two carts of four klystrons, each with a nominal total power of 2.1 MW at 4.6 GHz. The FEL system will deliver 2-MW average power at 250 GHz. 50 ns pulses every 200 μs of 8 gigawatt peak power will deliver the 2-MW average power. This paper will present both the LHH system from MIT and the FEL transmission system, which includes the master oscillator, launch into the FEL, mirrors, and transport system into the MTX. The microwave transmission system, microwave beam diagnostics, present design status, and other related issues will be presented. The MTX joins two devices, ETA-II and Alcator-C, through a beamline. 4 figs., 4 tabs