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A design approach for a multistage depressed collector system for gyrotron is presented here. The new concept based on two steps: (i) the transformation of the cylindrical hollow beam to sheet beam and (ii) the sorting of the spent beam electrons on the electrodes, based on ExB approach, in order to achieve the optimal efficiency. The simulation results predict very high levels of efficiency (more...
Parasitic beam tunnel oscillations have been discovered on some of the series production gyrotrons for W7-X and also on the coaxial pre-prototype gyrotron for ITER. Solutions to remedy these problems have resulted in a modified beam tunnel design, technologically close to the existing beam tunnel. The new design has successfully been tested on both the coaxial and also the f-step-tunable gyrotrons...
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