|Title||Demonstration of low-loss electron beam transport and mm-wave experiments of the fusion-FEM|
|Publication Type||Journal Article|
|Year of Publication||1998|
|Authors||W.H Urbanus, W.A Bongers, G. van Dijk, C.AJ van der Geer, R. de Kruif, P. Manintveld, J. Pluygers, A.J Poelman, F.C Schüller, P.HM Smeets, A.B Sterk, A.GA Verhoeven, M. Valentini, M.J van der Wiel|
|Journal||Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment|
|Date Published||Apr 21|
In the Fusion-FEM electrostatic Free Electron Maser, an electron beam loss current of less than 0.2% is essential for long-pulse operation. At reduced beam current, 3 A instead of the nominal 12 A, we have demonstrated electron beam acceleration and transport through the undulator at current losses less than 0.02%. This paper summarizes the results of beam transport experiments and outlines the simple yet effective beam diagnostics system. The status of the mm-wave cavity and low-power measurements are given. It is shown that cavity characteristics, such as losses, bandwidth, frequency-tuning and feedback coefficient, can be checked in situ via the output window, by injecting a low power test-signal into the mm-wave system and analyzing the reflected signal. (C) 1998 Elsevier Science B.V. All rights reserved.
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