Demonstration of low-loss electron beam transport and mm-wave experiments of the fusion-FEM

TitleDemonstration of low-loss electron beam transport and mm-wave experiments of the fusion-FEM
Publication TypeJournal Article
Year of Publication1998
AuthorsW.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
JournalNuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment
Date PublishedApr 21
ISBN Number0168-9002

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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