Predicted operating conditions for maintaining mode purity in the 1MW 200 GHz FOM free electron maser

Conference · Thu Sep 01 04:00:00 EDT 1994

OSTI ID:57195

Caplan, M ^[1]; Antonsen, T; Levush, B ^[2]; Tulupov, A; Urbanus, W ^[3]

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1. Lawrence Livermore National Lab., CA (United States)
2. Univ. of Maryland, College Park, MD (United States). Institute for Plasma Physics
3. FOM Institut voor Plasmafysica, Nieuwegein (Netherlands)

A Free Electron Maser (FEM) Oscillator is now under construction at the FOM Institute, (Rijnhuisen) Netherlands with the goal of producing 1MW long pulse to CW microwave output in the range 130 GHz to 250 GHz with, application to plasma heating. A newly developed multi-frequency FEM simulation code (MALT 1D) using the windows approximation in the high gain regime and including AC space charge is used to model possibilities for longitudinal mode completion and resulting non-stationary chaotic output. The code predicts that stationary single frequency output can be obtained by taking advantage of the frequency dependence of the feedback reflection coefficient and by optimizing the gap spacing between the two wiggler sections.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 57195
• Report Number(s): UCRL-JC--118397; CONF-9408146--20; ON: DE95010795
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FREE ELECTRON LASERS
MASERS
MODE CONTROL
OSCILLATION MODES