Experimental Study of Coaxial Free-Electron Maser Based on Two-Dimensional Distributed Feedback

Journal Article · Fri Jan 27 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.035002· OSTI ID:20776987

Konoplev, I V; McGrane, P; He, W; Cross, A W; Phelps, A D.R.; Whyte, C G; Ronald, K; Robertson, C W ^[1]

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1. SUPA, Department of Physics, University of Strathclyde, Glasgow G4 ONG (United Kingdom)

The first experimental study of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback is presented. A new type of cavity formed with coaxial 2D surface photonic band gap structures was used. The FEM was driven by a large diameter (7 cm), high-current (500 A), annular electron beam of energy 475 keV. By tuning the amplitude of the undulator or guide magnetic field, modes associated with the different band gaps of the 2D structures were excited. The Ka-band coaxial FEM generated 15 MW of radiation with a 6% conversion efficiency, in excellent agreement with theory.

• OSTI ID: 20776987
• Journal Information: Physical Review Letters, Vol. 96, Issue 3; Other Information: DOI: 10.1103/PhysRevLett.96.035002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRIC CURRENTS
ELECTRON BEAMS
ELECTRONS
FEEDBACK
FREE ELECTRON LASERS
KEV RANGE 100-1000
MAGNETIC FIELDS
MASERS
TWO-DIMENSIONAL CALCULATIONS
WIGGLER MAGNETS