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. Author manuscript; available in PMC: 2011 Apr 19.
Published in final edited form as: Phys Rev Lett. 2010 Sep 20;105(13):135101. doi: 10.1103/PhysRevLett.105.135101

FIG. 1.

FIG. 1

(color online). Dispersion diagram of HE06 gyro-TWT in a confocal waveguide (left) and cross sectional view (right). The annular electron beam has a 4.2 mm diameter.