Title :
Beam Line Design, Beam Alignment Procedure, and Initial Results for the

-Band Gain Experiment at Los Alamos
Author :
Carlsten, Bruce E. ; Earley, Lawrence M. ; Haynes, W. Brian ; Krawczyk, Frank L. ; Romero, Frank P. ; Russell, Steven J. ; Smirnova, Evgenya I. ; Wang, Zhi-Fu
Author_Institution :
Los Alamos Nat. Lab., NM
Abstract :
A gain experiment was performed at Los Alamos using a 120-keV 2-A cylindrical electron beam with a ridged waveguide slow-wave structure at 94 GHz, demonstrating 22 dB of amplification through a traveling-wave interaction. The structure was planar with a gap of 0.75 mm and a length of 5 cm. The 2-A electron beam was confined in a 3.2-kG axial magnetic field, with roughly a 0.5-mm diameter. The electron beam was aligned along the magnetic axis of the solenoid by scribing out its cyclotron motion on a novel optical diagnostic using a procedure that depends on varying the solenoidal field strength. The transport through the structure was verified by letting the beam drill holes in a series of thin metallic foils before insertion of the structure
Keywords :
beam handling techniques; electron beams; electron optics; millimetre wave tubes; particle beam diagnostics; ridge waveguides; slow wave structures; solenoids; 0.5 mm; 0.75 mm; 120 keV; 2 A; 22 dB; 3.2 kG; 5 cm; 94 GHz; W-band gain experiment; axial magnetic field; beam alignment procedure; beam line design; cylindrical electron beam; optical diagnostic; ridged waveguide slow-wave structure; solenoid magnetic axis; thin metallic foils; traveling-wave interaction; Cyclotrons; Electron beams; Electron optics; Electron tubes; Magnetic confinement; Magnetic fields; Microwave amplifiers; Optical waveguides; Performance gain; Solenoids; Electron beams; electron tubes; microwave amplifiers; millimeter-wave power amplifiers; traveling-wave tubes (TWTs);
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2006.883386