High-gradient millimeter-wave accelerator on a planar dielectric substrate.
We report the first high-gradient studies of a millimeter-wave accelerator, employing for the first time a planar dielectric accelerator, powered by means of a 0.5-A, 300-MeV, 11.424-GHz drive electron beam, synchronous at the 8th harmonic, 91.392 GHz. Embedded in a ring-resonator circuit within the electron beam line vacuum, this structure was operated at 20 MeV/m, with a circulating power of 200 kW, for 2 x 10(5) pulses, with no sign of breakdown, dielectric charging, or other deleterious high-gradient phenomena. We also present the first measurement of the quadrupolar content of an accelerating mode.
Hill
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ME
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. marc@physics.harvard.edu
Adolphsen
C
C
Baumgartner
W
W
Callin
R S
RS
Lin
X E
XE
Seidel
M
M
Slaton
T
T
Whittum
D H
DH