Observation of Narrow-Band Terahertz Coherent Cherenkov Radiation from a Cylindrical Dielectric-Lined Waveguide

被引:174
作者
Cook, A. M. [1 ]
Tikhoplav, R. [1 ]
Tochitsky, S. Y. [2 ]
Travish, G. [1 ]
Williams, O. B. [1 ]
Rosenzweig, J. B. [1 ]
机构
[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA
关键词
CERENKOV; GENERATION; OPERATION; MASER; FIELD; FEL;
D O I
10.1103/PhysRevLett.103.095003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report experimental observation of narrow-band coherent Cherenkov radiation driven by a subpicosecond electron bunch traveling along the axis of a hollow cylindrical dielectric-lined waveguide. For an appropriate choice of dielectric wall thickness, a short-pulse beam current profile excites only the fundamental mode of the structure, producing energetic pulses in the terahertz range. We present detailed measurements showing a narrow emission spectrum peaked at 367 +/- 3 GHz from a 1 cm long fused silica capillary tube with submillimeter transverse dimensions, closely matching predictions. We demonstrate a 100 GHz shift in the emitted central frequency when the tube wall thickness is changed by 50 mu m. Calibrated measurements of the radiated energy indicate up to 10 mu J per 60 ps pulse for an incident beam charge of 200 pC, corresponding to a peak power of approximately 150 kW.
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页数:4
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