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

被引：175

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

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 09期

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.

引用

页数：4

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