Terahertz gyrotron broadband tuning based on local field shaping in a low-q cavity
文献类型：期刊论文
| 作者 | Li, Zheng-Di1,2; Du, Chao-Hai3; Luo, Li1,2; Qi, Xiang-Bo3; Liu, Pu-Kun3 |
| 刊名 | Ieee transactions on electron devices
 |
| 出版日期 | 2016-10-01 |
| 卷号 | 63期号:10页码:4081-4087 |
| 关键词 | Dynamic nuclear polarization (dnp) Low-q cavity Nuclear magnetic resonance (nmr) Second harmonic Terahertz (thz) Tunable gyrotron Ultralow voltage |
| ISSN号 | 0018-9383 |
| DOI | 10.1109/ted.2016.2596303 |
| 通讯作者 | Liu, pu-kun(pkliu@pku.edu.cn) |
| 英文摘要 | Terahertz (thz) gyrotron with broadband tuning capability is attractive for advanced applications, such as dynamic nuclear polarization enhanced nuclear magnetic resonance (dnp-nmr). however, it is challenging to realize broadband continuous frequency tuning (cft) in a conventional open cavity, in which the quality (q) factor scaling law results in abrupt axial-mode q-factor differences and narrow tuning range because of power switch off during higher order axial mode transition. in this paper, a novel cavity scheme based on formation of a local field is proposed to break the q-factor scaling law and expand the cft band. the field shaping with a local standing-wave formation is constructive in enhancing the q factor of high-order axial modes in a low-q open cavity, which obviously extends the cft band and simultaneously reduces ohmic loss. besides, a nonlinear up-tapered section of a parabolic-tapered waveguide is applied to reduce the power fluctuation in the axial mode transition process. in the preliminary design, a cft band wider than 2 ghz with a minimum output power of 1 w is theoretically demonstrated in the te8,2 mode 0.33-thz second-harmonic dnp-gyrotron with an ultralow voltage of 2.1 kv via magnetic field tuning. |
| WOS关键词 | DYNAMIC NUCLEAR-POLARIZATION ; OPERATION ; NMR ; OSCILLATOR |
| WOS研究方向 | Engineering ; Physics |
| WOS类目 | Engineering, Electrical & Electronic ; Physics, Applied |
| 语种 | 英语 |
| WOS记录号 | WOS:000384575700039 |
| 出版者 | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2375072 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Liu, Pu-Kun |
| 作者单位 | 1.Chinese Acad Sci, Inst Elect, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Peking Univ, Sch Elect Engn & Comp Sci, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Zheng-Di,Du, Chao-Hai,Luo, Li,et al. Terahertz gyrotron broadband tuning based on local field shaping in a low-q cavity[J]. Ieee transactions on electron devices,2016,63(10):4081-4087. |
| APA | Li, Zheng-Di,Du, Chao-Hai,Luo, Li,Qi, Xiang-Bo,&Liu, Pu-Kun.(2016).Terahertz gyrotron broadband tuning based on local field shaping in a low-q cavity.Ieee transactions on electron devices,63(10),4081-4087. |
| MLA | Li, Zheng-Di,et al."Terahertz gyrotron broadband tuning based on local field shaping in a low-q cavity".Ieee transactions on electron devices 63.10(2016):4081-4087. |
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来源：中国科学院大学
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