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Ahmed KM, Bekheit A, Abd Al-Halim M. Estimation of the scrape-off-layer width in tokamak using the electron balance equations. FUSION ENGINEERING AND DESIGN 2023. [DOI: 10.1016/j.fusengdes.2022.113339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Xi H, Wang J, He Z, Zhu G, Wang Y, Wang H, Chen Z, Li R, Liu L. Continuous-wave Y-band planar BWO with wide tunable bandwidth. Sci Rep 2018; 8:348. [PMID: 29321646 PMCID: PMC5762788 DOI: 10.1038/s41598-017-18740-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 12/17/2017] [Indexed: 11/09/2022] Open
Abstract
A high performance continuous-wave (CW) backward wave oscillator (BWO) with planar slow wave structure (SWS) and sheet electron beam in Y-band is presented in this paper. The mode selection is discussed by studying the dispersion curve of SWSs, distributions of the electric field, and particle-in-cell simulation results, showing that the designed BWO operates in the fundamental mode TM11. The planar SWSs are fabricated by using the UV-LIGA technology with the processing error less than 0.003 mm. The electron gun can provide the 2.5 mm × 0.14 mm sheet electron beam with maximum current density of 57 A/cm2 at the CW mode. Experimental results show that the developed BWO can operate in the fundamental mode TM11 and generate the state-of-art output power of 182 mW at the frequency of 0.3426 THz with a large frequency tuning range from 0.318 THz to 0.359 THz.
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Affiliation(s)
- Hongzhu Xi
- The Institute of Anhui Huadong photoelectric Technology, Wuhu, Anhui, 241002, China
| | - Jianguo Wang
- Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, 710024, China. .,Key Laboratory for Physical Electronics and Devices of Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, China.
| | - Zhaochang He
- The Institute of Anhui Huadong photoelectric Technology, Wuhu, Anhui, 241002, China
| | - Gang Zhu
- The Institute of Anhui Huadong photoelectric Technology, Wuhu, Anhui, 241002, China
| | - Yue Wang
- Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, 710024, China
| | - Hao Wang
- The Institute of Anhui Huadong photoelectric Technology, Wuhu, Anhui, 241002, China
| | - Zaigao Chen
- Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, 710024, China
| | - Rong Li
- The Institute of Anhui Huadong photoelectric Technology, Wuhu, Anhui, 241002, China
| | - Luwei Liu
- The Institute of Anhui Huadong photoelectric Technology, Wuhu, Anhui, 241002, China
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Lee W, Park HK, Lee DJ, Nam YU, Leem J, Kim TK. Design of a collective scattering system for small scale turbulence study in Korea Superconducting Tokamak Advanced Research. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:043501. [PMID: 27131668 DOI: 10.1063/1.4944834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The design characteristics of a multi-channel collective (or coherent) scattering system for small scale turbulence study in Korea Superconducting Tokamak Advanced Research (KSTAR), which is planned to be installed in 2017, are given in this paper. A few critical issues are discussed in depth such as the Faraday and Cotton-Mouton effects on the beam polarization, radial spatial resolution, probe beam frequency, polarization, and power. A proper and feasible optics with the 300 GHz probe beam, which was designed based on these issues, provides a simultaneous measurement of electron density fluctuations at four discrete poloidal wavenumbers up to 24 cm(-1). The upper limit corresponds to the normalized wavenumber kθρe of ∼0.15 in nominal KSTAR plasmas. To detect the scattered beam power and extract phase information, a quadrature detection system consisting of four-channel antenna/detector array and electronics will be employed.
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Affiliation(s)
- W Lee
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - H K Park
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - D J Lee
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - Y U Nam
- National Fusion Research Institute, Daejeon 34133, South Korea
| | - J Leem
- Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - T K Kim
- Kyunpook National University, Daegu 41566, South Korea
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Ono M, Bell M, Kaita R, Kugel H, Ahn JW, Allain J, Battaglia D, Bell R, Canik J, Ding S, Gerhardt S, Gray T, Guttenfelder W, Hosea J, Jaworski M, Kallman J, Kaye S, LeBlanc B, Maingi R, Mansfield D, McLean A, Menard J, Muller D, Nelson B, Nygren R, Paul S, Raman R, Ren Y, Ryan P, Sabbagh S, Scotti F, Skinner C, Soukhanovskii V, Surla V, Taylor C, Timberlake J, Yuh H, Zakharov L. Recent progress of NSTX lithium program and opportunities for magnetic fusion research. FUSION ENGINEERING AND DESIGN 2012. [DOI: 10.1016/j.fusengdes.2011.10.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Mattoo SK, Singh SK, Awasthi LM, Singh R, Kaw PK. Experimental observation of electron-temperature-gradient turbulence in a laboratory plasma. PHYSICAL REVIEW LETTERS 2012; 108:255007. [PMID: 23004612 DOI: 10.1103/physrevlett.108.255007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 11/09/2011] [Indexed: 06/01/2023]
Abstract
We report the observation of electron-temperature-gradient (ETG) driven turbulence in the laboratory plasma of a large volume plasma device. The removal of unutilized primary ionizing and nonthermal electrons from uniform density plasma and the imposition and control of the gradient in the electron temperature (T[Symbol: see text] T(e)) are all achieved by placing a large (2 m diameter) magnetic electron energy filter in the middle of the device. In the dressed plasma, the observed ETG turbulence in the lower hybrid range of frequencies ν = (1-80 kHz) is characterized by a broadband with a power law. The mean wave number k perpendicular ρ(e) = (0.1-0.2) satisfies the condition k perpendicular ρ(e) ≤ 1, where ρ(e) is the electron Larmor radius.
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Affiliation(s)
- S K Mattoo
- Institute for Plasma Research, Bhat, Gandhinagar 382 428, India
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