1
|
Affiliation(s)
- Gary Taylor
- Princeton University Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543
| |
Collapse
|
2
|
Shevchenko V, Cunningham G, Gurchenko A, Gusakov E, Lloyd B, O’Brien M, Saveliev A, Surkov A, Volpe F, Walsh M. Development of Electron Bernstein Wave Research in MAST. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1499] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- V. Shevchenko
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - G. Cunningham
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - A. Gurchenko
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - E. Gusakov
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - B. Lloyd
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - M. O’Brien
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - A. Saveliev
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - A. Surkov
- Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
| | - F. Volpe
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - M. Walsh
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| |
Collapse
|
3
|
Affiliation(s)
- A. E. Costley
- ITER Organization Cadarache, 13108 St Paul-Les-Durance Cedex, France
| |
Collapse
|
4
|
Affiliation(s)
| | | | - H. Park
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | | | - G. Taylor
- Princeton Plasma Physics Laboratory, Princeton, New Jersey
| | - C. X. Yu
- University of Science and Technology of China, Hefei, China
| |
Collapse
|
5
|
Yatsuka E, Kinjo K, Morikawa J, Ogawa Y. Radio-frequency electromagnetic field measurements for direct detection of electron Bernstein waves in a torus plasma. Rev Sci Instrum 2009; 80:023505. [PMID: 19256646 DOI: 10.1063/1.3082047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
To identify the mode-converted electron Bernstein wave (EBW) in a torus plasma directly, we have developed an interferometry system, in which a diagnostic microwave injected outside of the plasma column was directly detected with the probing antenna inserted into the plasma. In this work, plasma production and heating are achieved with 2.45 GHz, 2.5 kW electron cyclotron heating (ECH), whereas diagnostics are carried out with a lower power (10 W) separate frequency (1-2.1 GHz) microwave. Three components, i.e., two electromagnetic (toroidal and poloidal directions) and an electrostatic (if refractive index is sufficiently higher than unity, it corresponds to radial component), of ECRF electric field are simultaneously measured with three probing antennas, which are inserted into plasma. Selectivities of each component signal were checked experimentally. Excitation antennas have quite high selectivity of direction of linear polarization. As probing antennas for detecting electromagnetic components, we employed a monopole antenna with a length of 35 mm, and the separation of the poloidal (O-wave) and toroidal (X-wave) components of ECRF electric field could be available with this antenna. To detect EBW, which is an electrostatic wave, a small tip (1 mm) antenna was used. As the preliminary results, we detected signals that have three characteristics of EBW, i.e., short wavelength, backward propagation, and electrostatic.
Collapse
Affiliation(s)
- Eiichi Yatsuka
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8568, Japan
| | | | | | | |
Collapse
|
6
|
Xiang N, Cary JR. Second-harmonic generation of electron-bernstein waves in an inhomogeneous plasma. Phys Rev Lett 2008; 100:085002. [PMID: 18352631 DOI: 10.1103/physrevlett.100.085002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2007] [Indexed: 05/26/2023]
Abstract
In the injection of electron-Bernstein waves (EBW) into a plasma, proposed for plasma heating and current drive in over-dense plasma, conversion of the fundamental to its second harmonic is predicted analytically and observed in computations. The mechanism is traced to the existence of locations where one can have both wave number and frequency matching between the fundamental and its harmonic. Further, at such locations, the second harmonic commonly has minimal group velocity, and this allows the amplitude of the second harmonic to build to values exceeding that of the fundamental at power levels less than anticipated in experiments. The second-harmonic power can then be deposited at half-harmonic resonances of the original wave, often far from the desired location of energy deposition. Estimates for the power at which this is significant are given.
Collapse
Affiliation(s)
- Nong Xiang
- Center for Integrated Plasma Studies, University of Colorado at Boulder, Boulder, Colorado 80309, USA.
| | | |
Collapse
|
7
|
Yatsuka E, Kato H, Sakata D, Morikawa J, Ogawa Y, Yanagi N, Mito T. Electron Bernstein Wave Heating on the Internal Coil Device Mini-RT. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- E. Yatsuka
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwashi, Chiba, 277-8561
| | - H. Kato
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwashi, Chiba, 277-8561
| | - D. Sakata
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwashi, Chiba, 277-8561
| | - J. Morikawa
- School of Engineering, University of Tokyo, 2-11-16, Yayoi, Bunkyo Ward, Tokyo, 113-8656
| | - Y. Ogawa
- High Temperature Plasma Center, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwashi, Chiba, 277-8568
| | - N. Yanagi
- National Institute for Fusion Science, 322-6, Oroshicho, Toki, Gifu, 509-5292
| | - T. Mito
- National Institute for Fusion Science, 322-6, Oroshicho, Toki, Gifu, 509-5292
| |
Collapse
|
8
|
Shiraiwa S, Hanada K, Hasegawa M, Idei H, Kasahara H, Mitarai O, Nakamura K, Nishino N, Nozato H, Sakamoto M, Sasaki K, Sato K, Takase Y, Yamada T, Zushi H. Heating by an electron Bernstein wave in a spherical tokamak plasma via mode conversion. Phys Rev Lett 2006; 96:185003. [PMID: 16712369 DOI: 10.1103/physrevlett.96.185003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Indexed: 05/09/2023]
Abstract
The first successful high power heating of a high dielectric constant spherical tokamak plasma by an electron Bernstein wave (EBW) is reported. An EBW was excited by mode conversion (MC) of an mode cyclotron wave injected from the low magnetic field side of the TST-2 spherical tokamak. Evidence of electron heating was observed as increases in the stored energy and soft x-ray emission. The increased emission was concentrated in the plasma core region. A heating efficiency of over 50% was achieved, when the density gradient in the MC region was sufficiently steep.
Collapse
Affiliation(s)
- S Shiraiwa
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa 277-8561, Japan.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|