1998 Fiscal Year Annual Research Report

自発励起アルベン波動による高エネルギーイオンの散乱

Research Project

Project/Area Number	10480097
Research Institution	University of Tsukuba
Principal Investigator	市村真筑波大学, 物理工学系, 助教授 (10151482)
Co-Investigator(Kenkyū-buntansha)	斉藤輝雄筑波大学, 物理学系, 助教授 (80143163)
Keywords	自発励起アルベン波動 / 高エネルギーイオン / ピッチ角分布 / 磁場揺動 / アルベンイオンサイクロトロン波動 / 境界条件 / 温度非等方性
Research Abstract	プラズマ中に存在する低周波領域(<1 MHz)からイオンサイクロトロン周波数領域に渡って観測される磁場揺動に関して、その励起と相関を持つ高エネルギーイオンの損失が報告されている。タンデムミラー型装置ガンマ10においては、磁気プローブ等の測定により、温度の非等方性に起因するアルペンイオンサイクロトロン(AIC)波動と低周波数領域のグローバルアルべン波動に対応する磁場揺動が励起されることが明らかとなっている。本課題では、高エネルギーイオンの振舞を調べる為に、磁力線に沿って開放端部から損失するイオン計測に加えてセントラル部中央面でのイオンのピッチ角分布計測が可能な半導体検出器を用いた計測器を開発した。現在までに、揺動と相関を持った高エネルギーイオンの信号とそのピッチ角依存性が観測されている。プラズマ中に自発的に励起される揺動の励起条件とその空間構造は、高エネルギーイオンの散乱による損失を防ぐ上で重要である。本課題では、プラズマ中のアルベン固有モードが、主にプラズマパラメタに強く依存した境界条件によって励起されることに着目した。外部から積極的に波動を入射し、アンテナ負荷や励起される波動等の応答から、プラズマの巨視的パラメタを推定することを試みた。ガンマ10アンカー部にイオンサイクロトロン周波数の0.7〜0.9倍の高周波を入射して、アンテナ負荷の測定と励起波動の検出を行った。理論的にAIC波動が成長する周波数帯でのアンテナ負荷の減少と、共鳴的な磁場揺動の励起が観測された。磁場方向のプラズマパラメタに強く依存した境界条件を持つAIC波動の自発励起が示唆されている。

Research Products
(24 results)

All Other

All Publications (24 results)

[Publications] A.Mase,T.Tokuzawa,et al.: "Density Profile and Fluctuation Measurements Using Microwave Reflectometry" Journal of Plasma and Fusion Research. 74・10. 1189-1200 (1998)
[Publications] Y. Kiwamoto,Y.Kikuchi,et al.: "Pinhole Camera Imaging of X Rays and Energetic Neutral Atoms for Hot Plasma Diagnostics" Rev.Sci.Instrum.69・6. 2574-2575 (1998)
[Publications] S.Tanaka,M.Ichimura,et al.: "Macroscopic Stability Control Experiments with Phased Antennas in the GAMMA 10 Tandem Mirror" Journal of the Physical Society of Japan. 67・6. 1963-1967 (1998)
[Publications] K.Yatsu,L.G.Bruskin,et al.: "Experimental Study of Potential Confinement of ICRF-Heated Plasma in GAMMA 10" Journal of Plasma and Fusion Research. 74・8. 844-849 (1998)
[Publications] K.Yatsu,L.G.Bruskin,et al.: "Plasma Confinement in the GAMMA 10 Tandem Mirror" 17th IAEA Fusion Energy Conference,Yokohama. IAEA-CN-69. EX4/6 (1998)
[Publications] M.Ichimura,H.Hojo,et al.: "Characteristics of Hot Ions with a Strong RF Heating in the GAMMA 10 Tandem Mirror" 17th IAEA Fusion Energy Conference,Yokohama. IAEA-CN-69. EX4/8 (1998)
[Publications] M.Ichimura,S.Kanazawa,et al.: "ICEF Antenna Arrangement for Axisymmetric Plasma Formation in the GAMMA 10 Tandem Mirror" 1998 ICPP & 25th EPS Conf.on Contr.Fusion and Plasma Physics,Praba,. 22C. 1292-1295 (1998)
[Publications] K.Kajiwara,T.Saito,et al.: "Validity of a Model Electron Distribution Function in an End Region of a Tandem Mirror" Journal of The Physical Society of Japan. 67・10. 3647-3648 (1998)
[Publications] I.Katanuma,Y.Kiwamoto,et al.: "On the plug potential profile in a tandem mirror" Physics of Plasmas. 5・5. 1560-1562 (1998)
[Publications] Y.Nakashima,Y.Hasegawa,et al.: "Charge-exchange neutral particle measurements on electron cyclotron resonance heating experiments in hot-ion-mode plasmas of the GAMMA 10 tandem mirror" Review of Scientific Instruments. 70・1. 849-852 (1999)
[Publications] Y.Kogi,A.Mase,et al.: "Cross-polarization scattering from low-frequency electromagnetic waves in the GAMMA 10 tandem mirror" Review of Scientific Instruments. 70・1. 991-994 (1999)
[Publications] M.Ichimura,C.Satake,et al.: "Behaviour of High Energy Ions in the GAMMA 10 Tandem Mirror," Review of Scientific Instruments. 70・1. 834-837 (1999)
[Publications] S.Tanaka,M.Ichimura,et al.: "Low Frequency Fluctuations Measured by Probes in the GAMMA 10 Tandem Mirror" Review of Scientific Instruments. 70・1. 979-982 (1999)
[Publications] T.Goro,K.Ishii,et al.: "New typeof compact electrostatic energy analyzer adequate to measurement of charge exchange neutral particles with a low counting yield" Review of Scientific Instruments. 70・1. 845-848 (1999)
[Publications] K.Ishii,T.Goto,et al.: "Ion Transport in Velocity Space due to Alfven-Ion-Cyclotron Fluctuations Excited in the RF Driven Tandem Mirror Plasma" transactions of fusion technology. 35・1T. 175-179 (1999)
[Publications] K.Yatsu,L.G.Bruskin,et al.: "Recent Results of Experiments on Tandem Mirror GAMMA 10" transactions of fusion technology. 35・1T. 52-59 (1999)
[Publications] A.Mase,T.Tokuzawa,et al.: "Density Profile and Fluctuation Measurements with Microwave Reflectometry on GAMMA 10" transactions of fusion technology. 35・1T. 210-214 (1999)
[Publications] T.Saito,Y.Tatematsu,et al.: "Measurement and Control of End Loss Electrons from the GAMMA 10 Tandem Mirror" transactions of fusion technology. 35・1T. 233-237 (1999)
[Publications] H.Hojo,M.Nakamura,et al.: "Effects of Alfven Ion Cyclotron Modes on Tandem Mirror Energy Transport" to be published in Journal of Plasma and Fusion Research. 75・3. (1999)
[Publications] M.Nakamura,M.Ichimura,et al.: "Alfven wave excitation due to pressure anisotropy in the GAMMA 10 tandem mirror" to be published in Journal of Plasmaand Fusion Research. (1999)
[Publications] Y.Nakashima,K.Yatsu,et al.: "Plasma Confinement and Behavior of Plasma in the Minimum-B Region of the GAMMA 10 Tandem Mirror" to be published in Journal of Plasmaand Fusion Research. 75・3. (1999)
[Publications] T.Saito,M.Ichimura,et al.: "Enhanced axial loss of electrons from a tandem mirror induced by an Alfven ion cyclotron wave" Physical Review Letters. 82・6. 1169-1172 (1999)
[Publications] K.Yatsu,T.Cho,et al.: "Reduction of Radial Loss by Conducting Plates Installed in Anchor Region of GAMMA 10" to be published in Chinese Physics Letters. (1999)
[Publications] H.Hojo,M.Nakamura,et al.: "Tandem Mirror Transport Study with AIC Fluctuations" to be published in Journal of Plasma and Fusion Research. (1999)

1998 Fiscal Year Annual Research Report

自発励起アルベン波動による高エネルギーイオンの散乱

Principal Investigator

市村 真 筑波大学, 物理工学系, 助教授 (10151482)

Research Products

[Publications] A.Mase,T.Tokuzawa,et al.: "Density Profile and Fluctuation Measurements Using Microwave Reflectometry" Journal of Plasma and Fusion Research. 74・10. 1189-1200 (1998)

[Publications] Y. Kiwamoto,Y.Kikuchi,et al.: "Pinhole Camera Imaging of X Rays and Energetic Neutral Atoms for Hot Plasma Diagnostics" Rev.Sci.Instrum.69・6. 2574-2575 (1998)

[Publications] S.Tanaka,M.Ichimura,et al.: "Macroscopic Stability Control Experiments with Phased Antennas in the GAMMA 10 Tandem Mirror" Journal of the Physical Society of Japan. 67・6. 1963-1967 (1998)

[Publications] K.Yatsu,L.G.Bruskin,et al.: "Experimental Study of Potential Confinement of ICRF-Heated Plasma in GAMMA 10" Journal of Plasma and Fusion Research. 74・8. 844-849 (1998)

[Publications] K.Yatsu,L.G.Bruskin,et al.: "Plasma Confinement in the GAMMA 10 Tandem Mirror" 17th IAEA Fusion Energy Conference,Yokohama. IAEA-CN-69. EX4/6 (1998)

[Publications] M.Ichimura,H.Hojo,et al.: "Characteristics of Hot Ions with a Strong RF Heating in the GAMMA 10 Tandem Mirror" 17th IAEA Fusion Energy Conference,Yokohama. IAEA-CN-69. EX4/8 (1998)

[Publications] M.Ichimura,S.Kanazawa,et al.: "ICEF Antenna Arrangement for Axisymmetric Plasma Formation in the GAMMA 10 Tandem Mirror" 1998 ICPP & 25th EPS Conf.on Contr.Fusion and Plasma Physics,Praba,. 22C. 1292-1295 (1998)

[Publications] K.Kajiwara,T.Saito,et al.: "Validity of a Model Electron Distribution Function in an End Region of a Tandem Mirror" Journal of The Physical Society of Japan. 67・10. 3647-3648 (1998)

[Publications] I.Katanuma,Y.Kiwamoto,et al.: "On the plug potential profile in a tandem mirror" Physics of Plasmas. 5・5. 1560-1562 (1998)

[Publications] Y.Nakashima,Y.Hasegawa,et al.: "Charge-exchange neutral particle measurements on electron cyclotron resonance heating experiments in hot-ion-mode plasmas of the GAMMA 10 tandem mirror" Review of Scientific Instruments. 70・1. 849-852 (1999)

[Publications] Y.Kogi,A.Mase,et al.: "Cross-polarization scattering from low-frequency electromagnetic waves in the GAMMA 10 tandem mirror" Review of Scientific Instruments. 70・1. 991-994 (1999)

[Publications] M.Ichimura,C.Satake,et al.: "Behaviour of High Energy Ions in the GAMMA 10 Tandem Mirror," Review of Scientific Instruments. 70・1. 834-837 (1999)

[Publications] S.Tanaka,M.Ichimura,et al.: "Low Frequency Fluctuations Measured by Probes in the GAMMA 10 Tandem Mirror" Review of Scientific Instruments. 70・1. 979-982 (1999)

[Publications] T.Goro,K.Ishii,et al.: "New typeof compact electrostatic energy analyzer adequate to measurement of charge exchange neutral particles with a low counting yield" Review of Scientific Instruments. 70・1. 845-848 (1999)

[Publications] K.Ishii,T.Goto,et al.: "Ion Transport in Velocity Space due to Alfven-Ion-Cyclotron Fluctuations Excited in the RF Driven Tandem Mirror Plasma" transactions of fusion technology. 35・1T. 175-179 (1999)

[Publications] K.Yatsu,L.G.Bruskin,et al.: "Recent Results of Experiments on Tandem Mirror GAMMA 10" transactions of fusion technology. 35・1T. 52-59 (1999)

[Publications] A.Mase,T.Tokuzawa,et al.: "Density Profile and Fluctuation Measurements with Microwave Reflectometry on GAMMA 10" transactions of fusion technology. 35・1T. 210-214 (1999)

[Publications] T.Saito,Y.Tatematsu,et al.: "Measurement and Control of End Loss Electrons from the GAMMA 10 Tandem Mirror" transactions of fusion technology. 35・1T. 233-237 (1999)

[Publications] H.Hojo,M.Nakamura,et al.: "Effects of Alfven Ion Cyclotron Modes on Tandem Mirror Energy Transport" to be published in Journal of Plasma and Fusion Research. 75・3. (1999)

[Publications] M.Nakamura,M.Ichimura,et al.: "Alfven wave excitation due to pressure anisotropy in the GAMMA 10 tandem mirror" to be published in Journal of Plasmaand Fusion Research. (1999)

[Publications] Y.Nakashima,K.Yatsu,et al.: "Plasma Confinement and Behavior of Plasma in the Minimum-B Region of the GAMMA 10 Tandem Mirror" to be published in Journal of Plasmaand Fusion Research. 75・3. (1999)

[Publications] T.Saito,M.Ichimura,et al.: "Enhanced axial loss of electrons from a tandem mirror induced by an Alfven ion cyclotron wave" Physical Review Letters. 82・6. 1169-1172 (1999)

[Publications] K.Yatsu,T.Cho,et al.: "Reduction of Radial Loss by Conducting Plates Installed in Anchor Region of GAMMA 10" to be published in Chinese Physics Letters. (1999)

[Publications] H.Hojo,M.Nakamura,et al.: "Tandem Mirror Transport Study with AIC Fluctuations" to be published in Journal of Plasma and Fusion Research. (1999)

市村真筑波大学, 物理工学系, 助教授 (10151482)