| Project/Area Number |
15340199
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Plasma science
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| Research Institution | Tokai University |
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Principal Investigator |
TANIKAWA Takao Tokai University, Research Institute of Science and Technology, Professor, 総合科学技術研究所, 教授 (70207174)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Shunjiro Kyusyu University, Interdisciplinary Graduate School of Engineering Sciences, Associate Professor, 大学院・総合理工学研究院, 助教授 (10134446)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2004: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 2003: ¥7,300,000 (Direct Cost: ¥7,300,000)
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| Keywords | Lower-Hybrid Waves / Solitons / Cavitons / Helicon-Plasma Source / Nonlinear Plasma Waves / Plasma Wave Phenomena / Space Plasmas / Ion Acceleration |
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| Research Abstract |
1. A large volume helicon-plasma device (74 cm in diameter, 486 cm in length, and B_<max> = 2 kG) has been developed at ISAS/JAXA (the Institute of Space and Astronautical Science, a division of the Japan Aerospace Exploration Agency). With the use of a large flat-spiral antenna (43 cm in diameter, 4 turns), the device is capable of producing a world-largest-volume helicon-plasma of n_e 【greater than or equal】 10^<12> cm^<-3> with moderate rf input power of 〜500 W for Ar (【less than or equal】2 kW for He).
2. With this device, it is possible to control the radial density profile by (1) changing the magnetic-field configuration near the antenna and (2) changing the antenna radiation-field patterns.
3. Another helicon-plasma device (20 cm in diameter, 100 cm in length, and B_<max> = 0.6 kG), which is specialized to excite large amplitude lower-hybrid waves, has been developed at Tokai University. The device utilizes a specially designed segmented multi-loop antenna for both plasma production and wave excitation.
4. At ISAS/JAXA, it was attempted to excite lower-hybrid (LH) cavity modes inside a pre-produced low density channel along the axis by using an axially long grid-antenna. The excitation of cavity eigen-modes has not been confirmed yet.
5. At Tokai, a series of experiments has been initiated in order to excite LH solitons using an outer part of the multi-loop antenna as an exciter.
6. In the future experiment, it will be attempted to observe cross-field acceleration of plasma ions due to localized fields associated with LH solitons.
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