| Project/Area Number |
07458089
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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 |
プラズマ理工学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
HATAKEYAMA Rikizo Tohoku Univ.Fac.Engrg., Prof., Asso.Prof., 工学部, 助教授 (00108474)
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Takamichi Tohoku Univ.Fac.Engrg., Research Asso., 工学部, 助手 (80260420)
ISHIGURO Seiji Tohoku Univ.Fac.Engrg., Research Asso., 工学部, 助手 (10193301)
IIZUKA Satoru Tohoku Univ.Fac.Engrg., Asso.Prof., 工学部, 助教授 (20151227)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥6,800,000 (Direct Cost: ¥6,800,000)
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| Keywords | Local ECR / Plasma Potential Formation / Barrier Potential / フラズマ電位形成 |
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| Research Abstract |
Plasma potential formation is investigated in a fully-ionized collisionless plasma flow in the presence of an electron cyclotron resonance (ECR) point under simple mirror configurations of magnetic field. The magnetic-well, converging-field and diverging-field configurations are generated in the single-ended Q machine.
When ECR takes place at the magnetic-well bottom, a potential strucature is observed to consist of a negative potential depression around the ECR point and a subsequent positive potential peak. This potential structure gradually collapses in the time scale determined by the ion-flow speed, during which low-frequency drift and flute instabilities are observed to grow intensively. In the case of a converging magnetic field such a potential structure is observed to persist in the steady state when the ECR point is located in the region of good magnetic-field curvature. But, this structure is formed only transiently when the ECR point is located in the region of bad magnetic-field curvature. Thus, the formation of an ion plug and electron thermal-barrier potential is demonstrated in the presence of the ECR point under simple configurations of magnetic mirror field, being different from the original scenario for the tandem-mirror plasma confinement. When ECR takes place in a diverging magnetic field, on the other hand, there appears a strong potential drop along the field lines, which results from a field-aligned electron acceleration, being accompanied by an effective ion acceleration.
The potential formations described above are explained by the selective electron-deceleration/acceleration parallel to the field lines due to ECR and electrostatic ion-deceleration/acceleration self-consistently organized due to the condition of quasineutrality.
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