2011 Fiscal Year Final Research Report
Charge separation current in a electron cyclotron heated torus plasma
| Project/Area Number |
22740363
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Plasma science
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| Research Institution | Kyoto University |
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Principal Investigator |
UCHIDA Masaki 京都大学, 大学院・エネルギー科学研究科, 助教 (90322164)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 単純トーラスプラズマ / 平衡 / 電子サイクロトロン加熱 |
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| Research Abstract |
In plasmas immersed in the toroidal field B, electrons drift downward while ions drift upward due to the field gradient and curvature(B.> 0 assumed). The same amount of current must flow into and out from the conducting vessel walls at the top and bottom, respectively, to realize current circulation via the vacuum vessel. In an ECR plasma in the LATE device radial profiles of vertical charge separation currents have been measured by radially aligned multi-electrodes fabricated at the top and bottom. Both the profiles at the top and bottom are nearly the same as the profile 2pe/RB. in the plasma as theoretically predicted. Current characteristics upon the sweep of external voltage onto the top ion collectors reveal that the current is due to inflow of ions with no secondary electron emission.
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