Measurements of the fast ion slowing-down times in the HL-2A tokamak and comparison to classical theory
| Autor: | G.J. Lei, M. Isobe, H. L. Wei, Hl A Team, Guoliang Yuan, X.M. Song, Jinwei Yang, Xu Li, Xuru Duan, Qingwei Yang, Yi Liu, Zhongbing Shi, X. Y. Song, Y.G. Li, J.Y. Cao, Y.P. Zhang, Longwen Yan |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 19:112504 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.4768425 |
| Popis: | Physics related to fast ions in magnetically confined fusion plasmas is a very important issue, since these particles will play an important role in future burning plasmas. Indeed, they will act as primary heating source and will sustain the self-ignited condition. To measure the fast ion slowing-down times in a magnetohydrodynamic-quiescent plasmas in different scenarios, very short pulses of a deuterium neutral beam, so-called “blip,” with duration of about 5 ms were tangentially co-injected into a deuterium plasmas at the HuanLiuqi-2A (commonly referred to as HL-2A) tokamak [L. W. Yan, Nucl. Fusion 51, 094016 (2011)]. The decay rate of 2.45 MeV D-D fusion neutrons produced by beam-plasma reactions following neutral beam termination was measured by means of a 235U fission chamber. Experimental results were compared with those predicted by a classical slowing-down model. These results show that the fast ions are well confined with a peaked profile and the ions are slowed down classically without significant loss in the HL-2A tokamak. Moreover, it has been observed that during electron cyclotron resonance heating the fast ions have a longer slowing-down time and the neutron emission rate decay time becomes longer. |
| Databáze: | OpenAIRE |
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