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Performance Assessment of Helicon Wave Heating and Current Drive in EXL-50 Spherical Torus Plasmas.

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Title: Performance Assessment of Helicon Wave Heating and Current Drive in EXL-50 Spherical Torus Plasmas.
Authors: Qiao, G. J.1 (AUTHOR), Luo, D.2,3 (AUTHOR), Song, S. D.2,3 (AUTHOR), Dong, J. Q.2,3 (AUTHOR), Shi, Y. J.2,3 (AUTHOR), Li, Jingchun4 (AUTHOR) jingchunli@pku.edu.cn, Du, D.1 (AUTHOR), Peng, Y. K. Martin2,3 (AUTHOR), Liu, M. S.2,3 (AUTHOR)
Source: Journal of Fusion Energy. Dec2023, Vol. 42 Issue 2, p1-9. 9p.
Abstract: Analysis of helicon wave heating and current drive capability in EXL-50 spherical torus plasmas has been conducted. It is found that the driven current increases with the launched parallel refractive index n | | and peaks around n | | = 4.0 when the frequency of the helicon wave is between 300 and 380 MHz. The helicon wave current drive efficiency shows a relatively stable upward trend with increasing plasma temperature. Moreover, the driven current decreases as the plasma density increases. We also analyzed the current drive with helicon waves of 150 MHz and 170 MHz and found that the driven current at a lower frequency was lower than that at a higher frequency. A positive proportional relationship exists between the driven current and n | | . Besides, as n | | increases, the profile of the driven current becomes wider. Finally, the effect of the scrape-off layer (SOL) region on the helicon wave current drive was also investigated. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fusion Energy is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Performance Assessment of Helicon Wave Heating and Current Drive in EXL-50 Spherical Torus Plasmas.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fusion+Energy%22">Journal of Fusion Energy</searchLink>. Dec2023, Vol. 42 Issue 2, p1-9. 9p.
– Name: Abstract
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  Data: Analysis of helicon wave heating and current drive capability in EXL-50 spherical torus plasmas has been conducted. It is found that the driven current increases with the launched parallel refractive index n | | and peaks around n | | = 4.0 when the frequency of the helicon wave is between 300 and 380 MHz. The helicon wave current drive efficiency shows a relatively stable upward trend with increasing plasma temperature. Moreover, the driven current decreases as the plasma density increases. We also analyzed the current drive with helicon waves of 150 MHz and 170 MHz and found that the driven current at a lower frequency was lower than that at a higher frequency. A positive proportional relationship exists between the driven current and n | | . Besides, as n | | increases, the profile of the driven current becomes wider. Finally, the effect of the scrape-off layer (SOL) region on the helicon wave current drive was also investigated. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Fusion Energy is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Dec2023
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