Influence of Li conditioning on Lower Hybrid Current Drive efficiency in H-mode and L-mode plasmas on EAST

Marc Goniche; Miaohui Li; Yves Peysson; Yingjie Chen; Bojiang Ding; Annika Ekedahl; Haiqing Liu; Yong Liu; Jinping Qian; Xiuda Yang; Qing Zang; Tao Zhang; Sun Zhen; Xiao Lan Zou

doi:10.1051/epjconf/201715703018

Influence of Li conditioning on Lower Hybrid Current Drive efficiency in H-mode and L-mode plasmas on EAST

Marc Goniche, Miaohui Li, Yves Peysson, Yingjie Chen, Bojiang Ding, Annika Ekedahl, Haiqing Liu, Yong Liu, Jinping Qian, Xiuda Yang, Qing Zang, Tao Zhang, Sun Zhen, Xiao Lan Zou

Research output: Contribution to journal › Conference article › peer-review

7 Scopus citations

Abstract

The lower hybrid current drive efficiency on the EAST tokamak is estimated on a large database of low loop voltage discharges (V_L<120mV) covering the 2016 campaign starting with lithium-free plasma facing components and ending with strong cumulated deposition of lithium. The efficiency is found to vary in a wide range from 0.6 to 1.2×10¹⁹A.W^-1.m^-2. No deleterious effect of the density on the efficiency is found between 2.3 and 3.2×10¹⁹m^-3. The high efficiency occurs after strong lithium evaporation. The low effective charge Z_eff and the higher temperature <T_e> of these discharges, can account for the high efficiency according to the expected scaling with Z_eff and <T_e>. Modelling with a ray-tracing code coupled to a Fokker-Planck solver supports this result, assuming that the fast electron transport is reduced in the zero loop voltage discharge with high efficiency.

Original language	English (US)
Article number	03018
Journal	EPJ Web of Conferences
Volume	157
DOIs	https://doi.org/10.1051/epjconf/201715703018
State	Published - Oct 23 2017
Externally published	Yes
Event	22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 - Aix en Provence, France Duration: May 30 2017 → Jun 2 2017

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

10.1051/epjconf/201715703018

Cite this

@article{77bd466b9de4424f9d994d783930cf01,

title = "Influence of Li conditioning on Lower Hybrid Current Drive efficiency in H-mode and L-mode plasmas on EAST",

abstract = "The lower hybrid current drive efficiency on the EAST tokamak is estimated on a large database of low loop voltage discharges (VL<120mV) covering the 2016 campaign starting with lithium-free plasma facing components and ending with strong cumulated deposition of lithium. The efficiency is found to vary in a wide range from 0.6 to 1.2×1019A.W-1.m-2. No deleterious effect of the density on the efficiency is found between 2.3 and 3.2×1019m-3. The high efficiency occurs after strong lithium evaporation. The low effective charge Zeff and the higher temperature e> of these discharges, can account for the high efficiency according to the expected scaling with Zeff and e>. Modelling with a ray-tracing code coupled to a Fokker-Planck solver supports this result, assuming that the fast electron transport is reduced in the zero loop voltage discharge with high efficiency.",

author = "Marc Goniche and Miaohui Li and Yves Peysson and Yingjie Chen and Bojiang Ding and Annika Ekedahl and Haiqing Liu and Yong Liu and Jinping Qian and Xiuda Yang and Qing Zang and Tao Zhang and Sun Zhen and Zou, \{Xiao Lan\}",

note = "Publisher Copyright: {\textcopyright} 2017 The authors, published by EDP Sciences.; 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 ; Conference date: 30-05-2017 Through 02-06-2017",

year = "2017",

month = oct,

day = "23",

doi = "10.1051/epjconf/201715703018",

language = "English (US)",

volume = "157",

journal = "EPJ Web of Conferences",

issn = "2101-6275",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Influence of Li conditioning on Lower Hybrid Current Drive efficiency in H-mode and L-mode plasmas on EAST

AU - Goniche, Marc

AU - Li, Miaohui

AU - Peysson, Yves

AU - Chen, Yingjie

AU - Ding, Bojiang

AU - Ekedahl, Annika

AU - Liu, Haiqing

AU - Liu, Yong

AU - Qian, Jinping

AU - Yang, Xiuda

AU - Zang, Qing

AU - Zhang, Tao

AU - Zhen, Sun

AU - Zou, Xiao Lan

PY - 2017/10/23

Y1 - 2017/10/23

N2 - The lower hybrid current drive efficiency on the EAST tokamak is estimated on a large database of low loop voltage discharges (VL<120mV) covering the 2016 campaign starting with lithium-free plasma facing components and ending with strong cumulated deposition of lithium. The efficiency is found to vary in a wide range from 0.6 to 1.2×1019A.W-1.m-2. No deleterious effect of the density on the efficiency is found between 2.3 and 3.2×1019m-3. The high efficiency occurs after strong lithium evaporation. The low effective charge Zeff and the higher temperature e> of these discharges, can account for the high efficiency according to the expected scaling with Zeff and e>. Modelling with a ray-tracing code coupled to a Fokker-Planck solver supports this result, assuming that the fast electron transport is reduced in the zero loop voltage discharge with high efficiency.

AB - The lower hybrid current drive efficiency on the EAST tokamak is estimated on a large database of low loop voltage discharges (VL<120mV) covering the 2016 campaign starting with lithium-free plasma facing components and ending with strong cumulated deposition of lithium. The efficiency is found to vary in a wide range from 0.6 to 1.2×1019A.W-1.m-2. No deleterious effect of the density on the efficiency is found between 2.3 and 3.2×1019m-3. The high efficiency occurs after strong lithium evaporation. The low effective charge Zeff and the higher temperature e> of these discharges, can account for the high efficiency according to the expected scaling with Zeff and e>. Modelling with a ray-tracing code coupled to a Fokker-Planck solver supports this result, assuming that the fast electron transport is reduced in the zero loop voltage discharge with high efficiency.

UR - https://www.scopus.com/pages/publications/85032645059

UR - https://www.scopus.com/inward/citedby.url?scp=85032645059&partnerID=8YFLogxK

U2 - 10.1051/epjconf/201715703018

DO - 10.1051/epjconf/201715703018

M3 - Conference article

AN - SCOPUS:85032645059

SN - 2101-6275

VL - 157

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

M1 - 03018

T2 - 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017

Y2 - 30 May 2017 through 2 June 2017

ER -

Influence of Li conditioning on Lower Hybrid Current Drive efficiency in H-mode and L-mode plasmas on EAST

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this