High fusion performance at high Ti/Te in JET-ILW baseline plasmas with high NBI heating power and low gas puffing

JET contributors

doi:10.1088/1741-4326/aaa582

High fusion performance at high T_i/T_e in JET-ILW baseline plasmas with high NBI heating power and low gas puffing

JET contributors

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

This paper presents the transport analysis of high density baseline discharges in the 2016 experimental campaign of the Joint European Torus with the ITER-Like Wall (JET-ILW), where a significant increase in the deuterium-deuterium (D-D) fusion neutron rate (∼2.8 10¹⁶ s^-1) was achieved with stable high neutral beam injection (NBI) powers of up to 28 MW and low gas puffing. Increase in T _i exceeding T _e were produced for the first time in baseline discharges despite the high electron density; this enabled a significant increase in the thermal fusion reaction rate. As a result, the new achieved record in fusion performance was much higher than the previous record in the same heating power baseline discharges, where T _i = T _e. In addition to the decreases in collisionality and the increases in ion heating fraction in the discharges with high NBI power, T _i > T _e can also be attributed to positive feedback between the high T _i/T _e ratio and stabilisation of the turbulent heat flux resulting from the ion temperature gradient driven mode. The high T _i/T _e ratio was correlated with high rotation frequency. Among the discharges with identical beam heating power, higher rotation frequencies were observed when particle fuelling was provided by low gas puffing and pellet injection. This reveals that particle fuelling played a key role for achieving high T _i/T _e, and the improved fusion performance.

Original language	English
Article number	036020
Journal	Nuclear Fusion
Volume	58
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/aaa582
State	Published - 1 Feb 2018
Externally published	Yes

Keywords

JET-ILW
T/T
TRANSP
baseline scenario
fusion performance
gas puffing

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10.1088/1741-4326/aaa582

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@article{df861fd59a22458baa3662b4ca7d8bd1,

title = "High fusion performance at high Ti/Te in JET-ILW baseline plasmas with high NBI heating power and low gas puffing",

abstract = "This paper presents the transport analysis of high density baseline discharges in the 2016 experimental campaign of the Joint European Torus with the ITER-Like Wall (JET-ILW), where a significant increase in the deuterium-deuterium (D-D) fusion neutron rate (∼2.8 1016 s-1) was achieved with stable high neutral beam injection (NBI) powers of up to 28 MW and low gas puffing. Increase in T i exceeding T e were produced for the first time in baseline discharges despite the high electron density; this enabled a significant increase in the thermal fusion reaction rate. As a result, the new achieved record in fusion performance was much higher than the previous record in the same heating power baseline discharges, where T i = T e. In addition to the decreases in collisionality and the increases in ion heating fraction in the discharges with high NBI power, T i > T e can also be attributed to positive feedback between the high T i/T e ratio and stabilisation of the turbulent heat flux resulting from the ion temperature gradient driven mode. The high T i/T e ratio was correlated with high rotation frequency. Among the discharges with identical beam heating power, higher rotation frequencies were observed when particle fuelling was provided by low gas puffing and pellet injection. This reveals that particle fuelling played a key role for achieving high T i/T e, and the improved fusion performance.",

keywords = "JET-ILW, T/T, TRANSP, baseline scenario, fusion performance, gas puffing",

author = "{JET contributors} and Kim, {Hyun Tae} and Sips, {A. C.C.} and M. Romanelli and Challis, {C. D.} and F. Rimini and L. Garzotti and E. Lerche and J. Buchanan and X. Yuan and S. Kaye and X. Litaudon and S. Abduallev and M. Abhangi and P. Abreu and M. Afzal and Aggarwal, {K. M.} and T. Ahlgren and Ahn, {J. H.} and L. Aho-Mantila and N. Aiba and M. Airila and R. Albanese and V. Aldred and D. Alegre and E. Alessi and P. Aleynikov and A. Alfier and A. Alkseev and M. Allinson and B. Alper and E. Alves and G. Ambrosino and R. Ambrosino and L. Amicucci and V. Amosov and Sund{\'e}n, {E. Andersson} and M. Angelone and M. Anghel and C. Angioni and L. Appel and C. Appelbee and P. Arena and M. Ariola and H. Arnichand and S. Arshad and A. Ash and N. Ashikawa and V. Aslanyan and O. Asunta and Wiechec, {A. Baron}",

note = "Publisher Copyright: {\textcopyright} EURATOM 2018.",

year = "2018",

month = feb,

day = "1",

doi = "10.1088/1741-4326/aaa582",

language = "英语",

volume = "58",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

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TY - JOUR

T1 - High fusion performance at high Ti/Te in JET-ILW baseline plasmas with high NBI heating power and low gas puffing

AU - JET contributors

AU - Kim, Hyun Tae

AU - Sips, A. C.C.

AU - Romanelli, M.

AU - Challis, C. D.

AU - Rimini, F.

AU - Garzotti, L.

AU - Lerche, E.

AU - Buchanan, J.

AU - Yuan, X.

AU - Kaye, S.

AU - Litaudon, X.

AU - Abduallev, S.

AU - Abhangi, M.

AU - Abreu, P.

AU - Afzal, M.

AU - Aggarwal, K. M.

AU - Ahlgren, T.

AU - Ahn, J. H.

AU - Aho-Mantila, L.

AU - Aiba, N.

AU - Airila, M.

AU - Albanese, R.

AU - Aldred, V.

AU - Alegre, D.

AU - Alessi, E.

AU - Aleynikov, P.

AU - Alfier, A.

AU - Alkseev, A.

AU - Allinson, M.

AU - Alper, B.

AU - Alves, E.

AU - Ambrosino, G.

AU - Ambrosino, R.

AU - Amicucci, L.

AU - Amosov, V.

AU - Sundén, E. Andersson

AU - Angelone, M.

AU - Anghel, M.

AU - Angioni, C.

AU - Appel, L.

AU - Appelbee, C.

AU - Arena, P.

AU - Ariola, M.

AU - Arnichand, H.

AU - Arshad, S.

AU - Ash, A.

AU - Ashikawa, N.

AU - Aslanyan, V.

AU - Asunta, O.

AU - Wiechec, A. Baron

PY - 2018/2/1

Y1 - 2018/2/1

N2 - This paper presents the transport analysis of high density baseline discharges in the 2016 experimental campaign of the Joint European Torus with the ITER-Like Wall (JET-ILW), where a significant increase in the deuterium-deuterium (D-D) fusion neutron rate (∼2.8 1016 s-1) was achieved with stable high neutral beam injection (NBI) powers of up to 28 MW and low gas puffing. Increase in T i exceeding T e were produced for the first time in baseline discharges despite the high electron density; this enabled a significant increase in the thermal fusion reaction rate. As a result, the new achieved record in fusion performance was much higher than the previous record in the same heating power baseline discharges, where T i = T e. In addition to the decreases in collisionality and the increases in ion heating fraction in the discharges with high NBI power, T i > T e can also be attributed to positive feedback between the high T i/T e ratio and stabilisation of the turbulent heat flux resulting from the ion temperature gradient driven mode. The high T i/T e ratio was correlated with high rotation frequency. Among the discharges with identical beam heating power, higher rotation frequencies were observed when particle fuelling was provided by low gas puffing and pellet injection. This reveals that particle fuelling played a key role for achieving high T i/T e, and the improved fusion performance.

AB - This paper presents the transport analysis of high density baseline discharges in the 2016 experimental campaign of the Joint European Torus with the ITER-Like Wall (JET-ILW), where a significant increase in the deuterium-deuterium (D-D) fusion neutron rate (∼2.8 1016 s-1) was achieved with stable high neutral beam injection (NBI) powers of up to 28 MW and low gas puffing. Increase in T i exceeding T e were produced for the first time in baseline discharges despite the high electron density; this enabled a significant increase in the thermal fusion reaction rate. As a result, the new achieved record in fusion performance was much higher than the previous record in the same heating power baseline discharges, where T i = T e. In addition to the decreases in collisionality and the increases in ion heating fraction in the discharges with high NBI power, T i > T e can also be attributed to positive feedback between the high T i/T e ratio and stabilisation of the turbulent heat flux resulting from the ion temperature gradient driven mode. The high T i/T e ratio was correlated with high rotation frequency. Among the discharges with identical beam heating power, higher rotation frequencies were observed when particle fuelling was provided by low gas puffing and pellet injection. This reveals that particle fuelling played a key role for achieving high T i/T e, and the improved fusion performance.

KW - JET-ILW

KW - T/T

KW - TRANSP

KW - baseline scenario

KW - fusion performance

KW - gas puffing

UR - http://www.scopus.com/inward/record.url?scp=85042160482&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/aaa582

DO - 10.1088/1741-4326/aaa582

M3 - 文章

AN - SCOPUS:85042160482

SN - 0029-5515

VL - 58

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

M1 - 036020

ER -

High fusion performance at high T_i/T_e in JET-ILW baseline plasmas with high NBI heating power and low gas puffing

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Keywords

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