ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses

G. Szepesi; C. M. Roach; F. J. Casson; C. D. Challis; J. Garcia; L. Garzotti; K. Hyun-Tae; L. Irvine; E. Lerche; F. Rimini; J. Candy; G. Staebler

ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses

G. Szepesi, C. M. Roach, F. J. Casson, C. D. Challis, J. Garcia, L. Garzotti, K. Hyun-Tae, L. Irvine, E. Lerche, F. Rimini, J. Candy, G. Staebler

Fusion Theory and Modeling

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

A comparative transport analysis has been presented between two high current ILW JET pulses: the recent high performance pulse 92436 achieving record neutron rate and the previous record pulse 87412. JETTO-TGLF simulations predicting n_e, T_e, and T_i are able to capture the major difference in performance between the two pulses. For 92436 a very good agreement between input experimental data and predicted profiles has been achieved, while for 87412 using the same modelling assumptions the discrepancy is higher. In our attempt to find the critical parameters that separate the high and lower performance simulations, it was discovered that the predictive JETTO-TGLF simulations depend on the initial conditions. This is completely reasonable in pulses where the turbulent transport is dominated by ITG modes considering the stabilizing effect of T_i/T_e on ITG growth rates and ion heat flux. However, it implies that extrapolating simulations to different scenarios, such as those planned for the D-T campaign, may not be reliable without predicting the evolution of the plasma from the beginning of the discharge.

Original language	English
Title of host publication	44th EPS Conference on Plasma Physics, EPS 2017
Editors	A. Bret, M. Fajardo, E. Westerhof, A. Melzer, B. Dromey, C. Riconda
Publisher	European Physical Society (EPS)
ISBN (Print)	9781510849303
State	Published - 2017
Event	44th European Physical Society Conference on Plasma Physics, EPS 2017 - Belfast, United Kingdom Duration: Jun 26 2017 → Jun 30 2017

Publication series

Name	44th EPS Conference on Plasma Physics, EPS 2017

Conference

Conference	44th European Physical Society Conference on Plasma Physics, EPS 2017
Country/Territory	United Kingdom
City	Belfast
Period	06/26/17 → 06/30/17

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Cite this

Szepesi, G., Roach, C. M., Casson, F. J., Challis, C. D., Garcia, J., Garzotti, L., Hyun-Tae, K., Irvine, L., Lerche, E., Rimini, F., Candy, J., & Staebler, G. (2017). ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses. In A. Bret, M. Fajardo, E. Westerhof, A. Melzer, B. Dromey, & C. Riconda (Eds.), 44th EPS Conference on Plasma Physics, EPS 2017 Article O4.121 (44th EPS Conference on Plasma Physics, EPS 2017). European Physical Society (EPS).

@inproceedings{364c3f307fa44b76a4e18fee5b8615b2,

title = "ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses",

abstract = "A comparative transport analysis has been presented between two high current ILW JET pulses: the recent high performance pulse 92436 achieving record neutron rate and the previous record pulse 87412. JETTO-TGLF simulations predicting ne, Te, and Ti are able to capture the major difference in performance between the two pulses. For 92436 a very good agreement between input experimental data and predicted profiles has been achieved, while for 87412 using the same modelling assumptions the discrepancy is higher. In our attempt to find the critical parameters that separate the high and lower performance simulations, it was discovered that the predictive JETTO-TGLF simulations depend on the initial conditions. This is completely reasonable in pulses where the turbulent transport is dominated by ITG modes considering the stabilizing effect of Ti/Te on ITG growth rates and ion heat flux. However, it implies that extrapolating simulations to different scenarios, such as those planned for the D-T campaign, may not be reliable without predicting the evolution of the plasma from the beginning of the discharge.",

author = "G. Szepesi and Roach, \{C. M.\} and Casson, \{F. J.\} and Challis, \{C. D.\} and J. Garcia and L. Garzotti and K. Hyun-Tae and L. Irvine and E. Lerche and F. Rimini and J. Candy and G. Staebler",

note = "Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.; 44th European Physical Society Conference on Plasma Physics, EPS 2017 ; Conference date: 26-06-2017 Through 30-06-2017",

year = "2017",

language = "English",

isbn = "9781510849303",

series = "44th EPS Conference on Plasma Physics, EPS 2017",

publisher = "European Physical Society (EPS)",

editor = "A. Bret and M. Fajardo and E. Westerhof and A. Melzer and B. Dromey and C. Riconda",

booktitle = "44th EPS Conference on Plasma Physics, EPS 2017",

}

Szepesi, G, Roach, CM, Casson, FJ, Challis, CD, Garcia, J, Garzotti, L, Hyun-Tae, K, Irvine, L, Lerche, E, Rimini, F, Candy, J & Staebler, G 2017, ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses. in A Bret, M Fajardo, E Westerhof, A Melzer, B Dromey & C Riconda (eds), 44th EPS Conference on Plasma Physics, EPS 2017., O4.121, 44th EPS Conference on Plasma Physics, EPS 2017, European Physical Society (EPS), 44th European Physical Society Conference on Plasma Physics, EPS 2017, Belfast, United Kingdom, 06/26/17.

ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses. / Szepesi, G.; Roach, C. M.; Casson, F. J. et al.
44th EPS Conference on Plasma Physics, EPS 2017. ed. / A. Bret; M. Fajardo; E. Westerhof; A. Melzer; B. Dromey; C. Riconda. European Physical Society (EPS), 2017. O4.121 (44th EPS Conference on Plasma Physics, EPS 2017).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses

AU - Szepesi, G.

AU - Roach, C. M.

AU - Casson, F. J.

AU - Challis, C. D.

AU - Garcia, J.

AU - Garzotti, L.

AU - Hyun-Tae, K.

AU - Irvine, L.

AU - Lerche, E.

AU - Rimini, F.

AU - Candy, J.

AU - Staebler, G.

PY - 2017

Y1 - 2017

N2 - A comparative transport analysis has been presented between two high current ILW JET pulses: the recent high performance pulse 92436 achieving record neutron rate and the previous record pulse 87412. JETTO-TGLF simulations predicting ne, Te, and Ti are able to capture the major difference in performance between the two pulses. For 92436 a very good agreement between input experimental data and predicted profiles has been achieved, while for 87412 using the same modelling assumptions the discrepancy is higher. In our attempt to find the critical parameters that separate the high and lower performance simulations, it was discovered that the predictive JETTO-TGLF simulations depend on the initial conditions. This is completely reasonable in pulses where the turbulent transport is dominated by ITG modes considering the stabilizing effect of Ti/Te on ITG growth rates and ion heat flux. However, it implies that extrapolating simulations to different scenarios, such as those planned for the D-T campaign, may not be reliable without predicting the evolution of the plasma from the beginning of the discharge.

AB - A comparative transport analysis has been presented between two high current ILW JET pulses: the recent high performance pulse 92436 achieving record neutron rate and the previous record pulse 87412. JETTO-TGLF simulations predicting ne, Te, and Ti are able to capture the major difference in performance between the two pulses. For 92436 a very good agreement between input experimental data and predicted profiles has been achieved, while for 87412 using the same modelling assumptions the discrepancy is higher. In our attempt to find the critical parameters that separate the high and lower performance simulations, it was discovered that the predictive JETTO-TGLF simulations depend on the initial conditions. This is completely reasonable in pulses where the turbulent transport is dominated by ITG modes considering the stabilizing effect of Ti/Te on ITG growth rates and ion heat flux. However, it implies that extrapolating simulations to different scenarios, such as those planned for the D-T campaign, may not be reliable without predicting the evolution of the plasma from the beginning of the discharge.

UR - https://www.scopus.com/pages/publications/85055040067

M3 - Conference contribution

AN - SCOPUS:85055040067

SN - 9781510849303

T3 - 44th EPS Conference on Plasma Physics, EPS 2017

BT - 44th EPS Conference on Plasma Physics, EPS 2017

A2 - Bret, A.

A2 - Fajardo, M.

A2 - Westerhof, E.

A2 - Melzer, A.

A2 - Dromey, B.

A2 - Riconda, C.

PB - European Physical Society (EPS)

T2 - 44th European Physical Society Conference on Plasma Physics, EPS 2017

Y2 - 26 June 2017 through 30 June 2017

ER -

Szepesi G, Roach CM, Casson FJ, Challis CD, Garcia J, Garzotti L et al. ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses. In Bret A, Fajardo M, Westerhof E, Melzer A, Dromey B, Riconda C, editors, 44th EPS Conference on Plasma Physics, EPS 2017. European Physical Society (EPS). 2017. O4.121. (44th EPS Conference on Plasma Physics, EPS 2017).

ITG heat flux reduction in JETTO-TGLF modelling of high current high performance JET pulses

Abstract

Publication series

Conference

Funding

Other files and links

Fingerprint

Cite this