Modeling of solenoid-free start-up using 2nd harmonic electron cyclotron heating and current drive in QUEST

M. Ono, N. Bertelli, H. Idei, K. Hanada, T. Onchi, S. Kojima, H. Elserafy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A grid-based ECH ST/Tokamak start-up model is being developed where plasma parameters, generated plasma currents, and resulting poloidal magnetic fields are evolved from the vacuum fields. Initially, the current generated is purely pressure driven since the electron temperature is too low for ECCD. The grad-B drift driven current together with the processional currents can then create a closed flux surface configuration and then the bootstrap current in a closed configuration can further enhance the plasma current. After the flux closure, the 2nd harmonic ECH heating efficiency increases with plasma current since the confinement is increased and resulting electron temperature rise would further increase the ECH absorption and plasma current. Once the temperature of hot minority component becomes sufficiently high ~ 1 keV, the ECCD becomes significant for full current ramp-up.

Original languageEnglish
Title of host publication23rd Topical Conference on Radiofrequency Power in Plasmas
EditorsPaul T. Bonoli, Robert I. Pinsker, Xiaojie Wang
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420137
DOIs
Publication statusPublished - Sep 16 2020
Event23rd Topical Conference on Radiofrequency Power in Plasmas - Hefei, China
Duration: May 14 2019May 17 2019

Publication series

NameAIP Conference Proceedings
Volume2254
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference23rd Topical Conference on Radiofrequency Power in Plasmas
Country/TerritoryChina
CityHefei
Period5/14/195/17/19

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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