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Title: Design of ECH launcher for KSTAR advanced Tokamak operation

Abstract

For the advanced tokamak operation in Korea Superconducting Tokamak Advanced Research (KSTAR), up to 6 MW of electron cyclotron heating (ECH) is planned. The ECH launcher should be able to operate in steady state and serve as a central/off-axis heating and current drive, q-profile control, and control of the neoclassical tearing mode (NTM) and sawtooth. The water cooled launchers have been upgraded to include continuous operation with precise, high-speed real-time control of the beams by integration with the plasma control system (PCS) for supporting the experiments, in particular for suppressing NTM. Here, the launcher was successfully operated for 78 s with about 650 kW EC power, where the temperature of the coolant, with a flow rate of 9.6 lpm, is saturated and approximately 2 °C. The launcher control system had a maximum control cycle of 5 kHz and a motor latency of about 10 ms, and the poloidal scanning speed of the beam was 20 °/s. Additionally, for the higher localization of power deposition, the curvature and size of the mirrors in the launcher were optimized. This paper presents the ECH launcher design and its control system with the operation results.

Authors:
 [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2];  [1];  [3]
  1. National Fusion Research Institute, Daejeon (Korea, Republic of)
  2. Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1658824
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 151; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; KSTAR; ECH; Launcher; Launcher control; Advanced tokamak operation

Citation Formats

Joung, Mi, Woo, Minho, Han, Jongwon, Wang, Sonjong, Kim, Sunggug, Hahn, Sanghee, Lee, Dongjea, Kwak, Jonggu, and Ellis, Robert. Design of ECH launcher for KSTAR advanced Tokamak operation. United States: N. p., 2019. Web. https://doi.org/10.1016/j.fusengdes.2019.111395.
Joung, Mi, Woo, Minho, Han, Jongwon, Wang, Sonjong, Kim, Sunggug, Hahn, Sanghee, Lee, Dongjea, Kwak, Jonggu, & Ellis, Robert. Design of ECH launcher for KSTAR advanced Tokamak operation. United States. https://doi.org/10.1016/j.fusengdes.2019.111395
Joung, Mi, Woo, Minho, Han, Jongwon, Wang, Sonjong, Kim, Sunggug, Hahn, Sanghee, Lee, Dongjea, Kwak, Jonggu, and Ellis, Robert. Mon . "Design of ECH launcher for KSTAR advanced Tokamak operation". United States. https://doi.org/10.1016/j.fusengdes.2019.111395. https://www.osti.gov/servlets/purl/1658824.
@article{osti_1658824,
title = {Design of ECH launcher for KSTAR advanced Tokamak operation},
author = {Joung, Mi and Woo, Minho and Han, Jongwon and Wang, Sonjong and Kim, Sunggug and Hahn, Sanghee and Lee, Dongjea and Kwak, Jonggu and Ellis, Robert},
abstractNote = {For the advanced tokamak operation in Korea Superconducting Tokamak Advanced Research (KSTAR), up to 6 MW of electron cyclotron heating (ECH) is planned. The ECH launcher should be able to operate in steady state and serve as a central/off-axis heating and current drive, q-profile control, and control of the neoclassical tearing mode (NTM) and sawtooth. The water cooled launchers have been upgraded to include continuous operation with precise, high-speed real-time control of the beams by integration with the plasma control system (PCS) for supporting the experiments, in particular for suppressing NTM. Here, the launcher was successfully operated for 78 s with about 650 kW EC power, where the temperature of the coolant, with a flow rate of 9.6 lpm, is saturated and approximately 2 °C. The launcher control system had a maximum control cycle of 5 kHz and a motor latency of about 10 ms, and the poloidal scanning speed of the beam was 20 °/s. Additionally, for the higher localization of power deposition, the curvature and size of the mirrors in the launcher were optimized. This paper presents the ECH launcher design and its control system with the operation results.},
doi = {10.1016/j.fusengdes.2019.111395},
journal = {Fusion Engineering and Design},
number = ,
volume = 151,
place = {United States},
year = {2019},
month = {11}
}

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