Study of the effects of ECh power and pulse length on preionization in the KSTAR Tokamak

Bae, Y.S.; Namkung, W.; Cho, Moo Hyun; England, A.C.

doi:10.1109/tps.2003.815474

Cited by 7 publications

(2 citation statements)

References 14 publications

(24 reference statements)

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“…The TPC shot, #12400, is benchmarked with the 0D plasma evolution code, TECHP0D [16,17]. It has been found that the improved confinement of the ECH pre-ionization plasma due to the particle trapping in the mirror structure is essential to enhance the start-up performance of TPC over FNC even though its connection length is smaller [14].…”

Section: Benchmarking Of Tpc Experiments With Techp0d With An Improve...mentioning

confidence: 99%

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Study on ECH-assisted start-up using trapped particle configuration in KSTAR and application to ITER

Lee

Kim

et al. 2017

Nucl. Fusion

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ECH-assisted start-up using trapped particle configuration (TPC) is firstly studied in a superconducting, conventional tokamak, KSTAR. First, improved and efficient start-up using TPC than conventional field null configuration (FNC) is achieved by enhanced pre-ionization plasma quality. TPC shows the broader operation window in terms of the poloidal field quality and the deuterium prefill pressure than that of FNC. Surprisingly the particle trapping enhances the plasma start-up performance even with much lower particle trapping ratio than that of spherical torus. Reliability of TPC with low trapping ratio is investigated by 0D plasma evolution code, TECHP0D. Second, the characteristics of TPC start-up are explored with experiments and modellings. Two kind of start-up failure conditions are identified by the magnetic pitch and prefill pressure scan experiments: (i) low ionization rate; and (ii) low density condition. These experimental observation has consistency with TECHP0D modeling result. Finally, reliable ITER-relevant low toroidal electric field start-up using TPC is achieved with drastically improved success rate of start-up in KSTAR. In this experiments, validity of the ITER-like toroidally inclined ECH/ECCD injection is also expected. Time dependent ITER start-up scenario using TPC is proposed and the superiority of it than FNC is discussed.

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Section: Benchmarking Of Tpc Experiments With Techp0d With An Improve...mentioning

confidence: 99%

“…In this research we would like apply the TPC scenario to KSTAR to demonstrate its efficiency and reliability in a conventional, superconducting tokamak. We will evaluate it with dedicated experiments and 0D start-up analysis, TECHP0D [16,17]. The article is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Study on ECH-assisted start-up using trapped particle configuration in KSTAR and application to ITER

Lee

Kim

et al. 2017

Nucl. Fusion

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Design and operation results of KSTAR ECH system

Joung,

Wang,

Kim

et al. 2024

Fusion Engineering and Design

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Parameter space validation through OOPS simulations of plasma burnthrough and discharge evolution in the SST-1 tokamak

et al. 2020

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Plasma burnthrough and current ramp-up phases in an SST-1 superconducting tokamak are simulated by the OOPS code. The main purpose of this study is to optimize the operation regime in SST-1 through the input parameter scan for OOPS for both successful and failed shots from the SST-1 database. SST-1 is now equipped with carbon plasma facing components (PFCs). Hence, PFCs are expected to offer a carbon dominated impurity environment. An electrically continuous vacuum vessel and cryostat hinder sufficient loop voltage during start-up, thereby rendering electron cyclotron resonance heating (ECRH) pre-ionization an absolute requirement. OOPS simulation is optimized for the essential plasma initiation parameters like the seed electron density ne = 3 × 1017/m3 and the initial neutral density n0 = 1–4 × 1018/m3 (corresponding to a tailored pre-fill pressure) and for an error magnetic field Berr ≤ 20 G. The simulation shows that the ECRH pre-ionization threshold power required for the successful plasma start-up under low available loop voltage conditions is ≥180 kW.

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Study of the effects of ECh power and pulse length on preionization in the KSTAR Tokamak

Cited by 7 publications

References 14 publications

Study on ECH-assisted start-up using trapped particle configuration in KSTAR and application to ITER

Study on ECH-assisted start-up using trapped particle configuration in KSTAR and application to ITER

Design and operation results of KSTAR ECH system

Parameter space validation through OOPS simulations of plasma burnthrough and discharge evolution in the SST-1 tokamak

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