Wall conditioning of the KSTAR vacuum vessel

Kim, K.M.; Yang, H.L.; Hong, Suk–Ho; Kim, S.T.; Kim, H.T.; Kim, K.P.; Lee, K.S.; Kim, H.K.; Bak, J.S.

doi:10.1016/j.fusengdes.2009.03.002

Cited by 11 publications

(7 citation statements)

References 5 publications

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“…However, additional H atoms dissociated from carborane mother molecule world be a small problem for the density control during a following shot. Boron containing thin films deposited by boronization are hard diamond-like films with small amount of boron components with a density of 2.0-2.2 g/cm 3 , H/H+C ratio of 25-30 %.…”

Section: Discussionmentioning

confidence: 99%

“…The KSTAR GDC system has two reciprocating-type movable RF antennas at ports A and I. At the end of the antennas, a 10-turn induction coil was used to launch 300 W RF power at a frequency of 13.56 MHz to produce initial breakdown [32]. The antennas are located at the outermost position of the inner side of the ports while plasma experiments are performed, and positioned at the centre of the vacuum vessel for GDC.…”

Section: Gdc Systemmentioning

confidence: 99%

“…Because GDC doesn't work under permanent magnetic fields produced by superconducting magnets, GDC cannot be operated as an inter-shot wall conditioning method for superconducting (future) tokamak like KSTAR (Korea Superconducting Tokamak Advanced Research) and ITER (International Thermonuclear Experimental Reactor): Another wall conditioning technique such as Ion Cyclotron Wall Conditioning (ICWC) or Electron Cyclotron Wall Conditioning (ECWC) is essential. Many machines have reported that ICWC plasmas have been generated successfully in a wide range of frequency range from 10 to 100 MHz [3]. Boronization in a Glow Discharge (GD) is a standard and widely applied technique to remove oxygen impurity from a vacuum vessel.…”

Section: Introductionmentioning

confidence: 99%

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Initial phase wall conditioning in KSTAR

Hong

Kim

et al. 2011

Nucl. Fusion

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Initial phase wall conditioning in KSTAR is depicted. The KSTAR wall conditioning procedure consists of baking, Glow Discharge Cleaning (GDC), ICRH Wall Conditioning (ICWC), and boronization (Bz). The vessel baking has been performed in order to remove various kinds of impurities including H 2 O, carbon and oxygen for the plasma. The total outgassing rates in the KSTAR campaigns are compared. GDC is regularly performed as standard wall cleaning procedure. Another cleaning technique is ICWC, which is useful for intershot wall conditioning under strong magnetic field. In order to optimize operation time and removal efficiency, parameter scan has been performed. Bz is a standard technique to remove oxygen impurity from vacuum vessel. KSTAR has utilized carborane powder which is non-toxic boron containing material. The first bz has been performed successfully. Water and oxygen level in vacuum vessel have been reduced significantly. Boron containing thin films deposited by boronization are studied.

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Section: Discussionmentioning

confidence: 99%

Section: Gdc Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Initial phase wall conditioning in KSTAR

Hong

Kim

et al. 2011

Nucl. Fusion

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“…Generally high temperature baking over 150 • C is known to have a wall cleaning effect [10] while stand-alone baking with low and moderate temperature was reported to have no effect on wall conditioning [4]. However, KSTAR reported that temperature of about 110 • C had beneficial effects on wall cleaning [11].…”

Section: The Baking Systemmentioning

confidence: 99%

Development of wall conditioning and impurity monitoring systems in Versatile Experiment Spherical Torus (VEST)

Lee

Yang

Kim

et al. 2016

Fusion Engineering and Design

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“…After machine opening or a disruption, H 2 glow discharging (H 2 -GDC) is employed to clean impurity such as oxygen (including oxide) and oil absorbed on the wall [8]. Before H 2 glow discharging, strong N 2 baking is needed because H 2 -GDC cannot remove water, although it can clean much impurity evidently.…”

Section: H 2 Glow Dischargingmentioning

confidence: 99%