Progress of the KSTAR ICRF components development for long pulse operation

Hong, Bong Guen; Bae, Y.D.; Hwang, C.K.; Kwak, J.G.; Wang, S.J.; Yoon, Jae Sung

doi:10.1016/j.fusengdes.2005.06.226

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Cooling channels are incorporated inside the current strap, Faraday shield, cavity wall and vacuum transmission line (VTL) to remove the dissipated RF power and incoming plasma heat loads. Significant improvement in the antenna performance was evident with active cooling as compared with no cooling [4]. During the test campaign in 2005, we performed the RF tests with an active cooling of the antenna and the transmission line.…”

Section: Icrf Heating Systemmentioning

confidence: 99%

Progress in the development of heating systems towards long pulse operation for KSTAR

et al. 2007

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Construction of the Korea superconducting tokamak advanced research (KSTAR) tokamak is in its final phase. For the long-pulse KSTAR discharges, the ion cyclotron range of frequencies (ICRF) and neutral beam injection (NBI) heating systems are expected to play important roles through a selective heating of ions and electrons, control of the plasma pressure and current profiles, a core fuelling and beam diagnostics for the KSTAR. In addition, the ICRF system is expected to be used for possible discharge cleaning and assisting in the tokamak startup. In this paper, the recent progress in the development of the ICRF and the NBI heating systems is described. The four-strap ICRF antenna has been successfully tested for a voltage up to 41 kV for a pulse length of 300 s (to 46 kV for 20 s) in a test chamber. A prototype KSTAR NBI system has been developed. At present, the system has successfully produced a 1 MW beam power for 200 s and a 3.5 MW output beam power for 4 s.

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Section: Icrf Heating Systemmentioning

confidence: 99%

Progress in the development of heating systems towards long pulse operation for KSTAR

et al. 2007

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“…The KSTAR ICRF system will deliver 6 MW of RF power to the plasma. This system has been under development for ten years [4][5][6][7][8]. The KSTAR ICRF antenna is composed of four center-grounded current straps located in cavities separated toroidally by septa and screened by a single-layer Faraday shield, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

RF Power Dissipation on the KSTAR ICRF Antenna

Bae¹,

Kwak²,

Wang³

et al. 2007

JKPS

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The KSTAR (Korea Superconducting Tokamak Advanced Research) ICRF (ion cyclotron range of frequency) antenna system has Faraday shield tubes to protect it from direct exposure to the plasma environment. The RF heating profiles on the Faraday shield and on the current strap of the KSTAR ICRF antenna were theoretically studied and compared with experimental results. The poloidal configuration of the magnetic field was calculated by using a commercial 2-D FEM (finite element method) code, from which the heat load profile along the circumference of the Faraday shield surface was deduced. The heat loads on the top and the bottom surfaces facing the adjacent Faraday shield were found to be relatively high. The toroidal configuration of the magnetic field was calculated, and the toroidal profiles of the heat loads on the Faraday shield and the strap were deduced. The heat load has a maximum value at the joining position of the Faraday shield with the cavity wall. The heat loads on both the rounded edges of the current strap were found to be relatively high. For a strap current of 677 A (peak), which corresponds to a maximum voltage of 30.0 kVp, the maximum heat loads on the Faraday shield and on the current strap were 381 and 57 kW/m 2 , respectively, at a frequency of 30 MHz. A RF test was performed to investigate the standoff capability of the antenna without any cooling. In that test, we measured the temperature profiles on the Faraday shield and on the current strap by using an IR camera and then compared the results with the calculated heat loads. The maximum temperature of the Faraday shield was 374 • C for a maximum voltage of 30.0 kVp and a pulse length of 66 s. The temperature profiles agreed well with the calculated heat load profiles.

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