• Title/Summary/Keyword: TOKAMAK

Search Result 182, Processing Time 0.035 seconds

Stress analysis of the KSTAR vacuum vessel under thermal and electromagnetic loads (KSTAR 진공용기 열 및 전자기력 하중에 의한 응력해석)

  • Cho, S.;Kim, J.B.;Her, N.I.;Im, K.H.;Sa, J.W.;Yu, I.K.;Kim, Y.C.;Do, C.J.;Kwon, M.
    • Proceedings of the KSME Conference
    • /
    • 2001.06d
    • /
    • pp.325-330
    • /
    • 2001

  • One of the principal components of the KSTAR (Korea Superconducting Tokamak Advanced Research) tokamak structure is the vacuum vessel, which acts as the high vacuum boundary for the plasma and also provides the structural support for internal components. Hyundai Heavy Industries Inc. has performed the engineering design of the vacuum vessel. Here the overall configuration of the KSTAR vacuum vessel was briefly described and then the design methodology and the analysis results were presented. The vacuum vessel consists of double walls, several ports, leaf spring style supports. Double walls are separated by reinforcing ribs and filled with baking/shielding water. The overall external dimensions of the main body are 3.39 m high, 1.11 m inner radius, 2.99 m outer radius, and made of SA240-316LN. The vacuum vessel was designed to be capable of achieving the base pressure of $1\times10^{-8}$ Torr, and also to be structurally capable of sustaining the vacuum pressure, the electromagnetic and thermal loads during plasma disruption and bakeout, respectively. The vacuum vessel will be baked out maximum $150^{\circ}C$ by hot pressurized water through the channels formed between double walls and the reinforcing ribs. A 3-D temperature distribution and the resulting thermal loads in the vessel were calculated during bakeout. It was found that the vacuum vessel and its supports were structurally rigid based on the thermal stress analysis. The maximum electromagnetic loads on the vacuum vessel induced by eddy and halo currents resulting from the engineering plasma radial and vertical disruption scenarios have been estimated. The stress analyses have been performed based on these electromagnetic loads and the resulting stresses at he critical locations of the vacuum vessel were within the allowable stresses.

  • PDF

Development of simple and continuous microwave source using a microwave oven (전자오븐을 이용한 간편하고 연속적인 마이크로파 발생 장치 개발)

  • 권기청;김재현;김정희;이효석;전상진;허승회;최원호
    • Journal of the Korean Vacuum Society
    • /
    • v.9 no.3
    • /
    • pp.290-295
    • /
    • 2000

  • In order to utilize as a pre-ionization means for reproducible ohmic plasma on KAIST-TOKAMAK, a simple, safe, economical and continuous microwave source has been developed using a home kitchen micro-wave oven. The magnetron used in the study can provide 500 W of power at 2.45 GHz. A conventional magnetron in a home kitchen microwave oven generates microwave for 8 ms at every 16 ms periodically due to the periodic (60 Hz) high voltage applied to the magnetron cathode. In order to generate continuous microwave which is suitable for tokamak pre-ionization, the magnetron operation circuit has been modified using a DC high voltage (5 kV, 1 A) power supply. It provides high-voltage with small ripple for magnetron cathode bias. Using the developed magnetron system, electron cyclotron resonace heated (ECH) plasmas were produced and the characteristics of the system were studied by diagnosing the ECH plasma using Langmuir probe and $H_{\alpha}$ emission diagnostics.

  • PDF

Measurement of the ICRH antenna phasing using antenna strap probe based diagnostic system in EAST tokamak

  • Liu, L.N.;Liang, Q.C.;Yang, H.;Zhang, X.J.;Yuan, S.;Mao, Y.Z.;Zhang, W.;Zhu, G.H.;Wang, L.;Qin, C.M.;Zhao, Y.P.;Cheng, Y.;Zhang, K.
    • Nuclear Engineering and Technology
    • /
    • v.54 no.10
    • /
    • pp.3614-3619
    • /
    • 2022

  • To operate the ion cyclotron resonance heating (ICRH) antennas in a better heating state and produce relatively low impurities, it is necessary to control the antenna spectrum by changing the antenna phasing. As the electrical length of the antenna feeding transmission lines is changing as a matter of the standing wave pattern at the ceramic supports, 90° elbows, T-connectors and antenna loops, we chose to measure the current at the grounding points of the antenna loops by antenna strap probe. The voltage drops along a small, several millimeter-long paths at the end of the antenna loops give a signal that is proportional to the current in the antenna loop. Through the simulation of the antenna strap probe and the actual measurement of the antenna phasing under vacuum conditions, the reliability of the antenna strap probe based diagnostic system have been successfully proved. Moreover, this system was successfully applied to the ICRH daily experiments in the spring of 2021. In the near future, the active real-time feedback control of the antenna phasing system will be developed based on this diagnostic system in the EAST tokamak.

  • https://doi.org/10.1016/j.net.2022.05.030 인용 PDF KSCI