@article{oai:repo.qst.go.jp:00049570,
 author = {横山達也 and 三善, 悠矢 and 日渡, 良爾 and 諫山, 明彦 and 松永, 剛 and 大山, 直幸 and 五十嵐康彦 and 岡田真人 and 小川雄一 and Miyoshi, Yuuya and Hiwatari, Ryoji and Isayama, Akihiko and Matsunaga, Go and Oyama, Naoyuki},
 journal = {Fusion Engineering and Design},
 month = {Mar},
 note = {Disruption is a critical phenomenon in a tokamak reactor. Although disruption causes serious damage to the reactor, its physical mechanism remains unclear. To realize a tokamak reactor, it is necessary to understand and control the disruption phenomenon. The present research constructs a disruption predictor using experimental high-beta plasma data in the JT-60U tokamak. The predictor was constructed using a support vector machine as a linear discriminant, and we focus on a variable selection problem for the binary classification by sparse modeling, specifically, exhaustively searching the best combinations of variables which maximize the predictor performance. By the sparse modeling, we found that the six input parameters as the best combinations. The selected parameters were the n = 1 mode amplitude |Brn=1| and its time derivative d|Brn=1|/dt, the plasma density (relative to the Greenwald density limit) and its time derivative, and the time derivatives of the plasma internal inductance and plasma elongation. In particular, it was identified that the parameter d|Brn=1|/dt, plays a key role on plasma disruption. We should notice that the combination with other plasma parameters is indispensable and remarkably make it possible to improve the performance of disruption prediction.},
 pages = {67--80},
 title = {Prediction of high-beta disruptions in JT-60U based on sparse modeling  using exhaustive search},
 volume = {140},
 year = {2019}
}