ICRF (ion cyclotron range of frequencies) discharge cleaning with a toroidal field and an additional vertical field was carried out on EAST recently. With the injected ICRF power of 10 kW, He pressure of 10−3 Pa, toroidal field of 0.5 T and vertical field of 0.01 T, ICRF plasmas became approximately symmetric in both major radial and vertical directions, and the removal rate of hydrogen increased by 32%. A comparison of ICRF discharge cleaning between stainless steel and graphite walls was carried out, which showed that ICRF plasmas had a similar effect on the first walls of both materials. ICRF discharge cleaning between plasma shots after a major disruption was studied in detail, and it was observed that ICRF discharge cleaning under a toroidal field of 2 T was effective in recovering plasma performance quickly after a major disruption.
EAST装置において、トロイダル磁場と追加の垂直磁場を用いたICRF（イオンサイクロトロン周波数帯）放電洗浄を最近実施した。投入ICRFパワー10 kW、ヘリウム圧力10⁻³ Pa、トロイダル磁場0.5 T、垂直磁場0.01 Tの条件下で、ICRFプラズマは大半径方向および垂直方向の両方においてほぼ対称となった。また、水素の除去率は32%増加した。ステンレス鋼壁とグラファイト壁におけるICRF放電洗浄の比較を行った結果、両材料の第一壁に対してICRFプラズマは同様の効果を示すことが明らかとなった。さらに、大ディスラプション後のプラズマショット間におけるICRF放電洗浄を詳細に調査し、トロイダル磁場2 Tの条件下でのICRF放電洗浄が、大ディスラプション後のプラズマ性能の迅速な回復に有効であることを観測した。