“…After the repair, the first wall is conditioned using various methods such as the baking of vacuum vessel, glow discharge cleaning (GDC), high frequency glow discharge (HF GDC), electron cyclotron resonance (ECR) discharge cleaning, and ion cyclotron resonant (ICR) discharge cleaning [3,4]. It often takes several days to perform this conditioning of the wall, and it takes a lot of effort to recover [5][6][7]. Even worse, in some cases, a leak with small deterioration that is smaller than the fluctuation range of the degree of vacuum during the experiment may occur.…”