The TCV Vacuum Vessel: Design and Construction

Sideways forces on asymmetric tokamak walls during plasma disruptions

“…Though the port size in figures 1-3 and 6(b)-(e) is made relatively large, it is not exaggerated too much. For comparison, the toroidal extension of large round on the top of TCV vessel is just 1.5 times smaller than considered in this paper: Δζ = 2π/16 vs 3π/16 [35]. However, an opening of about Δζ = π/16 is more typical for the majority of tokamak walls [37,[46][47][48].…”

“…On the other hand, the employed lumpedmass models might be an over-simplification. To obtain a more reliable scaling of the sideways force, in 2018, the ITPA Topical Group on MHD, Disruptions & Control launched a new joint experiment MDC-25 on asymmetric forces that includes tokamaks with simpler vessels and/or vessel supports: COM-PASS [8,34], TCV [35], AUG [23], DIII-D [36] and JT-60SA [37]. But in contrast to the JET torus made of eight identical octants, the walls of the above-mentioned devices have irregularly situated ports, that deviate the eddy current and, therefore, alter the disruption forces.…”