Vapor Shielding of Solid Targets Exposed to High Heat Flux

Pulse Shape Dependence of Vapor Shielding Efficiencies During Transient Heat Loads

“…When a large amount of vapor is ejected from the plasma-facing surface, the vapor shielding reduces the incoming plasma energy due to the interaction between the vapor and the plasma. Numbers of studies have been conducted for the vapor shielding by experiments [15,16] and simulations [17][18][19], and erosion suppression effects of vapor shielding were confirmed. However, these studies did not carefully consider the impact of the pulse shape on the vapor shielding effects.…”

Proton impact charge exchange and excitation cross sections for liquid Sn divertor studies

“…The theoretical and experimental investigation of these processes have been an active field of research for many decades and is described in many monographs and textbooks (e.g., [1][2][3] , and references therein). [10,11] The evaluation of shielding capability of the near-surface secondary plasma layer requires knowledge of inelastic and momentum transfer processes of incoming flux particles and the Sn atoms released from the PFC surfaces. Detailed theoretical studies of electron capture and excitation processes in many-electron collision systems are rather limited because of the electronic structure complexity and the plethora of possible reaction channels.…”