Simulation of damage to tokamaks plasma facing components during intense abnormal power deposition

Genco, Filippo; Hassanein, A.

doi:10.1016/j.fusengdes.2014.02.057

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…Equation ( 28), which relates κ to the shielding coefficient, implies Equation ( 76) is equivalent to Equation (27) for the current potential of a shell that is a continuous conductor.…”

Section: E Current Potential For a Conducting Shellmentioning

confidence: 99%

“…We consider effects due to magnetic forces, which could be greatly enhanced by electrical shorts between the beryllium tiles covering the first wall. A possible cause of shorting is tile melting [26,27]. The actual melt damage seen on the JET ITER-like Wall and divertor is illustrated and discussed in [20].…”

Section: Implications For the Study Of Off-normal Eventsmentioning

confidence: 99%

“…using the results for the jump in the tangential magnetic field. This equation for κ is equivalent to Equation (27).…”

Section: Data Availability Statementmentioning

confidence: 99%

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The interaction of the ITER first wall with magnetic perturbations

Boozer

2020

Preprint

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Mitigation of the multiple risks associated with disruptions and runaway electrons in tokamaks involves competing demands. Success requires that each risk be understood sufficiently that appropriate compromises can be made. Here the focus is on the interaction of short timescale magneticperturbations with the structure in ITER that is closest to the plasma, blanket modules covered by separated beryllium tiles. The effect of this tiled surface on the perturbations and on the forces on structures are subtle. Indeterminacy can be introduced by tile-to-tile shorting. A determinate subtlety is introduced because electrically separated tiles can act as a conducting surface for magnetic perturbations that have a normal component to the surface. A practical method for including this determinate subtlety into plasma simulations is developed. The shorter the timescales and the greater the localization, particularly in the toroidal direction, the more important the magnetic effects of the tiles become.

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“…Equation ( 28), which relates κ to the shielding coefficient, implies Equation ( 76) is equivalent to Equation (27) for the current potential of a shell that is a continuous conductor.…”

Section: E Current Potential For a Conducting Shellmentioning

confidence: 99%

Section: Implications For the Study Of Off-normal Eventsmentioning

confidence: 99%

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The interaction of the ITER first wall with magnetic perturbations

Boozer

2020

Preprint

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“…The strength of the matrix elements is proportional to the overlap <k | l> of the wave functions of coupled states |k >, |l > , and therefore, H ii , H jj are localized dominantly near the pertinent atom, while K ij , K ji are distributed on the internuclear axis at distances relatively far from the atoms. [2,16] Figure 1 but for capture to 2l states of H In Figures 1-5, we show the cross sections for electron capture from the singlet (panels [a]) and triplet (panels [b]) initial Sn(5 2 5 21,3 ) and the total (c), Equation (10), to the 1s states and 2l, 3l, 4l, and 5l states of hydrogen atom. When the states |k >, |l > belong to different atomic centres, the condition E k = E l ensures a strong (resonant) coupling between the states.…”

Section: Electron Capture Cross Sectionsmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Janev

Jakimovski

2019

Contributions to Plasma Physics

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The quantum dynamics of charge exchange (electron capture) and excitation processes in proton collisions with Sn atoms is studied for the first time by using the two-centre atomic orbital close coupling method. The expansion basis includes the lowest nine states of singlet and triplet symmetry of Sn and all the states with n ≤ 8 of the H atom. The spin-resolved state-selective charge exchange (up to n = 5) and excitation cross sections are calculated in the energy range of 0.5 − 100 keV. Strong coupling between the electron capture and excitation channels is observed in the low-energy (E ≤ 10 keV) region associated with the energy quasi-resonance of some projectile and target states. The intensities of some strong Sn spectral lines are also calculated for a number of typical tokamak edge plasma temperatures. K E Y W O R D Sdivertor, electron capture, plasma

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