Ion cyclotron resonance for fast magnetosonic waves in small tokamaks

The absorption of fast magnetosonic waves in a small-size tokamak has been studied under the multiple cyclotron resonance for bulk ions and under the fundamental resonance for minority ions. The small plasma radius is assumed to be less than or equal to, in the order of magnitude, the transverse wavelength. In this case, the solution to the linearized Vlasov equation for the distribution function of the resonance ions in the form of a power series in their Larmor radius and the expression for the contribution from resonance ions into the wave current density have been obtained. The nonlocal coupling between the wave field and current density in a small azimuth angle has been taken into account, which is associated with the motion of resonance ions along a magnetic line of force while travelling through the cyclotron resonance zone, with consideration for the nonuniform magnetic field along a line of force. Allowances have been also made for the decorrelation effects connected with the Coulomb collisions between the resonance particles during their travelling across the successive zones of the resonance, which effects lead to the dephasing of the particle-wave phase. The expressions for the RF power absorbed in the tokamak plasma have been obtained and analyzed

Dynamic of wall currents in pulse plasma diode in tin vapor

In the paper the level of high-current pulse discharge plasma influence on the chamber wall is carried out, that is important for position choosing of the nanolithographer first collecting mirror with gas-discharge radiation source. In the high-current pulse discharge in tin vapor the dynamic of wall currents space distribution and power of wall effect were experimentally investigated. It has been shown, that the ring area in anode flat is undergone by main influence. It was detected the rapid decreasing of energetic wall effect at distance from discharge axis increasing from 8 to 12 cm.Досліджується рівень впливу плазми сильнострумового імпульсного розряду на стінку камери, що важливо для вибору місця розташування першого дзеркала нанолітографу, що збирає з газорозрядним джерелом випромінювання. В сильнострумовому імпульсному розряді в парах олова експериментально вивчена динаміка просторового розподілення пристінних струмів та потужності впливу на стінку. Показано, що найбільшому впливу підлягає кільцева область в площині аноду. Виявлено різкий спад енергетичного впливу на стінку при збільшені відстані від осі розряду з 8 до 12 см.Исследуется уровень воздействия плазмы сильноточного импульсного разряда на стенку камеры, что важно для выбора месторасположения первого собирающего зеркала нанолитографа с газоразрядным источником излучения. В сильноточном импульсном разряде в парах олова экспериментально изучена динамика пространственного распределения пристеночных токов и мощности воздействия на стенку. Показано, что наибольшему воздействию подвергается кольцевая область в плоскости анода. Обнаружено резкое спадение энергетического воздействия на стенку при увеличении расстояния от оси разряда с 8 до 12 см

Ion cyclotron resonance for fast magnetosonic wavesin adiabatic traps

The absorption of the electromagnetic waves in low-pressure plasma has been investigated in the axial-symmetric adiabatic trap under the cyclotron-resonance condition. The plasma radius is assumed to be greater than or equal to, to the order of magnitude, the transverse wavelength. In this case the solution to the linearized kinetic equation for resonance ions has been obtained as a power series in ion Larmor radius of the order of ρi²ⁿ⁻² as well as the expressions for the contribution from resonance ions into the wave electric current density and RF power absorbed by the plasma (n is the resonance multiplicity)