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Effect of Plasma Density on Proton Acceleration in a Rectangular Waveguide

Plasma Science and Technology 2004年第5期6卷 2456-2458页

作者： hitendra k.malik Department of Physics Indian Institute of Technology DelhiNew Delhi-110016Indianalytical studies are made for the proton acceleration during its motion in thefields of the fundamental mode excited by a high-intensity microwave in a rectangular waveguidewhen the proton is injected along the propagating direction of the mode. The trajectory of theproton is calculated and the expressions are obtained for the energy gain and acceleration gradienttogether with the effects of plasma density microwave frequency and waveguide width. Energygain of 181 keV is attained by a 50 keV proton in a 0.015m×0.020 m evacuated waveguide when0.5×10~(10)W/m~2 microwave intensity is used. However this gain increases to 1387 keV whenthe waveguide is filled with a plasma having a density of 1.0×10~(19) m~(-3). Higher accelerationgradients are achieved when the proton is injected with a higher initial energy and also when themicrowave intensity increases. The effects of the microwave frequency and width of the waveguideare found to decrease the acceleration gradient.

Analytical studies are made for the proton acceleration during its motion inthe fields of the fundamental mode excited by a high-intensity microwave in a rectangular waveguide,when the proton is injected along the propagating direction of the mode. The trajectory of theproton is calculated and the expressions are obtained for the energy gain and acceleration gradienttogether with the effects of plasma density, microwave frequency and waveguide width. Energy gain of181 keV is attained by a 50 keV proton in a 0.015m x 0.020 m evacuated waveguide when 0.5 x 10^(10)W/m^2 microwave intensity is used. However, this gain increases to 1387 keV when the waveguide isfilled with a plasma having a density of 1.0 x 10^(19) m^(-3). Higher acceleration gradients areachieved when the proton is injected with a higher initial energy and also when the microwaveintensity increases. The effects of the microwave frequency and width of the waveguide are found todecrease the acceleration gradient.

关键词： proton acceleration microwave fundamental mode

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Modelling of electronegative collisional warm plasma for plasma-surface interaction process

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Plasma Science and Technology 2021年第4期23卷 48-54页

作者： Rajat DHAWAN hitendra k.malik Plasma Science and Technology Laboratory Department of PhysicsIndian Institute of Technology DelhiNew Delhi—110016India

An electronegative collisional plasma having warm and massive positive ions,non-extensive distributed electrons and Boltzmann distributed negative ions is modelled for the plasma-surface interaction process that is used for the surface *** the sheath formation is evaluated through the Bohm’s criterion,which is found to be modified,and the variation of the sheath thickness and profiles of the density of plasma species and the net space charge density in the sheath region in addition to the electric *** effect of ion temperature,nonextensivity and collisional parameter is examined in greater detail considering the collisional cross-section to obey power-law dependency on the positive ion *** positive ions are found to enter in the sheath region at lower velocities in the collisional plasma compared to the case of collision-less plasma;this velocity sees minuscule reduction with increasing *** increasing ion temperature and collisional parameter lead to the formation of sheath with smaller thickness.

关键词： electronegative sheath ion temperature non-extensivity sheath thickness power-law dependency collisions

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