نتایج جستجو برای: plasma sheath
تعداد نتایج: 368900 فیلتر نتایج به سال:
The source frequency has a strong influence on plasma characteristics in RF discharges. Multiple sources at widely different frequencies are often simultaneously used to separately optimize the magnitude and energy of ion fluxes to the substrate. In doing so, the sources are relatively independent of each other. These sources can, however, nonlinearly interact if the frequencies are sufficientl...
The dynamics of magnetic fields with an amplitude of several tens of megagauss, generated at both sides of a solid target irradiated with a high-intensity (~10(19) W/cm(2)) picosecond laser pulse, has been spatially and temporally resolved using a proton imaging technique. The amplitude of the magnetic fields is sufficiently large to have a constraining effect on the radial expansion of the pla...
Present contribution deals with the role of weak but finite electron inertia on the sheath formation condition. As reported earlier this becomes effective when the ions’ drift velocity exceeds the phase velocity of the acoustic wave fluctuations. Such situation has natural existence near the sheath edge. Keeping this in mind we have revisited the problem of usual Bohm sheath condition. Analytic...
Sheath characteristics in collisional magnetized plasma with nonextensive electrons and thermal ions
Sheath formation and its characteristics are studied in collisional magnetized plasma consisting of nonextensive electrons thermal ions. Using two-fluid model, the Bohm criterion for ion velocity is deduced as a function parameters shown that ion-neutral collisions impose an upper limit criterion. It also found deviation from standard Maxwellian distribution significantly affects sheath charact...
در این رساله سعی شده ابتدا دینامیک رفتار لایه های جریان در دو فاز حرکت شتاب گیری محوری و تراکم شعاعی یک دستگاه پلاسمای کانونی نوعی با استفاده از معادلات مومنتوم بررسی شود. در فاز پلاسمای پینچ شده روابطی برای جریان، چگالی جرمی، شعاع، فشار و دمای پینچ بیان شده است. تولید نوترون گرما هسته ای با دو مدل گرما هسته ای استاتیک و بویلر متحرک بررسی شده و برای میزان تولید نوترون هر دو مدل روابطی به صورت ت...
Large area, high frequency capacitively coupled plasmas (CCP's) [1-6], widely used for semiconductor and thin film fabrication, require extreme processing uniformity. Large area allows increased production, and higher frequency gives smaller sheath widths and voltages. The latter leads to a decrease in the ion bombarding energy, and higher ion fluxes at the wafer, which are desirable for proces...
The presence of a satellite disturbs the ambient plasma. The charging of the spacecraft creates a sheath around it, and the motion of the satellite creates a wake disturbance. This modification of the plasma environment introduces difficulties in measuring electric fields and plasma densities using the probe technique. We present a study of the structure of the sheath and wake around the Astrid...
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