The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The transient 3D electromagnetic Particle-In-Cell [1,2] code HALO3D operates on unstructured meshes. It uses a high order discontinuous Galerkin approach to discretize the full set of the Maxwell equations in time domain. HALO3D is designed to be highly scalable, being able to simulate even high frequency particle-wave interactions and field propagation in state-of-the-art gyrotrons. Very recently,...
Fast design codes for the simulation of the particle-field interaction in the interior of highly nonlinear gyrotron resonators are state of the art tools for gyrotron design [1,2]. While procuring their rapidity by making strong physical simplifications and approximations, the correctness of these assumptions is not known to be valid for all considered variations of the geometry and operation setup...
In order to model pulsed plasma thrusters, the hybrid code Pi-cLas is under development. This code is based on particle-in-cell (PIC) and direct simulation Monte Carlo techniques for the solution of the Boltzmann equation for rarefied plasma flows, where continuum assumptions fail. In the present paper the focus is on appropriate models to include intraspecies charged particle-especially electron-electron-interactions...
In a negative-ion source, the vibrational kinetics of molecules H2 and the negative-ion H- transport are both important in order to understand and optimize H- extraction. In this paper, two different particle models are developed, simulating the expansion and extraction regions of a radio-frequency inductively coupled plasma negative-ion source. These models show the importance of gas- and plasma-surface...
We have developed uniform-fill nozzles for long-implosion PRS experiments to produce argon K-shell x-rays (photon energy > 3.1 keV). With a 7 cm diameter nozzle, which is appropriate for a 200 ns driver, we have achieved a stable implosion at 180 ns and 4 MA with peak argon K-shell yields exceeding 15 kJ. As previously seen with short (∼100 ns) implosion times, the K-shell yield scales as the fourth...
Diagnostics have been developed for use on superpower generators with fast Z-pinch loads and are used to characterize the electrical power flow and the imploding plasma load. X-ray diagnostics include both grazing incidence grating and crystal spectrographs, an X-ray framing camera, arrays of bare and filtered X-ray diodes, calorimeters, and ruby laser holographic interferometry. Plans include an...
The development of fast Z-pinch technology at Physics International Company using generators with peak powers ≥ 1012 W and ∼ 100 ns pulsewidths has produced argon plasmas with Te up to 1–2 keV, and ne = 1020 → 2 × 1021/cm3 from wire arrays and a gas puff technique. Results from gas puff experiments using the 5 TW PITHON generator are described. It is shown that modest extrapolations of the parameters...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.