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A generalization of the locally corrected Nyström (LCN) discretization method is outlined wherein sparse transformations of the LCN system matrix are obtained via singular- value decompositions of local constraint matrices. The local constraint matrices are used to impose normal continuity of the currents across boundaries shared by mesh elements. Due to the method’s simplicity and flexibility, it...
GaAs based heterojunction bipolar transistors are used in microwave oscillators to provide low phase noise operation. Prediction of phase noise requires transistor models to be accurate at low frequencies as well. Measurements of low frequency noise and network parameters however, are not straight forward because of the instabilities of the transistor in the measurement setup. We designed and built...
Summary form only given. For pulsed power machines with an inductive voltage adder (IVA) architecture and a magnetically insulated transmission line (MITL), positive polarity operation results in layered MITL flow as emitted electrons are born at different potentials in each of the adder cells. Because of this layered flow, the usual prediction of the voltage using the Mendel formula is not accurate...
Light-ion ICF requires the development of diodes which can efficiently produce high-brightness ion beams, and which can aim the ions in a narrow cone towards a cm-diameter fusion target or transport-channel. Since candidate ion species span protons to carbon ions, diode behavior must be studied in a range of acceleration voltages (2–8 MV) and impendences (1–10 Ω). NRL has developed a broad experimental...
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