Abstract
We describe herein for the first time a full circuit model for electromagnetic pulse transmission in the Primary Test Stand (PTS)---the first TW class pulsed power driver in China. The PTS is designed to generate 8--10 MA current into a $z$-pinch load in nearly 90 ns rise time for inertial confinement fusion and other high energy density physics research. The PTS facility has four conical magnetic insulation transmission lines, in which electron current loss exists during the establishment of magnetic insulation. At the same time, equivalent resistance of switches and equivalent inductance of pinch changes with time. However, none of these models are included in a commercially developed circuit code so far. Therefore, in order to characterize the electromagnetic transmission process in the PTS, a full circuit model, in which switch resistance, magnetic insulation transmission line current loss and a time-dependent load can be taken into account, was developed. Circuit topology and an equivalent circuit model of the facility were introduced. Pulse transmission calculation of shot 0057 was demonstrated with the corresponding code FAST (full-circuit analysis and simulation tool) by setting controllable parameters the same as in the experiment. Preliminary full circuit simulation results for electromagnetic pulse transmission to the load are presented. Although divergences exist between calculated and experimentally obtained waveforms before the vacuum section, consistency with load current is satisfactory, especially at the rising edge.
Highlights
Since the breakthrough in x-ray power generation achieved in the 1990s when a series of wire array experiments were conducted on the Saturn generator and the Z-machine of the Sandia National Laboratories [1,2,3] that demonstrated extremely intense x-ray emission, use of z-pinches has been regarded as one promising route for achieving inertial confinement fusion [4,5,6,7,8,9,10]
A full circuit model for electromagnetic pulse transmission for the pulsed power driver Primary Test Stand (PTS) was introduced, in which all inductances and capacitances were transformed into transmission line (TL) elements, and the pulse transmission from the Marx generator to the load can be calculated with a TL algorithm
Time dependent characteristics were introduced into the corresponding code full-circuit analysis and simulation tool (FAST)
Summary
Since the breakthrough in x-ray power generation achieved in the 1990s when a series of wire array experiments were conducted on the Saturn generator and the Z-machine of the Sandia National Laboratories [1,2,3] that demonstrated extremely intense x-ray emission, use of z-pinches has been regarded as one promising route for achieving inertial confinement fusion [4,5,6,7,8,9,10]. Circuit codes are very important during the operation phase of pulsed power systems They can be used to understand how the components behave, and to predict the output pulses before experiments. Multiphysical software which includes circuit, field and PIC packages is becoming commercial available [16,17] full circuit simulation is still a cheap and fast way to determine the baseline for a totally new or modified pulsed power accelerator [18,19]. Theoretical concepts for magnetic insulation or magnetohydrodynamic (MHD) models for the load [30] In those codes, an incident wave or equivalent voltage source at the boundaries of the MITL is often used to drive an equivalent circuit thereafter. A full circuit model for the PTS facility is introduced This model allows adding time-dependent parameters for switches, MITL and load.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
