Abstract
The typical rise time of PTS machine is ∼110 ns with about 10 MA peak current under short pulse mode when all 24 modules discharge simultaneously. By distributing the trigger times of 12 laser beams logically and adjusting the statues of the pulse output switches, longer rise-time pulse can be obtained on the PTS facility. Based on the required pulse shape, whole circuit simulations will be used to calculate the trigger times of each laser triggering gas switch and the status of the pulse output switches. The rise time of the current is determined by the time difference between the first and last trigged laser triggering gas switches. In order to trigger the laser triggering gas switch, sufficient laser power is needed to be sent into the gap of the gas switches. The gas pressure and voltage difference on the two electrodes of the gas switches also affect the triggering of the gas switches, and the voltage added on the gas switch is determined by its transition time. Traditionally the trigger time difference should be less than the transition time of the two neighboring modules. A new simulation model of PTS shows one can break this transition time limits. Series of current pulse shaping experiments have been investigated on the PTS (Primary Test Stand). As results, more than 5 MA peak current were successfully achieved on the load with a rise time of 600 ns. This study and experiments of the pulse shaping on PTS demonstrate the adaptable ability of the PTS for offering different waveform of mega ampere current pulse for different research purpose.
Highlights
The Primary Test Stand (PTS)[1,2,3] is the first TW class pulsed power device in China
Each section contains two modules, each module consists of a Marx generator, an intermediate storage water capacitor (IS), a laser triggered gas switch (LTGS),[4,5] a pulse forming line (PFL), a water switch and a triplate output transmission line (OTL)
In order to obtain a current pulse with required shape, the modules of PTS need to be careful grouped besides choosing suitable laser trigger times
Summary
The Primary Test Stand (PTS)[1,2,3] is the first TW class pulsed power device in China. It was designed to generate 8-10 MA current with a rise time of ∼110 ns (0∼100%) into the load by Institute of Fluid Physics, CAEP. Each section contains two modules, each module consists of a Marx generator, an intermediate storage water capacitor (IS), a laser triggered gas switch (LTGS),[4,5] a pulse forming line (PFL), a water switch and a triplate output transmission line (OTL). Flexibility benefits various physics experiments carried on PTS, especially those requires specific current waveforms like ICE (isentropic compression experiments) and EOS (equation of state) experiments.[8,9]
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