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Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

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Optimization of current waveform tailoring for magnetically driven isentropic compression experiments.

E M Waisman¹, D B Reisman¹, B S Stoltzfus¹

¹Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.

The Review of Scientific Instruments

|July 3, 2016

Summary

This summary is machine-generated.

The Thor pulsed power generator uses a novel current-adder architecture for precise pulse tailoring in material science experiments. This method optimizes current pulses without complex circuit modeling, enabling advanced equation of state studies.

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Area of Science:

High-energy physics
Pulsed power systems
Materials science

Background:

The Thor pulsed power generator at Sandia National Laboratories utilizes 288 capacitor-switch units ("bricks").
These units are designed for tailored pulse generation in magnetically driven isentropic compression experiments (ICE).
Efficient energy delivery to ICE strip-line loads achieves peak pressures exceeding 100 GPa.

Purpose of the Study:

To present an optimization process for generating tailored current pulses on the Thor generator.
To enable precise material studies, including equation of state, strength, and phase transitions.
To leverage Thor's unique "current-adder" architecture for efficient pulse shaping.

Main Methods:

Utilizing magnetohydrodynamic simulations to determine material-dependent pressure and required current/voltage.
Employing a "current-adder" approach where individual brick pulses sum to the desired output.
Optimizing brick delay times by minimizing the L2 norm between summed and target currents.

Main Results:

Demonstrated a novel optimization technique for tailored current pulses on the Thor generator.
Showcased the independence of brick forward-going pulses due to transit-time isolation.
Successfully applied the method to various materials of interest for equation of state research.

Conclusions:

The developed optimization process effectively produces tailored current pulses for material studies on the Thor generator.
Thor's architecture allows for pulse shaping without iterative circuit modeling.
The technique facilitates advanced exploration of material properties under high pressure.