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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

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Published on: July 2, 2012

One-dimensional model of a plasma-electrode optical switch driven by one-pulse process.

Xiaojun Zhou, Guo Wenqiong, Zhang Xiongjun

|June 12, 2009

Summary

This study introduces a simplified model for Plasma-Electrode Pockels Cells (PEPCs), crucial optical switches in fusion energy research. The model simulates gaseous discharge and KDP crystal charging, aiding PEPC design and performance prediction.

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Area of Science:

Plasma physics
Optical engineering
Materials science

Background:

Plasma-Electrode Pockels Cells (PEPCs) are vital large-aperture optical switches for inertial-confinement fusion laser drivers.
PEPCs utilize high discharge currents to create plasma electrodes and apply high voltage pulses across KDP crystal plates.

Purpose of the Study:

To develop a one-dimensional simplified model for simulating gaseous discharge and KDP crystal surface charging in PEPCs.
To analyze the behavior of discharge current, KDP crystal charging voltage, and switch efficiency during a one-pulse process.

Main Methods:

A one-dimensional simplified model was developed to simulate the physical processes within a PEPC.
The model focuses on gaseous discharge and the charging dynamics of the KDP crystal surface.
Simulations were performed for a single-pulse operational scenario.

Main Results:

The study presents simulated results for the evolution of discharge current and KDP crystal charging voltage.
Simulated switch efficiency of the PEPC was analyzed.
The model successfully captures the key processes occurring during PEPC operation.

Conclusions:

The developed one-dimensional model provides valuable insights into PEPC operational dynamics.
This model is highly useful for optimizing PEPC design and predicting optical switch performance.
The findings contribute to the advancement of optical switching technology for fusion applications.