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Updated: Jun 27, 2026
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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Measurement of heating laser injection time to imploded core plasma by using x-ray framing camera
Mayuko Koga1, Takashi Fujiwara, Tatsuhiro Sakaiya
1Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan. koga-m@ile.osaka-u.ac.jp
The Review of Scientific Instruments
|December 3, 2008
Summary
This study demonstrates using an x-ray framing camera (XFC) to precisely measure heating laser injection timing during plasma implosion experiments. The XFC provides a 10-picosecond resolution for timing, crucial for fusion energy research.
Area of Science:
- Plasma Physics
- Laser-Inertial Fusion
Background:
- Accurate measurement of laser injection timing is critical for controlled plasma implosions.
- Existing methods may lack the necessary temporal resolution for precise diagnostics.
Purpose of the Study:
- To develop and validate a method for simultaneous measurement of imploded core plasma and heating laser injection time.
- To assess the temporal resolution achievable with an x-ray framing camera (XFC) for laser timing.
Main Methods:
- Simultaneous plasma and laser timing measurements using an XFC.
- Experiments conducted on the Gekko XII and Peta Watt (PW) laser systems.
- Analysis of x-ray intensity profiles and comparison with x-ray streak camera data.
Main Results:
- X-ray intensity profiles from the XFC fit Gaussian distributions.
- The microchannel plate dynode model qualitatively explains broadened temporal profiles.
- XFC measurements show good agreement with streak camera data for high-energy x-rays.
- Peak position shifts correlate with delayed PW laser injection times.
Conclusions:
- The XFC can effectively measure heating laser injection time.
- A temporal resolution of approximately 10 picoseconds is achievable using the XFC for laser timing.
