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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Two dimensional density and its fluctuation measurements by using phase imaging method in GAMMA 10.

M Yoshikawa¹, S Negishi, Y Shima

¹Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan. yosikawa@prc.tsukuba.ac.jp

The Review of Scientific Instruments

|November 2, 2010

Summary

A new 2D interferometer system was developed to analyze plasma confinement in fusion devices. This system successfully measured 2D electron density and fluctuation profiles, showing dependence on confining potential formation.

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Area of Science:

Plasma physics
Fusion energy research
Magnetic confinement fusion

Background:

Improving plasma confinement is crucial for achieving controlled nuclear fusion.
Understanding plasma density distribution and fluctuations is key to optimizing confinement.
Previous methods lacked the resolution to capture 2D plasma dynamics effectively.

Purpose of the Study:

To develop and implement a 2D interferometer system for detailed plasma analysis.
To investigate the 2D electron density and fluctuation profiles in the GAMMA 10 tandem mirror.
To correlate plasma profiles with axial confining potential formation.

Main Methods:

Construction of a 2D interferometer system utilizing phase imaging.
Application of the system to the GAMMA 10 tandem mirror device.
Measurement and analysis of 2D electron density and fluctuation profiles.

Main Results:

Successfully obtained 2D electron density and fluctuation profiles.
Demonstrated the system's capability to study plasma dynamics in detail.
Observed a clear dependence of plasma profiles on axial confining potential.

Conclusions:

The developed 2D phase imaging interferometer is effective for analyzing plasma confinement.
Axial confining potential formation significantly influences 2D plasma density and fluctuation profiles.
This technology aids in optimizing plasma confinement strategies for fusion energy.