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Fast ion beam-plasma interaction system
1Department of Physics, University of California, Los Angeles, California 90024, USA.
The Review of Scientific Instruments
|July 1, 1979
Summary
A new device enables studying fast ion beam and plasma interactions. Researchers observed an unstable wave in a field-free plasma when beam velocity matched target electron thermal velocity.
Area of Science:
- Plasma Physics
- Beam-Plasma Interactions
- Ion Beam Technology
Background:
- Investigating fast ion beam interactions with plasmas is crucial for fusion energy and astrophysical phenomena.
- Controlling plasma parameters independently is essential for fundamental studies.
Purpose of the Study:
- To construct and utilize a novel device for studying fast ion beam-target plasma interactions.
- To investigate plasma instabilities arising from specific beam-plasma conditions.
Main Methods:
- A device was built to generate and control hydrogen or helium ion beams (1-4 keV, 0.5-2 A) interacting with a target plasma.
- Pulsed discharges were used to create both the ion source plasma and the target plasma, allowing for independent parameter control.
- Beam neutralization was achieved using electrons from hot filaments.
Main Results:
- The device allows for separate control of beam energy and current.
- An unstable wave was observed in a field-free plasma.
- The instability occurs when the beam velocity closely matches the target electron thermal velocity (v(beam) ≈ 3.5 x 10(7) cm/s, Te = 0.5 eV).
Conclusions:
- The developed device is effective for studying beam-plasma interactions under controlled conditions.
- The observation of an unstable wave highlights a specific regime of beam-plasma instability.
- Further research can explore the characteristics and implications of this observed instability.
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