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Multi-slit triode ion optical system with ballistic beam focusing.

V Davydenko¹, V Amirov¹, A Gorbovsky¹

¹Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.

The Review of Scientific Instruments

|March 3, 2016

Summary

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Researchers developed advanced triode ion-optical systems for intense neutral beams crucial for plasma heating. These systems successfully generated high-energy proton and deuterium beams for fusion research applications.

Area of Science:

Plasma Physics
Fusion Energy
Ion Optics

Background:

Intense focused neutral beams are essential for efficient plasma heating in fusion devices.
Multi-slit triode ion-optical systems with spherical electrodes offer a promising approach for generating such beams.
Existing systems require optimization for advanced fusion applications like Tokamak Configuration Variable (TCV).

Purpose of the Study:

To develop and characterize multi-slit triode ion-optical systems for generating intense focused neutral beams.
To evaluate the performance of these systems in forming proton and deuterium beams for plasma heating.
To adapt and optimize ion optical systems for specific fusion devices, such as the TCV.

Main Methods:

Design and fabrication of two distinct multi-slit triode ion-optical systems with spherical electrodes.

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Experimental generation and analysis of proton beams (15 keV, 140 A, 30 ms).

Development and testing of a system for the TCV, producing deuterium beams (35 keV, 1 MW, 2 s).

Main Results:

The first system successfully formed a 15 keV proton beam with 140 A current and 30 ms duration.
The second system, designed for TCV, generated a focused deuterium neutral beam with 35 keV energy, 1 MW power, and 2 s duration.
The deuterium beam exhibited low angular divergence: 20-22 mrad across slits and 12 mrad along slits.

Conclusions:

Multi-slit triode ion-optical systems are effective for producing intense, focused neutral beams for plasma heating.
The developed systems demonstrate capability for high-energy, high-power neutral beam injection in fusion research.
Optimized ion optics are critical for achieving desired beam characteristics and efficient plasma heating in devices like TCV.