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A compact flexible pellet injector for the TJ-II stellarator.

K J McCarthy¹, S K Combs, L R Baylor

¹Laboratory Nacional de Fusion, CIEMAT, Av. Complutense 22, 28040 Madrid, Spain.

The Review of Scientific Instruments

|December 3, 2008

Summary

A new compact pellet injector for the TJ-II stellarator offers flexible fueling and diagnostics. This upgraded system enables precise control over hydrogen pellet size and velocity for plasma experiments.

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Area of Science:

Fusion Energy Research
Plasma Physics
Accelerator Technology

Background:

The TJ-II stellarator requires advanced fueling and diagnostic capabilities.
Existing pellet injector technology has limitations in flexibility and cost-effectiveness.

Purpose of the Study:

To design and build a compact, cost-effective, and upgradeable pellet injector for the TJ-II stellarator.
To enable flexible fabrication and acceleration of hydrogen pellets for plasma fueling and active diagnostics.

Main Methods:

Development of a four-barrel pellet injection system.
Integration of a cryogenic refrigerator for in situ hydrogen pellet formation.
Implementation of a combined mechanical punch/propellant valve system for pellet acceleration.
Inclusion of pellet diagnostics and a dedicated injection line.

Main Results:

The injector is designed for maximum flexibility at minimal cost.
It allows for fabrication of pellets with diameters from 0.4 to 1 mm.
Pellet acceleration velocities will range from 150 to approximately 1000 m/s.

Conclusions:

The new pellet injector will enhance the TJ-II stellarator's capabilities for plasma fueling and diagnostics.
The flexible design ensures adaptability for future upgrades and diverse experimental needs.
This system represents a significant advancement in compact pellet injection technology for fusion research.