Tracer-Encapsulated Solid Pellet (TESPEL) injection system for the TJ-II stellarator

Area of Science:

• Fusion energy research
• Plasma physics
• Stellarator technology

Background:

• The TJ-II stellarator requires advanced diagnostic tools for plasma analysis.
• Developing new injection systems for plasma diagnostics can be time-consuming and costly.

Purpose of the Study:

• To develop and test a cost-effective tracer-encapsulated solid pellet (TESPEL) injection system for the TJ-II stellarator.
• To integrate a TESPEL injector with an existing cryogenic pellet injection system to reduce development time and expenses.

Main Methods:

• Combined a TESPEL injector from the National Institute for Fusion Science with the existing TJ-II cryogenic pellet injection system.
• Successfully injected TESPELs into the TJ-II plasma.
• Utilized normal-incidence spectroscopy and other pellet diagnostics to monitor tracer impurity behavior.

Main Results:

• Successful TESPEL injection into the TJ-II plasma was achieved.
• The integration of the TESPEL injector with the cryogenic system proved effective in reducing development time and cost.
• Pellet diagnostics confirmed the successful monitoring of tracer impurity behavior.

Conclusions:

• The combined TESPEL injection system is a viable and efficient method for plasma diagnostics in the TJ-II stellarator.
• This approach offers a cost-effective solution for developing advanced plasma diagnostic capabilities.
• Further studies can leverage this system to investigate impurity transport and plasma behavior.