Status of the ITER neutral beam injection system
R S Hemsworth1, A Tanga, V Antoni
1ITER, ITER Joint Work Site, CEA Cadarache, St Paul lez Durance Cedex, France.
The Review of Scientific Instruments
|March 5, 2008
Summary
ITER
Area of Science:
- Fusion energy research
- Plasma physics
- Particle accelerator technology
Background:
- ITER neutral beam injectors are designed for fusion reactor conditions.
- They must operate in a radioactive environment with high neutron flux.
- Previous designs required significant modifications for maintainability and safety.
Purpose of the Study:
- To detail the design and recent modifications of ITER's neutral beam injectors.
- To introduce the Neutral Beam Test Facility (NBTF) for testing these injectors.
- To outline the development and testing strategy for the ion source and complete injector systems.
Main Methods:
- Design modifications include a rectangular vacuum vessel, all-metal valve, RF-driven ion source, and air-insulated HV deck.
- Development of a Neutral Beam Test Facility (NBTF) in Padua, Italy.
- NBTF will feature two test beds for full-performance injector and ion source testing.
Main Results:
- The injectors are designed to produce 40 A D(-) 1 MeV beams for up to 3600 s pulses.
- A novel gas neutralizer design with four channels minimizes gas flow.
- Recent design updates enhance maintainability and operational safety in a radiation environment.
Conclusions:
- The ITER neutral beam injectors represent a significant advancement in fusion technology.
- The NBTF will be crucial for validating the performance and reliability of these injectors.
- Successful operation of these injectors is vital for achieving fusion power generation.
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