Negative ion-based neutral beam injector
First Claim
1. A negative ion-based neutral beam injector comprisesan ion source adapted to produce a negative ion beam,an accelerator, wherein the accelerator includes a pre-accelerator and a high energy accelerator, wherein the pre-accelerator is an electrostatic multi aperture grid in the ion source, and wherein the high energy accelerator is spaced apart from the ion source, anda neutralizer, wherein the ion source, accelerator and neutralizer produce a neutral beam with power of 5 MW.
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Abstract
A negative ion-based neutral beam injector comprising a negative ion source, accelerator and neutralizer to produce about a 5 MW neutral beam with energy of about 0.50 to 1.0 MeV. The ions produced by the ion source are pre-accelerated before injection into a high energy accelerator by an electrostatic multi-aperture grid pre-accelerator, which is used to extract ion beams from the plasma and accelerate to some fraction of the required beam energy. The beam from the ion source passes through a pair of deflecting magnets, which enable the beam to shift off axis before entering the high energy accelerator. After acceleration to full energy, the beam enters the neutralizer where it is partially converted into a neutral beam. The remaining ion species are separated by a magnet and directed into electrostatic energy converters. The neutral beam passes through a gate valve and enters a plasma chamber.
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Citations
24 Claims
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1. A negative ion-based neutral beam injector comprises
an ion source adapted to produce a negative ion beam, an accelerator, wherein the accelerator includes a pre-accelerator and a high energy accelerator, wherein the pre-accelerator is an electrostatic multi aperture grid in the ion source, and wherein the high energy accelerator is spaced apart from the ion source, and a neutralizer, wherein the ion source, accelerator and neutralizer produce a neutral beam with power of 5 MW.
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23. A negative ion-based neutral beam injector comprises
an ion source adapted to produce a negative ion beam, an accelerator, wherein the accelerator includes a pre-accelerator and a high energy accelerator, wherein the pre-accelerator is in the ion source and the high energy accelerator is spaced apart from the ion source, and a neutralizer coupled to the ion source.
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24. A negative ion-based neutral beam injector comprises
an ion source adapted to produce a negative ion beam, wherein the ion source includes a plasma box and plasma drivers, and wherein internal walls of the plasma box and plasma drivers are maintainable at elevated temperatures of 150-200° - C. to prevent cesium accumulation on their surfaces,
an accelerator operably coupled to the ion source, and a neutralizer operably coupled to the ion source.
- C. to prevent cesium accumulation on their surfaces,
Specification