Speakers
Description
The Comprehensive Research Facility for Fusion Technology (CRAFT) is a large scientific device that is preferentially deployed for the construction of major national science and technology infrastructures. A negative beam source based neutral beam injector (NNBI) with beam energy of 400 keV, beam power of 2 MW and beam duration of 100 s is one of the device. A radio frequency (RF) based negative beam source was designed for the CRAFT NNBI system. In order to understand the physics and pre-study the engineering problems for RF negative beam source, a prototype source with single driver was developed. Recently, this beam source was tested on the RF source test facility with RF plasma generation, negative ion production and extraction. The long pulse of 105 seconds negative ion beam was extracted successfully from a three electrons accelerator. The extracted ion current is 153 A/m2 with Cs injection and the ratio of electron and negative ion is around 0.3. It lays good foundation for the R&D of negative ion source for CRAFT NNBI system. The details of design and experimental results of beam source was shown in this paper.
