Speaker
Description
The Comprehensive Research Facility for Fusion Technology (CRAFT) is dedicated to developing core key technologies for future fusion reactors, which incorporates a Negative Ion Source Neutral Beam Injection (NNBI) test facility. The CRAFT NNBI test facility consists of two core test stands: the Hefei Open-facility for Negative-ion Source Research (HONOR), which focuses on experimental investigations of negative ion source characteristics, and the CFETR Advance Neutral Beam Equipment (CANBE), which serves as the prototype neutral beam injector for the Chinese Fusion Engineering Test Reactor (CFETR). To support the R&D on key NNBI technologies, radio-frequency negative ion sources with dual-driver and quad-driver configurations have been independently developed.
Currently, the third experimental campaign of the CRAFT NNBI test facility is in progress, targeting the realization of high-power and long-pulse pure neutral beam on the CANBE test stand. Through systematic optimizations of ion source structure, facility operating performance and experimental operation techniques, the facility has achieved stable high-performance negative ion beam accelerations during the long-term operation (guaranteed ion beam parameters: >180 keV, >2 MW, >200 A/m2, 20~100s). Given that most core components have been in continuous service for more than three years, the negative ion sources were fully disassembled and inspected, with no operational faults detected, verifying the reliable service performance of the device.
On the basis of the above technical breakthroughs, a megawatt-level pure neutral beam was successfully generated for the first time by adopting the residual ion electrical deflection purification technique. Nevertheless, over-current breakdown events occurring on the residual ion dump restrict the continuous and stable purification of neutral beams, which remains a key technical problem to be solved in subsequent research. This paper will elaborate on the latest technical progress, key parameter verification results and existing technical bottlenecks of the CRAFT NNBI facility, providing a reference for the engineering development and performance optimization of high-power long-pulse neutral beam injection systems for fusion reactors.
| Visitor's Visa | yes |
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| Classification | Status of facilities |