Speaker
Description
Neutral beam injection (NBI) is one of the most important auxiliary heating and current drive methods for future fusion devices. In negative ion-based neutral beam injection (NNBI) systems, understanding beam power deposition and neutralization characteristics is essential for improving beam transmission efficiency and ensuring reliable long-pulse operation. In this work, a high-power neutral beam experiment is carried out in the CRAFT NNBI test facility to investigate the power deposition characteristics and neutralization efficiency under electrostatic deflection conditions. Thermocouple measurements, Water Flow Calorimetry (WFC) and Secondary Electron Detector (SED) are employed to measure the transient thermal response and beam power deposition on beamline components, including the neutralizer, electrostatic residual ion dump (ERID), and calorimeter. The relationships between beam transmission, residual ion power deposition, thermal loading distribution, and neutralization efficiency are systematically analyzed by varying the neutralizer pressure. The experimental results have been used to evaluate the operational stability and engineering reliability of the electrostatic deflection system. This work is expected to provide important experimental data and technical support for beam power deposition analysis, neutralization efficiency evaluation, and residual ion control in future high-power neutral beam injection systems for fusion applications.
| Email address | xufengpeng@ie.ah.cn |
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| Visitor's Visa | yes |
| Classification | H- and D- sources for fusion, accelerators and other applications |