1. Improving a negative ion accelerator for next generation of neutral beam injectors: Results of QST-Consorzio RFX collaborative experiments.
- Author
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Chitarin, G., Kojima, A., Aprile, D., Agostinetti, P., Barbisan, M., Denizeau, S., Ichikawa, M., Hiratsuka, J., Kashiwagi, M., Marconato, N., Pimazzoni, A., Sartori, E., Serianni, G., Veltri, P., and Yoshida, M.
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PLASMA beam injection heating , *ANIONS , *ION accelerators , *NEUTRAL beams , *PHENOMENOLOGICAL theory (Physics) , *MAGNETIC ions - Abstract
• Joint experimental campaigns carried out in QST lab in Naka, Ibaraki, Japan. • Full compensation of magnetic criss-cross deflection of beamlets obtained. • Non-uniform extraction assumed for interpreting the experimental results. • Numerical simulations can reproduce the experimental results with good accuracy. In the framework of the collaboration between Consorzio RFX (Padova, Italy) and QST (Naka, Japan) two experimental campaigns have been organized on the Negative Ion Test Stand (NITS) in Naka, employing an ITER-like multi-beamlet configuration. These campaigns were aimed at compensating for the undesired magnetic deflection of the ion beam. The experiments have clarified the influence of operating parameters on the optical properties of the ion beam. The physical phenomena acting on the optics have been investigated, in particular the effect of an asymmetry of the ion current density at meniscus. Comparisons with simulations have been made and the modeling has been improved consequently. During the second experimental campaign, a perfect compensation of the ion deflection has been achieved. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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