The ITER Neutral Beam Test Facility (PRIMA - Padova Research on Injector Megavolt Accelerated) is planned to be built at Consorzio RFX (Padova, Italy). PRIMA includes two experimental devices: a full size plasma source with low voltage extraction called SPIDER (Source for Production of Ion of Deuterium Extracted from Rf plasma) and a full size neutral beam injector at full beam power called MITICA (Megavolt ITER Injector Concept Advancement) [1]. The beam source components are exposed to high and focused heat loads during beam production and, being at high voltage, they are actively cooled by ultra-pure water which flows through cooling channels machined inside the components. The high and very localised power densities, the complexity of the cooling circuits and their small, rectangular cross sections are design critical issues. A series of different types of Single cooling Channel Prototypes (SCPs) for the SPIDER accelerator grids have been manufactured [2] and their performances in terms of mechanical reliability and heat removal capability have been tested in environmental conditions similar to injector ones. In fact, the SCPs have been subjected to thermal loads up to the average heat power density of 1 MW/m2, in vacuum environment (<0.5 Pa). The experimental results have been cross-checked with Computational Fluid Dynamics (CFD) analyses in order to set up a reliable model to simulate all the complex geometries of NBI actively cooled components. This paper presents the results of the tests carried out on the SPIDER SCPs, with a particular focus on comparison with the results coming from CFD analyses and analytical models for pressure drop and heat exchange calculation. [1] P. Sonato, et al., The ITER full size plasma source device design, Fusion Engineering and Design, Volume 84, Issues 2-6, June 2009 [2] F. Fantini, P. Agostinetti, V. Cervaro, S. Dal Bello, M. Maniero, N. Pomaro, A. Rizzolo, L. Trevisan, P. Zaccaria, "Realization of a first series of Single Channel Prototypes for the SPIDER grids", presented at the SOFT 26 conference, article accepted for publishing in Fus. Eng. Des.
Thermo-Fluid Dynamics Tests on the Single Channel Prototypes for the Spider Grids
Agostinetti P;Maniero M;Zaccaria P
2011
Abstract
The ITER Neutral Beam Test Facility (PRIMA - Padova Research on Injector Megavolt Accelerated) is planned to be built at Consorzio RFX (Padova, Italy). PRIMA includes two experimental devices: a full size plasma source with low voltage extraction called SPIDER (Source for Production of Ion of Deuterium Extracted from Rf plasma) and a full size neutral beam injector at full beam power called MITICA (Megavolt ITER Injector Concept Advancement) [1]. The beam source components are exposed to high and focused heat loads during beam production and, being at high voltage, they are actively cooled by ultra-pure water which flows through cooling channels machined inside the components. The high and very localised power densities, the complexity of the cooling circuits and their small, rectangular cross sections are design critical issues. A series of different types of Single cooling Channel Prototypes (SCPs) for the SPIDER accelerator grids have been manufactured [2] and their performances in terms of mechanical reliability and heat removal capability have been tested in environmental conditions similar to injector ones. In fact, the SCPs have been subjected to thermal loads up to the average heat power density of 1 MW/m2, in vacuum environment (<0.5 Pa). The experimental results have been cross-checked with Computational Fluid Dynamics (CFD) analyses in order to set up a reliable model to simulate all the complex geometries of NBI actively cooled components. This paper presents the results of the tests carried out on the SPIDER SCPs, with a particular focus on comparison with the results coming from CFD analyses and analytical models for pressure drop and heat exchange calculation. [1] P. Sonato, et al., The ITER full size plasma source device design, Fusion Engineering and Design, Volume 84, Issues 2-6, June 2009 [2] F. Fantini, P. Agostinetti, V. Cervaro, S. Dal Bello, M. Maniero, N. Pomaro, A. Rizzolo, L. Trevisan, P. Zaccaria, "Realization of a first series of Single Channel Prototypes for the SPIDER grids", presented at the SOFT 26 conference, article accepted for publishing in Fus. Eng. Des.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
