Evaluation of different cooling fluids for high-voltage neutral beam injector grids

Piero Agostinetti, Marco Boldrin, Francesca Fantini

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

The Neutral Beam Injectors (NBIs) of the ITER experimental fusion reactor are designed to accelerate Deuterium negative ions with energy up to 1 MeV and current up to 40 A. The accelerator grids must be designed to operate at high voltages and to withstand high power densities (in the order of some tens of MW m ).2They must maintain a proper alignment in all the foreseen operating scenarios, in order to obtain good beam optics, so the thermo-mechanical deformations must be maintained at very low values. Further requirements come from the need of keeping under control the maximum surface temperature in copper.With these requirements, the cooling of the grids represents a significantly critical aspect of the NBI design. Coolant properties have to satisfy high resistivity requirements and to be appropriate for the removal of high heat loads. The cooling circuits must match with the beam optic geometry and the space constrains severely affect the coolant distribution.This paper presents some studies of the grid cooling circuits design carried out with Computational Fluid Dynamics (CFD) numerical simulations and analytical methods. Cooling performances for different cooling fluids (water and dielectric coolants) have been investigated. Copyright © 2008 IEEE.
Original languageEnglish
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event2008 2nd International Conference on Thermal Issues in Emerging Technologies, ThETA 2008 - , Egypt
Duration: 1 Jan 2008 → …

Conference

Conference2008 2nd International Conference on Thermal Issues in Emerging Technologies, ThETA 2008
CountryEgypt
Period1/1/08 → …

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Agostinetti, P., Boldrin, M., & Fantini, F. (2008). Evaluation of different cooling fluids for high-voltage neutral beam injector grids. Paper presented at 2008 2nd International Conference on Thermal Issues in Emerging Technologies, ThETA 2008, Egypt. https://doi.org/10.1109/THETA.2008.5167159