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Author Agostinetti, P. ♦ Dal Bello, S. ♦ Dalla Palma, M. ♦ Marcuzzi, D. ♦ Zaccaria, P. ♦ Nocentini, R. ♦ Froschle, M. ♦ Heinemann, B. ♦ Riedl, R.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2007
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword Thermomechanical processes ♦ Particle beams ♦ Radio frequency ♦ Ion sources ♦ Acceleration ♦ Plasma accelerators ♦ Ion accelerators ♦ Plasma sources ♦ Apertures ♦ Plasma temperature ♦ SINGAP ♦ design ♦ neutral ♦ beam ♦ injector ♦ grids
Abstract This paper focuses on the thermo-mechanical design of the ITER Neutral Beam Injector plasma, extraction and acceleration grids, considering the Radio Frequency option for the negative ion source and the SINGAP option for the accelerator. The SINGle Aperture -SINgle GAP (SINGAP) accelerator for ITER NBI foresees four grids for the extraction and acceleration of negative ions, instead of the seven grids of the Multi Aperture Multi Grid (MAMuG) reference configuration. The Radio Frequency ion source is a promising alternative to the Arc Driven one, showing very good performances in recent experiments at IPP Garching (D) and having the advantage of reduced maintenance requirements. A specific plasma grid was designed for RF source considering lower heat loads and different operational requirements. In particular the thermo-hydraulic and thermo-mechanical design aims at having all over the plasma grid a precisely controlled temperature to enhance the negative ions yield inside the caesium seeded source. Analytical and numerical (FE) thermo-mechanical analyses were also carried out for the extraction and acceleration grids. Structural verifications were accomplished according to the ITER Structural Design Criteria for In-Vessel Components. Design optimizations were performed in order to limit the misalignment of the grids within the tolerance specified by beam optics requirements (0.4 mm of maximum misalignment between corresponding apertures axes). The optimum cooling parameters under different operational scenarios were identified. The paper describes the design status of the grid system for the RF ion source and discusses in detail the numerical work carried out for thermo-mechanical and fluid dynamic behaviour.
Description Author affiliation: Consorzio RFX, Euratom-ENEA Assoc., Padova, Italy (Agostinetti, P.; Dal Bello, S.; Dalla Palma, M.; Marcuzzi, D.; Zaccaria, P.)
ISBN 9781424411931
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2007-06-17
Publisher Place USA
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 1.66 MB
Page Count 4
Starting Page 1
Ending Page 4


Source: IEEE Xplore Digital Library