Some aspects of the design of the ITER NBI Active Correction and Compensation Coils

Javier Alonso, Germán Barrera, Santiago Cabrera, Esther Rincón, Luis Ríos, Alfonso Soleto, Anass El-Ouazzani, Joseph Graceffa, Darshan Shah, Marc Urbani, Gilbert Agarici

Research output: Contribution to journalArticlepeer-review


The neutral beam system for ITER consists of two heating and current drive injectors plus a diagnostic neutral beam injector. The proposed physical plant layout allows for a possible third heating injector to be installed later. For correct operation of the beam source, and to avoid deflections of the charged fraction of the beam, the magnetic field along the beam path must be very low. To minimize the stray ITER field in critical areas (ion source, acceleration grids, neutralizer, residual ion dump), a Magnetic Field Reduction System will envelop the beam vessels and the high voltage transmission lines to ion source. This whole system comprises the Passive Magnetic Shield, a set of thick steel plates, and the Active Correction and Compensation Coils, a set of coils carrying currents which depend on the tokamak stray field. This paper describes the status of the coil design, terminals and support structures, as well as a description of the calculations carried out. Most coils are suitable for removal from their final position to be replaced in case of a fault. Conclusions of the chosen design highlight the strategy for the system feasibility.

Original languageEnglish
Pages (from-to)392-395
Number of pages4
JournalFusion Engineering and Design
StatePublished - 1 Oct 2015

Bibliographical note

Funding Information:
The project F4E-2009-GRT-022 (PMS-H.CD) has been funded with support from Fusion for Energy . This publication reflects the views only of the author, and Fusion for Energy cannot be held responsible for any use which may be made of the information contained therein.

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved


  • Coil design
  • Magnetic shielding
  • Neutral beam injector


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