Current distribution measurement on the ITER-type NbTi Bus Bar III

R. Zanino, M. Bagnasco, F. Bellina, T. Bonicelli, A. Della Corte, A. Di Zenobio, W.H. Fietz, A. Formisano, R. Heller, Yu. Ilyin, V. Marchese, R. Martone, L. Muzzi, A. Nijhuis, M. Polak, P.L. Ribani, E. Salpietro, L. Savoldi Richard, S. Turtu, L. VerdiniG.R. Zahn

Research output: Contribution to journalArticle

13 Citations (Scopus)


The Bus Bar III (BBIII), fabricated within the Toroidal Field Model Coil Task of the International Thermonuclear Experimental Reactor (ITER), was tested at the Forschungszentrum Karlsruhe, Germany, in the spring of 2004. The BBIII consists of an approximately 7 m long NbTi dual-channel conductor with a thick square stainless steel jacket, cooled by forced flow supercritical He. It was energized with currents up to 80 kA and operates in its self magnetic field (up to ∼0.8 T). The BBIII was instrumented with Hall-probe heads and arrays, voltage rings and longitudinal voltage taps for electro-magnetic measurements, in order to get experimental data to be used for the validation of a recently developed hybrid thermal-hydraulic electro-magnetic code (THELMA), as well as for the assessment of the possibility of performing a reliable reconstruction of the current distribution in the conductor cross section under controlled conditions. In the tests, current ramps at different rates were applied to characterize the conductor time constants, while two different resistive heaters (one upstream of the BBIII inlet, another one directly on the BBIII jacket) were separately operated in order to approach current sharing in the conductor and to observe the related current re-distribution. In this paper, a summary of the collected experimental results is presented, with particular emphasis on those aspects more relevant for the forthcoming THELMA analysis. © 2005 IEEE.
Original languageEnglish
Pages (from-to)1407 - 1410
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 PART II
Publication statusPublished - 1 Jun 2005
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Zanino, R., Bagnasco, M., Bellina, F., Bonicelli, T., Della Corte, A., Di Zenobio, A., ... Zahn, G. R. (2005). Current distribution measurement on the ITER-type NbTi Bus Bar III. IEEE Transactions on Applied Superconductivity, 15(2 PART II), 1407 - 1410.