Stability in a long length NbTi CICC

Author

Bottura, L. ; Ciotti, M. ; Gislon, P. ; Spadoni, M. ; Bellucci, P. ; Muzzi, L. ; Turtù, S. ; Catitti, A. ; Chiarelli, S. ; della Corte, A. ; Ferdinando, E. Di

Author_Institution

LHC Div., CERN, Geneva, Switzerland

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1542

Lastpage

1545

Abstract

A crucial issue for a superconducting coil in order to be safely used in the magnetic system of a fusion reactor is stability against all foreseen disturbances. To simulate the fusion machine conditions, including off-normal events, e.g. plasma disruptions, the energy deposition has to be spread over a “long length” cable in conduit conductor (CICC) and a background magnetic field is needed. We have therefore designed and built an experiment consisting of an instrumented NbTi test module inserted in a pair of co-axial pulsed copper coils. A 0.6 m diameter superconducting coil provides a background magnetic field up to 3 T. Calibration of the energy inductively coupled between the pulsed coils and the module has been obtained measuring the system temperature increase just after the pulse by means of thermometers positioned along the conductor. Stability vs. operating current I_op has been examined for different helium temperatures and different background magnetic fields. The finite element code Gandalf for the stability and quenching transients analysis in forced flow cooled superconducting coils has been run to check the matching with the experimental results

Keywords

cooling; finite element analysis; fusion reactor design; magnetic fields; niobium alloys; stability; superconducting cables; superconducting coils; superconducting magnets; titanium alloys; 0.6 m; 1500 V; 3 T; 35 m; 6.6 mF; Gandalf finite element code; NbTi; background magnetic field; co-axial pulsed copper coils; energy deposition; forced flow cooled superconducting coils; fusion machine conditions; fusion reactor; helium temperatures; inductively coupled energy; instrumented NbTi test module; long length NbTi cable-in-conductor; magnetic system; off-normal events; operating current; plasma disruptions; pulsed coils; quenching transients analysis; stability; thermometers; Conductors; Fusion reactor design; Magnetic field measurement; Niobium compounds; Plasma simulation; Plasma temperature; Pulse measurements; Stability; Superconducting coils; Titanium compounds;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920070

Filename

920070