First Cold Powering Test of REBCO Roebel Wound Coil for the EuCARD2 Future Magnet Development Project

Glyn A. Kirby , Jeroen van Nugteren , H. Bajas , V. Benda , A. Ballarino , M. Bajko , Luca Bottura , K. Broekens , M. Canale , A. Chiuchiolo , L. Gentini , N. Peray , Juan Carlos Perez , Gijs de Rijk , Adriaan Rijllart , Lucio Rossi , J. Murtomaeki , Jacky Mazet , Francois-Olivier Pincot , Giovanni Volpini , Maria Durante (1) , P. Fazilleau (1) , Clement Lorin (1) , A. Stenvall , Wilfried Goldacker , Anna Kario , Alexander Usoskin

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives

EuCARD-2 is a project partly supported by FP7-European Commission aiming at exploring accelerator magnet technology for 20 T dipole operating field. The EuCARD-2 collaboration is liaising with similar programs for high field magnets in the USA and Japan. EuCARD-2 focuses, through the work-package 10 “Future magnets,” on the development of a 10 kA-class superconducting, high current density cable suitable for accelerator magnets, for a 5 T stand-alone dipole of 40 mm bore and about 1 m length. After standalone testing, the magnet will possibly be inserted in a large bore background dipole, to be tested at a peak field up to 18 T. This paper starts by reporting on a few of the highlight simulations that demonstrate the progress made in predicting: dynamic current distribution and influence on field quality, complex quench propagation between tapes, and minimum quench energy in the multitape cable. The multiphysics output importantly helps predicting quench signals and guides the development of the novel early detection systems. Knowing current position within individual tapes of each cable we present stress distribution throughout the coils. We report on the development of the mechanical component and assembly processes selected for Feather-M2 the 5 T EuCARD2 magnet. We describe the CERN variable temperature flowing helium cold gas test system. We describe the parallel integration of the FPGA early quench detection system, using pickup coils and temperature sensors, alongside the standard CERN magnet quench detection system using voltage taps. Finally we report on the first cold tests of the REBCO 10 kA class Roebel subscale coil named Feather-M0.

Mots clés: Superconducting magnets; accelerators magnets; high-temperature-superconductors; EuCARD-2; future magnets; HTS; Roebel cable; cryogenic systems; metal 3-D printing; coil; accelerator: magnet; magnet: technology; superconductivity; magnet: quenching; cryogenics; FPGA; dipole; magnetic field; current: density; current: high; helium; CERN Lab

Domaines: Physique des accélérateurs [physics.acc-ph]

Glyn A. Kirby, Jeroen van Nugteren, H. Bajas, V. Benda, A. Ballarino, et al.. First Cold Powering Test of REBCO Roebel Wound Coil for the EuCARD2 Future Magnet Development Project. Applied Superconductivity Conference, Sep 2016, Denver, United States. pp.4003307, ⟨10.1109/TASC.2017.2653204⟩. ⟨hal-01584625⟩