Division of accelerators, cryogenics and magnetism

Important: the slides for this seminar are available for download, since it contains non-published material you are asked to keep distibution and access within CEA only

Abstract

It is two decades ago since an Nb₃Sn dipole magnet broke through the 10.5 T record that was set by Nb-Ti dipoles, and one decade ago since the last Nb₃Sn dipole magnetic field record was set at 16 T.  In my talk, I will show how the progress from 10.5 T to 16 T in Nb₃Sn dipoles was, next to advances in magnet fabrication technology, to a large extend enabled by advances in conductor technology.  I will also explain why the progress in achievable magnetic field using LTS dipoles has halted 10 years ago, and why radical changes in magnet fabrication philosophy and superconducting material are needed to progress further.  A string of breakthroughs over the last two years, both in conceptual magnet design as well as in achieved HTS conductor performance, suggests that we are presently at the dawn of a new era in very high field magnet technology.  Concluding my talk, I will demonstrate that it seems very likely that hybrid magnets, constructed from Nb₃Sn outer and Bi‑2212 inner windings and approaching 20 T dipole fields, are realistic and on a near horizon.

Bio

Arno Godeke was educated in Mechanical Engineering, Physics Engineering, and Applied Physics in the Netherlands and the USA.  He has broad multidisciplinary experience in mechanical, electrical, and cryogenic design, fabrication, and implementation; and in the materials science, large-scale application and physics of superconductors.  He has worked in superconductivity in various positions at the University of Twente, The Netherlands, from 1992 through 2005. In 1998, he visited the NHMFL, Tallahassee, FL, USA, on a sabbatical, and worked at the University of Wisconsin, Madison, WI, USA, from 2002 to 2003 to obtain his PhD in Applied Physics from Twente in 2005.  Since 2006, Dr. Godeke is at Lawrence Berkeley National Laboratory, Berkeley, CA, USA, where he is responsible for the conductor support for LBNL’s high-field magnets and LARP, the development of new high-field conductor and magnet technologies, and fundamental research through the education of young talent.