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Guidelines for LTS magnet design based on transient stability.

Author(s) : SEO K., MORITA M.

Type of article: Article

Summary

Stabilities of low critical temperature superconducting (LTS) magnets and their designs are studied and discussed. There are two contradictory necessities; those are low cost and high performance, in the other words, high magnetic field and large current density. Especially, the maximum magnetic fields of the latest high performance Nb3Sn magnets are around 20 T. Mentioned necessities result in the small stability margins. Needless to say, the superconducting magnet must produce its nominal field reliably. Therefore, maintaining adequate stability margin, the magnet design to draw out the high potential of the superconductor is required. The transient stability of the superconducting magnet is determined by the relationship between mechanical disturbance energy and stability margin. The minimum quench energy (MQE) is one of the index of stability margin and it is defined as the minimum energy to trigger quenching of a superconductor. MQE should be beyond any possible disturbance energy during the operation. It is difficult to identify the mechanical disturbance energy quantitatively. On the contrary, MQE had been evaluated precisely by means of the authors' developed resistive carbon paste heater (CPH). At the same time, we can predict MQE by numerical simulations. Because the magnet comes to quench if the mechanical disturbance exceeds the MQE, the disturbance energies are suspected to be equivalent to MQEs during the magnet-training. In this paper, the authors discuss the guidelines of LTS magnet design from the standpoint of MQE and they represent some case studies for various superconducting magnets and/or some different winding methods. [Reprinted with permission from Elsevier. Copyright, 2005].

Details

  • Original title: Guidelines for LTS magnet design based on transient stability.
  • Record ID : 2007-0493
  • Languages: English
  • Source: Cryogenics - vol. 46 - n. 5
  • Publication date: 2006/05

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