Three-stage superconducting XRAM generator

Philipp Dedié, Volker Brommer, Arnaud Badel, Pascal Tixador

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


XRAM generators can be used for powering pulse loads demanding peak power ratings up to the gigawatt range, such as magneto-forming devices, ETC (electrothermal-chemical) guns, high-power microwaves, and railguns. They are a valid alternative to power capacitors being currently at the limits of their technology. In order to improve the XRAM generator in terms of efficiency, the German-French Research Institute of St. Louis (ISL) investigated in cooperation with the G2Elab the use of high-temperature superconducting coils for an XRAM generator. Moreover, as the XRAM switching principle can be integrated into a superconducting magnetic energy storage (SMES) system, a superconducting XRAM generator has the ability to hold its energy available on demand for a longer time than currently employed high-density power capacitors. Our three-stage superconducting XRAM test case reached a maximum charging current of 200 A, discharging a magnetic energy of 84 kJ at 600 A peak current into a 27 mΩ load during a 34 s long discharge. This is the first report in the literature on successful experiments with a superconducting XRAM generator.

Original languageEnglish
Article number5976114
Pages (from-to)1189-1193
Number of pages5
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number4
Publication statusPublished - 2011 Aug
Externally publishedYes


  • SMES
  • XRAM generator
  • countercurrent commutation
  • current multiplication
  • inductive storage
  • opening switch
  • superconducting

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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