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Superconducting bulk (RE)Ba$_2$Cu$_3$O$_{7-x}$ materials (RE-rare earthelements) have been successfully used to generate magnetic flux densities inexcess of 17 T. This work investigates an alternative approach by trapping fluxin stacks of second generation high temperature superconducting tape fromseveral manufacturers using field cooling and pulsed field magnetisationtechniques. Flux densities of up to 13.4 T were trapped by field cooling at ~5K between two 12 mm square stacks, an improvement of 70% over previous valueachieved in an HTS tape stack. The trapped flux approaches the record values in(RE)BCO bulks and reflects the rapid developments still being made in the HTStape performance.

A trapped field of 13.4 T in a stack of HTS tapes with 30 \mu m substrate