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Compact, reliable and little consuming accelerators are required for thetreatment of tumours with ions. TERA proposes the "cyclinac", composed of ahigh-frequency, fast-cycling linac which boosts the energy of the particlespreviously accelerated in a cyclotron. The dimensions of the linac can bereduced if high gradients are used. TERA initiated a high-gradient test programto understand the operational limit of such structures. The program foreseesthe design, prototyping and high-power test of several high-gradient structuresoperating at 3 and 5.7 GHz. The high-power tests of the 3 GHz single-cellcavity were completed in Winter 2012. The maximum BDR threshold measured forEmax of 170 MV/m and RF pulses of 2.5 \mu s was 3 x 10-6 bpp/m.

High-power test results of a 3 GHz single-cell cavity