  Development of REBCO cables that carry high electrical current in high
magnetic field is crucial for future large-scale magnet applications. This
experimental work presents the critical current measurements of two different
REBCO cables by a test facility at the National High Magnetic Field Laboratory
(NHMFL). The simple-stacked cable is made by the NHMFL by stacking 21 REBCO
tapes without soldering. The Conductor-on-Round-Core (CORC) cable provided by
Advanced Conductor Technologies has 21 layers of REBCO tapes with 2
tapes/layer. The test facility consists of a 12 T split solenoid magnet with 15
cm bore providing transverse field to the samples, a superconducting
transformer (SCT) as a current source providing up to 45 kA current. Special
attentions were paid to fabrication of solder joints between REBCO cables and
the SCT output. The voltage-current traces were measured as a function of
magnetic field at 4.2 K, from which the critical currents are determined. The
details of this measurement are discussed.
