Design of the dummy coil for magnet power supply

•It is necessary to confirm safety of the MPS on a dummy coil before the operating it.•We selected and designed the water cooling type dummy coil to test on the MPS's rating (12.5kA) test.•For the design of the dummy coil, we considered requirements about electrical, structural and water cooling.•We will test as the rating power after MPS upgrade and that test will do before every KSTAR campaign.