Field operation and cooling test of high Tc coil made of Bi-based pancake coil were carried out. By the measurement of critical current distribution inside the high Tc coil, we found that the critical current of the edge pancake coil is lower than that of the center pancake coil. This result is explained quantitatively in consideration of field and field angle dependence of critical current for the tape-shaped conductor and field distribution inside the coil. Magnet system assembled GM-refrigerator, high Tc current lead and the high Tc coil was tested. As a result, it was found that thermal load into the coil was low and field operation up to 90% of critical current of the high Tc coil was stable.
