Behavior of$rm MgB_2$Reacted and Wound Coils From 14 K to 32 K in a Cryogen Free Apparatus

We studied experimentally the behavior of MgB
₂
reacted and wound pancakes, made with Columbus Superconductors' tape, at several temperatures in a cryogen free apparatus. The coils were wound with nickel sheathed, copper stabilized, multifilamentary MgB
₂
tape. The pancake coils were tested in a cryogen free test facility above 14 K. We also show the critical current measurements of MgB
₂
short samples (taken from a production of long lengths) as a function of the applied external magnetic field