Yes, they are called Helmholtz coils, as flatulent mentioned.it is usual to have two large diameter coils of no great width
Obviously, you won't be able to generate 1T with this method, unless superconduction is involved.as many turns as is compatible withthe final DCR, operating current and operating temp of the coils
Not sure where the "per cm" comes from as if you wind 800,000 turns on a toroidal shaped former, air cored (of a suitable size) with an average path length of 1m you will get an average field of 1T internal to the toroidal, with 1 amp in the winding. Similarly if you arrange a single turn on the same toroid and get even current flow (800kA) in the one turn there will be 1T (ave) generated in the 1m path length of the toroid. Very similar results are obtained for a straight solenoid structure purely in air where the return path is so voluminous its effective length can be considered quite short. (I think the total mag path length is then approx twice the solenoid-structure length).As a numerical example, you need 800 kA/m to generate 1 T by an air coil, respectively a current of 8000 A through a coil with 1 winding per cm.