Bitter Solenoid magnet explained

Figure 1: Schematic cross section of a 20 tesla Bitter Magnet

Figure 1: Schematic cross section of a 20 tesla Bitter Magnet.

This magnet with a maximum field of 20 tesla (T) (this is 400.000 times the earth magnetic field) consists of two concentric electrical coils.

The coils are powerd by a 6000 kW (6MW) power supply. (20 kA, 300V)
These coils are electrically connected in series. The outer coil consists of about 128 turns, each built up from 3 or 4 copper "Bitter" plates (conceived by Francis Bitter) with insulator plates in between. (see figure 2) The inner coil has about 86 turns. (see figure 3)
The magnet is cooled by de-ionized water of about 10°C at a flow of 300 m3/h and an inlet pressure of 12bar (120 kPa)
The cooling water goes in axial direction through the small holes in the bitter plates of the coils, which line up exactly in every plate. (see figure 4)

Figure 2: Stack sample of the 20 tesla outer coil

Figure 2: Stack sample of the 20 tesla outer coil.

Figure 3: Stack sample of the 20 tesla inner coil

Figure 3: Stack sample of the 20 tesla inner coil.

Figure 4: Schematic principle of a Bitter Magnet

Figure 4: Schematic principle of a Bitter Magnet.