Add a field of type Solenoid to the fields of the compact description.

<fields>
  <field type="Solenoid" name="GlobalSolenoid"
         inner_field="5.0"
         outer_field="-0.6"
         zmax="1000"
         outer_radius="144*cm+(2+1)*34*cm"/>
</fields>

The inner_field is applied to radii with the outer_radius while the the outer_field is applied to radii outside this distance.

The zmax attribute specifies an absolute z value after which the field is no longer applied. (There is no "fall off" implemented.)

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