Pedestal radius should be in length units

The pedestal radius used should have dimensionality of the length units
being used.

Author: DanShort12

parametric_plasma_source/plasma.py

@@ -20,7 +20,7 @@ def __init__(self,
                  ion_temperature_pedistal=6.09,
                  ion_temperature_seperatrix=0.1,
                  ion_temperature_origin=45.9,
-                 pedistal_radius=0.8,
+                 pedistal_radius=120,  # 0.8 * minor_radius
                  ion_density_peaking_factor=1,
                  ion_temperature_peaking_factor=8.06,
                  ion_temperature_beta=6.0,