A 46 cm by 53 colour diagram, at midplane, of the superconducting cyclotron of the Tandem and Superconducting Cyclotron (TASCC) accelerator installed at CRNL for nuclear physics experiments. The cyclotron was constructed by the Accelerator Physics Branch at CRNL and then moved and installed in the TASCC facility where it acted as a “booster” for the beams injected from the MP tandem accelerator. It could accelerate a wide variety of ions and the appropriate magnetic field could be adjusted by a feature unique to this cyclotron – namely the change in position of iron rods. This was a concept borrowed from the control of neutron flux and power in CANDU reactors which is also achieved with the use of control rods.