Analysis of the Limitations of the AMIT Magnet During Its Commissioning

The AMIT cyclotron was developed as a collaboration led by CIEMAT to produce a compact and efficient superconducting cyclotron for radioisotope production. The magnet and its closed loop cryogenic system, based on Helium cooled by means of just one remotely located cryocooler, was manufactured. During the commissioning there was an accident at the first ramp up and the magnet supporting system was damaged. The alignment system of the coils was not able to properly position the coils inside the iron yoke, so finally it was decided to dismantle the whole cryostat to check the actual state of the inner parts. This paper describes the issues found during the commissioning of the AMIT cyclotron magnet and its cryogenic system, the partial solutions implemented and the final aperture of the cryostat. The conclusions are focused on the lessons learnt for manufacturing such a compact and low thermal losses superconducting magnet for radioisotope production and the recommendations for an improved and more reliable version.