Commissioning experience with the largest superconducting cyclotron, the NSCL K800

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Abstract

The largest of the superconducting cyclotrons, the NSCL K800, was commissioned during the summer of 1988. The first internal beam was accelerated to the extraction radius of 1 m on February 22, 1988, and then, after installation of the extraction elements, the first ion beam was extracted on June 6. This cyclotron is based on a 280 ton superconducting magnet with a magnetic field operating-range of 3–5 T and a maximum magnetic rigidity of 5 Tm (K = 1200). Typical maximum design energies are E/A = 200 MeV for fully stripped N = Z ions and E/A = 48 MeV for = 26 129Xe ions. An ECR ion source and axial injection system has been used with this cyclotron from the beginning. A major initial success in the commissioning is the excellent agreement between the computer calculations and the actual beam trajectories in the intricate extraction system. Initial experience with all major subsystems is discussed: magnetic field data, superconducting magnet, cryogenics, three-phase rf system, ECR ion source/axial injection and electric/magnetic extraction elements.

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