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- M. Pezzetta, G. Bazzano, E. Bressi, L. Falbo, C. Priano, M. Pullia
CNAO Foundation, Milan, Italy
- O. Coiro, G. Franzini, D. Pellegrini, M. Serio, A. Stella
INFN/LNF, Frascati (Roma), Italy
- G. Venchi
University of Pavia, Pavia, Italy
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The commissioning of CNAO, the Italian Centre of Oncological Hadrontherapy, with proton beams is completed. The real-time measurement of the synchrotron dipole field with the so-called B-train, together with its electronic systems and related software and firmware are here described. An additional magnet, powered in series with the synchrotron dipoles, is equipped with a special coil that measures the field integral variation along the beam nominal path. The voltage induced in the coil is digitized with a fast ADC and numerically integrated by an FPGA. The field integral is then distributed to the users every time that the equivalent field changes by 0.1 G. The measured B field ranges from 0 to 1.6 T with maximum ramps of 3 T/s. The B-train system will be used to provide feedback in field to the dipole power supply. It will handle the limited bandwidth of the active filter, the B-field lag in the magnets and will avoid current jumps.
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