B-train Performances at CNAO
Sep, 2011
3 pages
Published in:
- Conf.Proc.C 110904 (2011) 568-570
Contribution to:
Report number:
- IPAC-2011-MOPO039
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Abstract:
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 digi tized 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 sy stem 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.- p: beam
- synchrotron
- magnetic field: spatial distribution
- analog-to-digital converter
- programming
- performance
- FPGA
- measurement methods
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