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| THPP120 |
Measurements on an A/D Interface Used in the Power Supply Control System of the Main Dipoles of CNAO
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3638 |
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- G. Franzini, D. Pellegrini, M. Serio, A. Stella
INFN/LNF, Frascati (Roma)
- M. Donetti, M. Pezzetta, M. Pullia
CNAO Foundation, Milan
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The CNAO (the Italian Centre of Oncological Hadrontherapy, near Pavia) is in its final step of construction and is about to be fully operative. It is based on a synchrotron that can accelerate protons up to 250MeV and carbon ions up to 400MeV/u for the treatment of patients. In this paper we describe an A/D interface, used in the power supply control system of the synchrotron main dipoles, called B-Train. The field is measured in a dedicated dipole connected in series with the sixteen ones of the synchrotron and is then fed back to the power supply. The field is obtained integrating and digitizing the voltage induced on a pickup coil inserted in the gap of the seventeenth dipole. The A/D interface under study is based on a 64-channel current to frequency converter ASIC, in CMOS 0.35 μm technology, followed by a counter and uses a recycling integrator technique. The digital signal obtained is then used to generate a feedback signal for control system of the dipoles power supply. We present the electronic structure, the lab measurements and the behavior for various setups of the A/D interface described.
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| THPP122 |
Fast High-Power Power Supply for Scanning Magnets of CNAO Accelerator
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3643 |
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- M. Incurvati
OCEM spa, San Giorgio di Piano Bologna
- F. Burini, M. F. Farioli, G. Taddia
O. C.E. M. S.p. A., Bologna
- I. De Cesaris, C. Sanelli, F. Voelker
INFN/LNF, Frascati (Roma)
- M. Donetti, S. Toncelli
CNAO Foundation, Milan
- S. Giordanengo, F. Marchetto
INFN-Torino, Torino
- G. Venchi
University of Pavia, Pavia
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The paper presents the design aspects and performance measurements of the CNAO Scanning Magnets’ power supply (PS) rated ±550A/±660V and developed in collaboration between OCEM SpA and INFN-CNAO. CNAO is a medical synchrotron producing carbon ions and protons for the cure of deep tumours. The Scanning Magnets are dipole magnets used to move the beam in an x-y plane at the very end of the beam extraction line. The PS current will be set in order to cover the targeted tumour area. To accomplish such a task the specifications of the PS are very stringent: current ramp speed is required to be as fast as 100 kA/s with an overall precision class of 100 ppm. Moreover the wide (20x20 cm2) area to be covered by the beam requires a wide current range. High voltage peaks are required during transients whereas low voltage is needed during steady state. The above characteristics are challenging design issues both with respect to topology and control optimization.
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