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"Development of high intensity ion sources for a Tandem-Electrostatic-Quadrupole facility for Accelerator-Based Boron Neutron Capture Therapy"
J. Bergueiro, M. Igarzabal, J.C. Suarez Sandin, H.R. Somacal, H. Huck, V. Thatar Vento, A.A. Valda, M. Repetto and A.J. Kreiner
Proc. of the "14th International Congress on Neutron Capture Therapy" (14-ICNCT), Buenos Aires, Argentina, October 25-29, 2010. Ed. S. Liberman, A. Kreiner and M. Casal
New Challenges in Neutron Capture Therapy 2010, Comisión Nacional de Energía Atómica (2010) 484-487
ISBN: 978-987-1323-19-7
An ion source test stand has been mounted which consists of an insulated platform capable of holding voltages up to 100 kV. The ion sources are installed at high voltage and the necessary power for heating the tungsten filament and for sustaining the arc discharge against the anode is furnished through an insulation transformer capable of holding up to 100 kV and transferring up to 10 kW. The test stand beam line has extraction electrodes following the ion source, a ceramic-metal acceleration tube, a diagnostic chamber with a viewing port and a ladder with target and collimator holding capability and finally a refrigerated and suppressed Faraday cup to integrate the accelerated ion beam. A dual chamber, filament driven and magnetically compressed monocusp, volume plasma proton ion source has been designed, fabricated and tested. It consists of a plasma generating chamber with a tungsten filament discharging against an anode within a plasma of relatively high density, surrounded by permanent magnets with their north poles facing the axis of the cylindrical chamber in order to generate a monocusp magnetic field. This longitudinal field, parallel to the axis, compresses and concentrates the electron discharge against the aperture connecting to a subsequent expansion cup. The magnetic field penetrates into that chamber further contributing to enhance the hydrogen gas ionization efficiency of the electron discharge. The system is completed by an extraction system. Without transport through the line into the Faraday cup the ion source has been shown to deliver high proton currents up to 50 mA with extraction voltages up to 40-50 kV. In addition a beam of about 4 mA, with a cross section of about 1 cm diameter, has been accelerated and transported into the suppressed Faraday cup, 1 m downstream. Also a duoplasmatron source has been built which will be tested en the near future. Extensive simulations of the sources and the extraction have been performed using both 2D and 3D self consistent codes.
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