CONTROLLING THE BEAM OF THE MAGNETRON GUN WITH A SECONDARY-EMISSION CATHODE BY MEANS OF A MAGNETIC FIELD OF THE SOLENOID AND PERMANENT RING-SHAPED MAGNETS

N.I. Ayzatsky, A.N. Dovbnya, V.V. Zakutinª, N.G. Reshetnyak, N.A. Dovbnya, I.A. Chertishchev

National Science Center Kharkov Institute of Physics and Technology, Kharkov, Ukraine

Abstract

The report is concerned with the possibility of monitoring the parameters of the beam in the magnetron gun with a secondary-emission cathode by using magnetic fields of permanent ring-shaped magnets. The measured magnetic-field distributions of permanent magnets are presented. Consideration has been given to the possibility of controlling the beam current and size on the Faraday cup. The experimental results are reported.

ª – corresponding author

Paper 

310 

THE OUTPUT BEAM-LINE AND A NOVEL ION SOURCE OF 2 MeV PROTON RFQ LINAC

B.Yu. Bogdanovich, V.V. Kapinª, A.V. Nesterovich, A.N. Puchkov, V.N. Soloviev, V.P. Zubovskiy, V.V. Yanenko

Moscow Engineering Physics Institute (State University), Moscow, Russia

Abstract

The 2 MeV 150 MHz proton RFQ linac is set up at the Radiation-Acceleration Center (RAC) of Moscow-Engineering Physics Institute (MEPhI), the State University. It has the output beam-line consisting of a doublet of the electrostatic focusing lenses, the post-accelerating 7-gap two-ridge interdigital H-resonator and a magnetic C-shaped spectrometer with vertical magnetic field. An unconventional design of the electrostatic lens featured by the two-dimensional electric field and wire-meshed beam apertures is implemented. Such lens provides a transverse focusing effect only in one plane, while does not affect on the beam in a perpendicular plane. In the 7-gap post-accelerating structure, the output energy of RF beam-bunches can be monotonically increased within the beam-pulse. It results in an amplification of the peak value of the beam current on a distant target. A novel ion source with an increased life span is developed. It combines the principles of duoplasmatron and RF ion source. In this report, designs and parameters of the output beam-line components and the ion source are described. The beam optics is evaluated with TRACE-3D code.

ª – corresponding author

Paper 

307