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 

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