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

The 2-MeV 150-MHz proton RFQ linac is set up at the Radiation-Acceleration Center (RAC) of MoscowEngineering Physics Institute (MEPhI), the State University. It has the output beam-line consisting of a doublet of the electrostatic focusing lenses, the post-accelerating 7gap two-ridge interdigital H-resonator and a magnetic Cshaped 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 postaccelerating structure, the output energy of RF beambunches can be monotonically increased within the beampulse. 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.