Kapin, V.V.
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INFLUENCE OF BEAM SPACE CHARGE ON DYNAMICAL APERTURE OF TWAC STORAGE RING |
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V.V. Kapinª, A.Ye. Boshakov, P.R. Zenkevich Alikhanov Institute for Theoretical and Experimental Physics, Moscow, Russia Abstract High intensity ion beams are planned to store in Terra Watt Accumulator (TWAC) at ITEP (Moscow). A size of the phase-space domain where one can safely operate with the beam is related to the dynamic aperture (DA). The DA measured in units of Courant-Snyder invariant is studied numerically with account of the space charge forces (the "frozen core" model) and perturbations of the guiding magnetic field for particles with non-zero momentum deviations. An economical DA-algorithm used for SIS-100 studies with the "Micromap-code" developed at GSI (Darmstadt) has been implemented for MADX-code via its macro-scripts. The results have shown a significant dependence of DA on intensity, especially for particles with a non-zero momentum deviation. ª – corresponding author |
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THE OUTPUT BEAM-LINE AND A NOVEL ION SOURCE OF 2 MeV PROTON RFQ LINAC |
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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 |
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THE PROJECT OF RFQ LINAC FOR AN EDUCATIONAL LABORATORY AT RAC OF MEPHI |
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B.Yu. Bogdanovich, V.V. Kapinª, A.V. Nesterovich Moscow Engineering Physics Institute (State University), Moscow, Russia Abstract RFQ linac of light ions with the energy up to 2-MeV/amu and the charge-to-mass ratio ≤1/3 is proposed at the Radiation-Acceleration Center (RAC) of Moscow-Engineering Physics Institute (MEPhI). The accelerator is intended for educational and research purposes. In the report, RFQ designs with two different frequencies of 150 MHz and 433 MHz are considered as possible candidates. Two types of the RFQ designs using either a constant or an increasing intervane-voltage distribution along the structures are compared and discussed. The former type is a conventional RFQ, and the latter type allowing an in-creased energy gain results in a shorter accelerating struc-ture, while it requires a higher RF power. ª – corresponding author |
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