TEST OF THE PLASMA LENS OF THE ITEP ION ACCELERATOR

A. Drozdovskiyª, A. Golubev, B. Sharkov, M. Basko, D. Iosseliani, A. Kantsyrev, A. Kuznetsov, Yu. Novozhilov, P. Sasorov, S. Savin, V.V. Yanenko, V. Abramenko, O. Pronin

Alikhanov Institute for Theoretical and Experimental Physics, Moscow, Russia

Abstract

The problem of focusing of intense heavy-ion beams is an important issue for investigating high energy densities in matter. Application of a plasma lens to this area of research has a number of essential advantages in comparison with the traditional system on the basis of quadruple lenses. At ITEP the plasma lens has been designed and installed into the exit channel of the TWAC accelerator complex. The description of the plasma lens and the results of the first experiments with this lens are reported.

ª – corresponding author

Paper 

67

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