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P.92. Petar Belicev, Nebojsa Neskovic, Milan Rajcevic (Vinca Institute of Nuclear Sciences, Belgrade), Evgeny Perepelkin, Alexey Vorozhtsov, Sergey Vorozhtsov (Joint Institute Nuclear Research /DLNP, Dubna, Moscow Region)

ION BEAM CYCLOTRON

DYNAMICS

SIMULATIONS

FOR

THE

VINCY

The VINCY Cyclotron has to accelerate ions operating with the harmonic number of the RF voltage equal to 1, 2, 3 and 4. Two different central region configurations have been designed in order to satisfy the need for the broad ranges of ion species and energies that are expected to be obtained from the machine. The latest design of the spiral inflector, in the axial injection line, was used in the simulations. We present here only the results of the H–ion beam dynamics simulations. The ion tracking calculations were performed us- ing the CBDA code. The electric and magnetic field maps were obtained using the TOSCA/OPERA3D and MERMAID codes. The measured magnetic field maps were also used. The main criteria used in the simulations were the good centering, the highest possi- ble energy gain in the accelerating gaps, the maximal transmission through the central and acceleration regions, and the best possible quality of the ion beam at the extraction radius. The overall performance of the machine was optimized by adjusting the corresponding operational parameters.

Dr. Sergey Borisovich Vorozhtsov: vorozh@nu.jinr.ru

  • P.

    93. N.I.Ayzatskiy, A.N.Dovbnya, V.V.Zakutin, V.N.Boriskin, V.V.Mitrochenko,

    • N.

      G.Reshetnyak, V.P.Romasko, N.A.Dovbnya (Kharkov Institute of Physics and Tech- nology, Kharkov, Ukraine)

ELECTRON

BEAM

FORMATION

IN

THE

SECONDARY-

EMISSION SOURCES WITH A UNIFORM AND NONUNIFORM ELECTRIC AZIMUTHAL ELECTRIC FIELD

The paper reports the results of experimental studies on formation of electron beams in three types of secondary-emission sources. Experiments were carried out with a magne- tron gun having a cylindrical anode (70 mm in diameter): 1) with a smooth cathode (40 mm in diameter) and a modified cathode: 2) with 4 longitudinal seams and 3) composed of 8 copper rods (5 mm in diameter). Parameters of beams were studied and beam inden- tations were obtained. In the first case the beam formation occurs with a current of ~40 A (at a cathode voltage of 40 kV) and an azimuthal uniformity of ±5 %. In the second case, at a field nonuniformity of ~30%, the azimuthal nonuniformity is ~15 A. In the third case, at a field nonuniformity of ~60% there occurs formation of 8 separate beams having the form close to the half-ring and with a total current of ~10A (at a cathode voltage of 30 kV). The beam current amplitude stability in all the cases was 2 ... 5 %.

Dr. Mykola Reshetnyak: zakutin@kipt.kharkov.ua

94

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