• А.S.Bеlоv, V.I.Derbilov, S.K.Esin, A.V.Feschenko, O.T.Frolov, V.S.Klenov, E.S.Nikulin, V.L.Serov, V.P.Yakushev, V.N.Zubets
  Institute for Nuclear Research, Moscow, Russia

The H- injector has to provide a beam with the following parameters: mean current; up to 400uA; pulse duration; up to 200us; pulse repetition rate; 50Hz; energy of ions; 400keV. The surface-plasma H- ion source developed in BINP, Novosibirsk is used. Pulsed accelerating voltage source of 400kV and pulsed high-voltage modulators for H- ion source power supply with a discharge current up to 120A and extracting voltage up to 20kV have been fabricated and tested. Commissioning of the H- injector is scheduled by the end of 2006.

378

• V.E.Akimov, A.V.Bulatov, P.V. Logatchev, I.V.Kazarezov, A.A.Korepanov, D.A.Maliutin, A.A.Starostenko, A.A.Pachkov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The electron miniaccelerator for the charged particles beam nondestructive diagnostics with operating voltage 200 kV, half-wave duration 4 mks and beam current within few mA is described. The primary circuit is switched by IGBT. The gun control and filament circuit power supply are performed through high frequency isolated transformer. The accelerating tube is performed from sectional welded metal ceramics insulator (ceramics 22 XC with diameter 95/85 mm). The accelerator test results are presented.

381

• P.A.Golubev, V.E.Karlin, E.I.Kolobanov, S.A.Krutihin, G.Ya.Kurkin, V.K.Ovchar, S.S.Serednyakov, S.V.Tararyshkin, N.A.Vinokurov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The device for forming pulsed electron current for injection into accelerators was designed and realized. The pulse current duration is 0.5 ns and average electron current is from zero up to 110 mA. The charge of electron pulse is variable from zero up to 1.5 nC.

384

• V.E.Akimov, A.V.Ivanov, I.V.Kazarezov, A.A.Korepanov, IA.V.Kulenko, G.I.Kuznetsov, M.I.Tiunov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The pulsed electron beam source on voltage 200 kV and current 10 A with half-height pulse duration 3 ns is described. The gun is based on the dispenser cathode with 20 mm diameter. The current control is performed by means of molybdenum grid with the cell size 0.4x0.4 mm and optical transparency of about 0.7. The numerical optimization of cathode-grid unit is carried out. The experimental results obtained are in good agreement with project parameters.

386

• S.Mordyk, V.Miroshnichenko, D.Nahornyy, D.Shulha, V.Storizhko, and V.Voznyy
  Institute of Applied Physics Nat. Acad. Sci., Ukraine

A helicon and a multicusp version of a radio-frequency ion sources with compact permanent magnet systems have developed and tested to show the following performance data: plasma density of 10¹¹ - 9*10¹² cm-3, pressure of 2-10 mTorr, beam current densities of 10 - 130 mA/cm² , brightness ~100 A/(m2rad2eV), energy spread 8-30 eV, and an rf power input into the plasma of 40 - 300 W. Possibilities for a further increase in the brightness of the rf ion sources are discussed.

389

• M.I.Ayzatskiy, A.N.Dovbnya, I.V.Khodak, V.A.Kushnir, V.V.Mytrochenko
  The National Science Center "Kharkov Institute of Physic and Technology" (KIPT), Kharkov, Ukraine

Electron beams with charge up to 100 nC in a nanosecond current pulse can be generated by photoemission RF guns. Thermal heating of a cathode caused by high power flow density of laser pulse limits the increasing of the pulse charge. The alternative way the high charge can be achieved in RF guns is the application of cathodes with plasma-assisted electron emission. The feature of the cathodes is high emission current density (>10² А/cm²). It was proposed earlier to apply in RF guns plasma cathodes based on ferroelectrics. Results of beam dynamics simulation and results of the experimental research of one-cell S-band RF gun operation with driven plasma cathode are considered in the paper. Results of operation of experimental samples of the cathode are provided and analysed.

392