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P.134. S.Mordyk, V.Miroshnichenko, D.Nahornyy, D.Shulha, V.Storizhko, and V.Voznyy (Insti-

tute of Applied Physics Nat. Acad. Sci., Ukraine)

DEVELOPMENT OF THE RF ION SOURCE ACCELERATOR-BASED APPLICATIONS

FOR USE IN

A helicon and a multicusp version of a radio-frequency ion sources with compact perma- nent 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.

Dr. Serhiy Mikolaevich Mordyk: mordyk@ipflab.sumy.ua

P.135. 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)

RF ELECTRON GUNS WITH PLASMA-ASSISTED EMISSION CATHODES

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 den- sity 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 (>10 2

/cm2). It was proposed earlier to apply in RF guns plasma cathodes based on ferroelec- trics*. 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.

  • *

    I.V. Khodak, V.A. Kushnir. Performances of the beam generated by metal-dielectric

cathodes in RF electron guns. Proc. EPAC04, Lucerne, Switzerland, p.767-768.

Prof. Volodymyr Abramovich Kushnir: kushnir@kipt.kharkov.ua

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