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P.94. A.N.Dovbnya, V.V.Zakutin, N.G.Reshetnyak, V.P.Romasko (Kharkov Institute of Phys- ics and Technology, Kharkov, Ukraine)

ELECTRON BEAM FORMING IN THE MAGNETRON GUN WITH

SECONDARY-EMISSION MATERIALS

CATHODES

OF

DIFFERENT

A magnetron gun with a cold secondary-emission cathode in crossed fields is used as an electron source in the high-energy RF-devices. Experiments were carried out using the secondary-emission cathodes made of different metals: copper, aluminum, titanium, stainless-steel (cathode diameter of 40 mm, gun length of 140 mm). In experiments the electron beam production was observed. It has been established that the beam current de- pendence on the voltage obeys to the 3/2 law. Experiments demonstrated that despite the fact that the coefficient of secondary emission in the case of aluminum and titanium is less than unity, the processes of secondary-emission multiplication take place, apparently, on the cathode surface oxide layers formed in technical vacuum below 10-5 - 10-6 Torr and with the presence of organic materials inside the chamber.

Dr. Valeriy Zakutin: zakutin@kipt.kharkov.ua

  • P.

    95. E.I.Kolobanov, A.N.Matveenko, T.V.Salikova, S.S.Serednyakov, O.A.Shevchenko,

    • N.

      A.Vinokurov (Budker Institute of Nuclear Physics, Novosibirsk, Russia) The study of the energy recovery efficiency at Novosibirsk FEL ERL. 12 MeV energy recovery non-superconducting linac of the Novosibirsk terahertz FEL is put into operation in 2003. The efficiency of energy recovery was studied. The transversal and longitudinal beam halo was investigated by studying the dependence of the beam dump current on steering corrector strength and RF system parameters. Ways to increase energy recovery efficiency are discussed.

Alexander Nikolaevich Matveenko: A.N.Matveenko@inp.nsk.su

P.96. Yu.D.Chernousov, V.I.Ivannikov, I.V.Shebolaev (ICKC, Novosibirsk, Russia)

Possibility of stabilizing the beam energy in resonant accelerator on the leading edge of the microwave pulse

The effect of transients in the accelerating cavity by successive switching of generator and beam is discussed. The possibility of stabilizing energy increase in the process of transi- tion oscillations in the cavity is demonstrated. With allowance made for the beam current the delay of injection can be chosen in such a way that the amplitude and phase of oscilla- tions in the cavity change so that the two factors compensate for each other. It allows to eliminate the energy spread caused by the transients.

Vladimir Ivanovich Ivannikov: ivnvl@mail.ru

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