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P.100. V.G.Kurakin (Lebedev Physical Institute, Moscow, Russia) Self Consistent High Current Beam Dynamics in Racetrack Microtron

So far, pulsed racetrack microtron was evolved as an alternative to a classical microtron in order to increase an electron beam energy as well as to improve the beam quality. Lebe- dev Physical institute racetrack microtron seems to be the only one that does not fit the logic mentioned and demonstrates the efficiency of the parallel acceleration in a single rf structure compared to multi section rf linac for high intensity beams. The intensity auto modulation that had been observed for this machine does not results in absolute current limitation because could be overcome by better injection. To find out other limitations as well non traditional racetrack applications, the computer simulation of self consistent beam dynamics has been undertaken in this paper. Formulas for a acceleration cavity ex- citation by the electron beam and an external rf generator are derived, followed by nu- merical computer calculations of bunch train longitudinal dynamics. In this simulation, higher order symmetrical TM modes are taken into account. The results are presented in the form of the plots and histograms, the possible short beam pulse racetrack applications are discussed as well.

Dr. Vyacheslav Grigoryevich Kurakin: kurakin@x4u.lebedev.ru

P.101. A.N.Dovbnya, V.V.Zakutin, N.G.Reshetnyak (Kharkov Institute of Physics and Technol-

ogy, Kharkov, Ukraine) INVESTIGATION

OF

ELECTRON

BEAM PARAMETERS IN

MAGNETRON GUNS AT REDUCED VOLTAGES

The paper presents the results from investigations into the generation of electron beams and their parameters in magnetron guns with secondary-emission cathodes. The beam pa- rameters were investigated for two cases. In the first case the magnetron gun cathode di- ameter was 40 mm, and the anode diameter was 70 mm. In the second case the magnetron gun cathode diameter was 2 mm, and the anode diameter was 7 mm. The experiments have shown that in the first case, with the anode diameter of 70 mm and the cathode volt- age of 10 kV, the beam current was 7.5 A. The magnetic field value was 600 Oe. At a cathode voltage of 6 kV the beam current was 3A, however, then the amplitude and the triggering pulse decay rate should be increased to 100 kV/mks. In the second case at a pulse decay of ~1200 kV/mks and a cathode voltage of 7 kV the beam current was 2 A at a magnetic field value of ~3000 Oe. The beam current as a function of the amplitude and the magnetic field distribution was studied.

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

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