Publications
 
Publications
 
 
   

Russian Vacuum Electronics (reference materals).
Ed. M.I. Petelin

NEW VARIETIES OF CYCLOTRON RESONANCE MASERS

V.L.Bratman, A.B.Volkov, G.G.Denisov, N.G.Kolganov, Yu.K.Kalynov, V.N.Manuilov, M.M.Ofitserov, S.V.Samsonov, A.V.Savilov, A.E.Fedotov
Institute of Applied Physics, Russian Academy of Sciences

New results for gyrodevices with thin helical beams of electrons encircling the axes of axi-symmetrical microwave systems are presented.

 

Type of emission

Electron beam

Cyclotron harmonic

Frequency, GHz

Power, MW

Efficiency,
%

Frequency bandwidth, %

Gain, dB

CARM-GYROTRON 1

explosive

460 keV,
60 A, 20 ns

1+2

40

6

22

 

 

explosive

400 keV, 50 A,20 ns

1+2

36

4

20

 

 

CARM-BWO 2

explosive

400 keV,
50 A,20 ns

1+2

33

3 .4

15

5

 

LOG 3

thermionic

250 keV,
5A, 10 m s

3, 4

115, 130

0.1

4

 

 

HELICAL GYRO-TWT 4

explosive

185 keV,
20 A, 100 ns

2

9.4

1 .1

29

21

37

thermionic

80 keV, 8.5 A, 10 ms

2

36

0.18

26

10

30

1 The CARM-gyrotron is based on co-generation of traveling and near-cutoff waves, which are excited at the same frequency, but at different cyclotron harmonics. The near- cutoff wave is needed to provide the feedback, whereas the traveling wave provides a high efficiency of the electron energy extraction.
2 The CARM-BWO is similar to the CARM-gyrotron, but an opposite wave is used instead of the near-cutoff one.
3 Large Orbit Gyrotron.
4 Gyro-TWT with a novel operating waveguide. A proper helical corrugation of waveguide walls provides unique dispersion characteristics of the operating wave, namely, a controllable group velocity in the region of the zero axial wavenumber .

36 GHz Gyro-TWT. Dispersion characteristics of the operating wave, interaction region, and a photograph of the device.