Plasma electronics laboratory General Physics Inst., 38 Vavilova str., 119991 Moscow, Russia Tel: (095)135.6387. Fax: (095)135.8011 Head: professor Pavel S. Strelkov e-mail: strelkov@fpl.gpi.ru

• plasma relativistic microwave oscillator
• high-power microwave pulse shortening
• plasma relativistic microwave amplifier

Relativistic velocity of the electron beam excites waves in plasma with:

• … phase velocity close to light speed. This alleviates extraction of microwaves from plasma into vacuum in wide frequency range.
• … group velocity close to light speed. This provides low Q-factor of resonators and, hence, permits high power of microwaves.

Plasma

• …compensates electron beam space charge and (unlike vacuum electronics) permits to utilize electron currents exceeding the vacuum limiting current;
• …allows to tune microwave frequency over a wide range by means of plasma density varying.

Ref.:

M.V.Kuzelev, O.T.Loza, A.A.Rukhadze, P.S.Strelkov, A.G.Shkvarunets. "Plasma Relativistic Microwave Electronics". Plasma Physics Reports, Vol. 27, No. 8, 2001, pp. 669-691.

Cherenkov plasma maser (CPM)

Research is carried out since 1982. During this time:

• · Microwave power 500 MW with the efficiency 10%; registered using the microwave detector and the calorimeter.
  Ref: M.Birau, et al. Proc. 23-th Int. Conf. On Phenomena in ionized gases. (ICPIG'97), Toulouse, July 17-22, 1997, vol. III, pp.46-47.
• Microwave frequency tuning: plasma may be reset during ~ 100 mcs

• Microwave spectrum width of a single pulse may be broad

• Microwave power and the pulse duration remain almost the same throughout the frequency range

• The theory has been developed, numerical model and simulation codes were designed, calculations were conducted

Ref.:

P. S. Strelkov and D. K. Ul'yanov. "Emission Spectra of a Cherenkov Plasma Relativistic Maser Plasma Physics Reports", Vol. 26, No. 4, 2000, pp. 303-307.

O. T. Loza, I. E. Ivanov. "High-current magnetized REB generated by a field-emission cathode, with the geometry and angular spectrum invariable during microsecond intervals." Proc. of Int. Symp. on electromagnetic environments and consequences (EUROEM'2000), May 30 - June 2, Edinburgh, Scotland, 2000.

P. S. Strelkov, D. K. Ulyanov. "Relativistic X-band plasma maser with 7-fold frequency tuning at 50-MW power level". Proc. of Int. Symp. on electromagnetic environments and consequences (EUROEM'2000), May 30 - June 2, Edinburgh, Scotland, 2000.

O. T. Loza, and I. E. Ivanov. "Measurement of the angular spectrum of electrons in a high-current magnetized REB with microsecond duration". Proc. of 13-th Int. Conference on High Power Particle Beams (Beams'2000), June 25 - 30, Nagaoka, Japan, 2000.

I. L. Bogdankevich, I. E. Ivanov, O. T. Loza, et al. "Narrow-band radiation regime of tunable relativistic Cherenkov plasma maser". AMEREM 2002 Symposium, 2-7 June 2002, Annapolis, Maryland, USA

I. L. Bogdankevich, I. E. Ivanov, O. T. Loza, et al. "Temporal evolution of the microwave spectrum in the course of a radiation pulse from a relativistic Cherenkov plasma maser". International Power Modulator Conference and High Voltage Workshop. June 30 - July 3, 2002, Hollywood, California, USA.

O. T. Loza. "On the mechanism of HPM pulse shortening in oscillators driven by relativistic electron beams"

A. V. Ponomarev, P. S. Strelkov. "Experimental Investigations of Cherenkov Plasma Amplifier"

I. L. Bogdankevich, P. S. Strelkov, V. P. Tarakanov, D. K. Ulyanov. "The influences of reflected electrons on the REB potential and on the energy distribution function of the REB electrons"

A. G. Shkvarunets. "A broadband microwave calorimeter of large cross section". Instruments and Experimental Techniques, vol. 39, No. 4, 1996, pp. 535-538.

O.T.Loza, A.V.Ponomarev, P.S.Strelkov, et al. "Source of an annular controlled-radius plasma for a plasma relativistic microwave oscillator". Plasma Physics Reports, vol.23, No.3, pp.201-208, 1997.

I. L. Bogdankevich, P. S. Strelkov, V. P. Tarakanov, et al. "A calorimetric spectrometer measuring single pulses of relativistic microwave generators". Instruments and Experimental Techniques, vol. 43, No. 1, 2000, pp. 82-87.

P. S. Strelkov and D. K. Ul'yanov. "Emission Spectra of a Cherenkov Plasma Relativistic Maser" Plasma Physics Reports, Vol. 26, No. 4, 2000, pp. 303-307.

I. L. Bogdankevich, I. E. Ivanov, O. T. Loza, et al. "Fine Structure of the Emission Spectra of a Relativistic Cherenkov Plasma Maser". Plasma Physics Reports, Vol. 28, No. 8, 2002, pp. 690-698.

M.V.Kuzelev, O.T.Loza, A.A.Rukhadze, P.S.Strelkov, A.G.Shkvarunets. "Plasma Relativistic Microwave Electronics". Plasma Physics Reports, Vol. 27, No. 8, 2001, pp. 669-691.

A. V. Ponomarev, P. S. Strelkov, and A. G. Shkvarunets. Tunable Plasma Relativistic Microwave Amplifier. Plasma Physics Reports, vol. 26, No. 7, 2000, pp. 592–597.