Demonstration of efficiency enhancement in a high power backward wave oscillator by plasma injection

Carmel,; Destler,; Granatstein,; Minami,; Abé,; Lou,; Kehs,

doi:10.1109/plasma.1989.166256

Cited by 3 publications

(6 citation statements)

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“…The enhancement of the output power compared with vacuum BWO occurred over a range of guiding magnetic field strength. On the other hand, in the case of plasma-injected BWO, eight times output power enhancement over the vacuum case was measured, when a controlled amount of plasma was injected into the SWS [6]. Characteristics of an SWS including radially inhomogeneous plasma were investigated in detail [7].…”

Section: Dependence On Axial Magnetic Field Of Radiationmentioning

confidence: 99%

“…Grabowski et al examined in detail plasma-injected BWO using a cathode-mounted plasma prefill source [11]. In the previous plasma-injected BWO, the plasma source was mounted downstream of the SWS [6]. On the other hand, they installed the plasma source up-stream inside the cathode structure in a region of uniform magnetic field.…”

Section: Dependence On Axial Magnetic Field Of Radiationmentioning

confidence: 99%

“…For the purpose of investigating the effect of plasma in the SWS in detail, plasma-injected BWO [6], [8], and [11], is preferable to a gas-filled BWO [2]- [5] because of better control of plasma parameters. In gas-filled BWO, a complicated and uncontrollable ionization process might be occurring.…”

Section: Dependence On Axial Magnetic Field Of Radiationmentioning

confidence: 99%

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Dependence on axial magnetic field of radiation from a high-power gas-filled backward wave oscillator

Minami

Kobayashi²,

Hayatsu³

et al. 2002

IEEE Trans. Plasma Sci.

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Microwave output power from a high-power heliumfilled backward wave oscillator (BWO) operating at X band is measured as a function of the strength of guiding magnetic field and helium gas pressure. Tenuous helium gas filling the slow wave structure is ionized by an injected electron beam with typical parameters of energy 100 keV and current 0.5 kA. The enhancement of output power from the present gas-filled BWO is less than those reported in some previous publications. Near = 0.8 T, we observe the minimum value of output that is judged to result from cyclotron absorption caused by resonant interaction of the fast electron cyclotron mode with the Cherenkov radiation. On both sides of the absorption, two peak outputs near = 0.5 and 1.0 T are measured. In the former case, the output is enhanced compared with vacuum case by the presence of helium gas with pressure of a few mtorr. In the latter case, on the other hand, the output monotonously decreases with the gas pressure. The output powers for the latter case are larger than those of the former case. Both cases are observed repeatedly for various experimental conditions. The physical reasons for the observed results are discussed.Index Terms-Backward wave oscillator (BWO), cyclotron absorption, enhanced radiation, high-power microwave, pulse shortening, relativistic electron beam, slow wave structure (SWS).

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Section: Dependence On Axial Magnetic Field Of Radiationmentioning

confidence: 99%

Section: Dependence On Axial Magnetic Field Of Radiationmentioning

confidence: 99%

See 1 more Smart Citation

Dependence on axial magnetic field of radiation from a high-power gas-filled backward wave oscillator

Minami

Kobayashi²,

Hayatsu³

et al. 2002

IEEE Trans. Plasma Sci.

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“…Many theories have been employed to explain the efficiency enhancement [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In this paper, plasma filled in the microwave device has been regarded as plasma photonic crystals [20].…”

Section: Introductionmentioning

confidence: 99%

Plasma photonic crystal

Zhao

Cui

et al. 2009

Front. Optoelectron. China

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Plasma photonic crystals are presented in this paper. A plasma photonic crystal can control the propagation of electromagnetic waves. Similar to other photonic crystals, the permittivity of a plasma photonic crystal is distributed as periodic arrays. The properties of periodic arrays of plasma can broaden the range of frequency and enhance the efficiency of beam-wave interaction. In special uses, the behavior of plasma shows that it has properties of photonic crystals.

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“…There have been many papers addressed on the gasloaded microwave devices [6,7]. Generally, an enhancement in the beam-wave interaction is believed due to the background plasma induced by the beam ionising the gas.…”

Section: Introductionmentioning

confidence: 99%