Resonant decrease of the parametric instability threshold by the pump frequency modulation

V. Arkhipenko, L. Simonchik, V. Budnikov, E. Gusakov, N. Kaganskaya, V. Selenin

Research output: Book/ReportReportProfessional

Abstract

The pump wave frequency modulation, as well as the plasma nonstationarity, are well known to stabilize the parametric decay instabilities because of the mismatch of the decay condition for wave frequencies w0(t) = w1(t) + w2(t). The plasma inhomogeneity also increases the decay instability threshold due to convective losses of parametrically excited waves from the narrow interaction region in the vicinity of the so called decay point xd, where the decay condition k0(x) = k1(x) + k2(x) for the wave numbers is fulfilled. In the present paper the simultaneous influence of these two factors on the decay instability of the lower hybrid wave in magnetized plasma is studied. The strong increase of the amplitude of decay waves is observed for the narrow range of the pump frequency modulation rates. The drift of decay point xd = xd(t) due to the pump frequency modulation is shown to be responsible for this effect, which occurs when the decay point velocity is equal to the group velocity of one of the parametrically driven waves. The suppression of convective losses is proved to take place under these conditions. The dependence of amplitude of the decay waves on pump power and on the range of variation of pump frequency is studied for this resonance.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages24
ISBN (Print)951-38-4652-0
Publication statusPublished - 1995
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.214
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

frequency modulation
pumps
thresholds
decay
group velocity
inhomogeneity
retarding

Keywords

  • plasma
  • plasma waves
  • plasma instability
  • reduction
  • resonance
  • pumps
  • frequency
  • modulation

Cite this

Arkhipenko, V., Simonchik, L., Budnikov, V., Gusakov, E., Kaganskaya, N., & Selenin, V. (1995). Resonant decrease of the parametric instability threshold by the pump frequency modulation. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 214
Arkhipenko, V. ; Simonchik, L. ; Budnikov, V. ; Gusakov, E. ; Kaganskaya, N. ; Selenin, V. / Resonant decrease of the parametric instability threshold by the pump frequency modulation. Espoo : VTT Technical Research Centre of Finland, 1995. 24 p. (VTT Publications; No. 214).
@book{776d88f9069c4f0a9a35fd4f28e71fa2,
title = "Resonant decrease of the parametric instability threshold by the pump frequency modulation",
abstract = "The pump wave frequency modulation, as well as the plasma nonstationarity, are well known to stabilize the parametric decay instabilities because of the mismatch of the decay condition for wave frequencies w0(t) = w1(t) + w2(t). The plasma inhomogeneity also increases the decay instability threshold due to convective losses of parametrically excited waves from the narrow interaction region in the vicinity of the so called decay point xd, where the decay condition k0(x) = k1(x) + k2(x) for the wave numbers is fulfilled. In the present paper the simultaneous influence of these two factors on the decay instability of the lower hybrid wave in magnetized plasma is studied. The strong increase of the amplitude of decay waves is observed for the narrow range of the pump frequency modulation rates. The drift of decay point xd = xd(t) due to the pump frequency modulation is shown to be responsible for this effect, which occurs when the decay point velocity is equal to the group velocity of one of the parametrically driven waves. The suppression of convective losses is proved to take place under these conditions. The dependence of amplitude of the decay waves on pump power and on the range of variation of pump frequency is studied for this resonance.",
keywords = "plasma, plasma waves, plasma instability, reduction, resonance, pumps, frequency, modulation",
author = "V. Arkhipenko and L. Simonchik and V. Budnikov and E. Gusakov and N. Kaganskaya and V. Selenin",
note = "Project code: ENE0630 Project code: ENE9606",
year = "1995",
language = "English",
isbn = "951-38-4652-0",
series = "VTT Publications",
publisher = "VTT Technical Research Centre of Finland",
number = "214",
address = "Finland",

}

Arkhipenko, V, Simonchik, L, Budnikov, V, Gusakov, E, Kaganskaya, N & Selenin, V 1995, Resonant decrease of the parametric instability threshold by the pump frequency modulation. VTT Publications, no. 214, VTT Technical Research Centre of Finland, Espoo.

Resonant decrease of the parametric instability threshold by the pump frequency modulation. / Arkhipenko, V.; Simonchik, L.; Budnikov, V.; Gusakov, E.; Kaganskaya, N.; Selenin, V.

Espoo : VTT Technical Research Centre of Finland, 1995. 24 p. (VTT Publications; No. 214).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Resonant decrease of the parametric instability threshold by the pump frequency modulation

AU - Arkhipenko, V.

AU - Simonchik, L.

AU - Budnikov, V.

AU - Gusakov, E.

AU - Kaganskaya, N.

AU - Selenin, V.

N1 - Project code: ENE0630 Project code: ENE9606

PY - 1995

Y1 - 1995

N2 - The pump wave frequency modulation, as well as the plasma nonstationarity, are well known to stabilize the parametric decay instabilities because of the mismatch of the decay condition for wave frequencies w0(t) = w1(t) + w2(t). The plasma inhomogeneity also increases the decay instability threshold due to convective losses of parametrically excited waves from the narrow interaction region in the vicinity of the so called decay point xd, where the decay condition k0(x) = k1(x) + k2(x) for the wave numbers is fulfilled. In the present paper the simultaneous influence of these two factors on the decay instability of the lower hybrid wave in magnetized plasma is studied. The strong increase of the amplitude of decay waves is observed for the narrow range of the pump frequency modulation rates. The drift of decay point xd = xd(t) due to the pump frequency modulation is shown to be responsible for this effect, which occurs when the decay point velocity is equal to the group velocity of one of the parametrically driven waves. The suppression of convective losses is proved to take place under these conditions. The dependence of amplitude of the decay waves on pump power and on the range of variation of pump frequency is studied for this resonance.

AB - The pump wave frequency modulation, as well as the plasma nonstationarity, are well known to stabilize the parametric decay instabilities because of the mismatch of the decay condition for wave frequencies w0(t) = w1(t) + w2(t). The plasma inhomogeneity also increases the decay instability threshold due to convective losses of parametrically excited waves from the narrow interaction region in the vicinity of the so called decay point xd, where the decay condition k0(x) = k1(x) + k2(x) for the wave numbers is fulfilled. In the present paper the simultaneous influence of these two factors on the decay instability of the lower hybrid wave in magnetized plasma is studied. The strong increase of the amplitude of decay waves is observed for the narrow range of the pump frequency modulation rates. The drift of decay point xd = xd(t) due to the pump frequency modulation is shown to be responsible for this effect, which occurs when the decay point velocity is equal to the group velocity of one of the parametrically driven waves. The suppression of convective losses is proved to take place under these conditions. The dependence of amplitude of the decay waves on pump power and on the range of variation of pump frequency is studied for this resonance.

KW - plasma

KW - plasma waves

KW - plasma instability

KW - reduction

KW - resonance

KW - pumps

KW - frequency

KW - modulation

M3 - Report

SN - 951-38-4652-0

T3 - VTT Publications

BT - Resonant decrease of the parametric instability threshold by the pump frequency modulation

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Arkhipenko V, Simonchik L, Budnikov V, Gusakov E, Kaganskaya N, Selenin V. Resonant decrease of the parametric instability threshold by the pump frequency modulation. Espoo: VTT Technical Research Centre of Finland, 1995. 24 p. (VTT Publications; No. 214).