A plasma filled gyrotron-pumped free-electron laser

Sharma, Anamika; Tripathi, V. K.

doi:10.1063/1.871658

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…The electron beam interaction with a copropagating laser beam in the plasma medium has been a focus of research for the past two decades due to a vast range of applications including inertial confinement fusion (ICF) [1], plasma accelerator physics [2][3][4], microwave electronics [5,6], x-ray lasers [7], free electron lasers [8], solar corona [9,10] and other astrophysical phenomena [11,12]. A return current carried by plasma electron is induced by the electron beam.…”

Section: Introductionmentioning

confidence: 99%

Effect of spin-polarization on filamentation in magnetized quantum plasma

Kumar

Ahmad²

2022

Phys. Scr.

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A theoretical study analysing the effects of spin- polarization resulting from the difference in concentration of the oppositely spinning electrons on the filamentation instability of an intense laser beam propagating in magnetized quantum plasma. The ponderomotive force has been evaluated taking into account the electron’s Fermi pressure, quantum Bohm potential and electron’s spin. The effective dielectric constant has been calculated. For the filamentaton instability, the dispersion relation has been established and the growth rate has been studied analytically. The spin-polarization is found to enhance the filamentation.

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Section: Introductionmentioning

confidence: 99%

Effect of spin-polarization on filamentation in magnetized quantum plasma

Kumar

Ahmad²

2022

Phys. Scr.

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“…One of the interesting ways to overcome these problems is to employ plasmas with FELs (Kiselev et al, 2004;Ganeev, 2012). Introducing plasma into the interaction region may confine the electron beam and hold the focus of the pump wave (Sharma & Tripathi, 1996). In addition, the radiation can be confined to some degree by dielectric guiding by the plasma since the dielectric constant in the beam is larger than that of the outside plasma due to the relativistic mass increase of its electron (Ganeev, 2012).…”

Section: Introductionmentioning

confidence: 99%

Quantum regime of a plasma-wave-pumped free-electron laser in the presence of an axial magnetic field

Shirvani

Jafari

2018

J Synchrotron Radiat

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The quantum regime of a plasma-whistler-wave-pumped free-electron laser (FEL) in the presence of an axial-guide magnetic field is presented. By quantizing both the plasma whistler field and axial magnetic field, an N-particle three-dimensional Hamiltonian of quantum-FEL (QFEL) has been derived. Employing Heisenberg evolution equations and introducing a new collective operator which controls the vertical motion of electrons, a quantum dispersion relation of the plasma whistler wiggler has been obtained analytically. Numerical results indicate that, by increasing the intrinsic quantum momentum spread and/or increasing the axial magnetic field strength, the bunching and the radiation fields grow exponentially. In addition, a spiking behavior of the spectrum was observed with increasing cyclotron frequency which provides an enormous improvement in the coherence of QFEL radiation even in a limit close-to-classical regime, where an overlapping of these spikes is observed. Also, an upper limit of the intrinsic quantum momentum spread which depends on the value of the cyclotron frequency was found.

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“…The free electron laser amplifier (FELA) is an attractive device to employment of an electrostatic and electromagnetic wiggler for the production of tunable and coherent high power radiated signal using with mildly relativistic electron beams (REBs) to the higher frequencies from sub millimetre wave to optical ranges. In the interaction region, the synchronism of the pumped frequency with strong magnetized plasma, it should be closed to electron cyclotron frequency which is resonantly enhanced the wiggler wave number that produces the amplifier radiation in slow whistler mode, however, below the electron cyclotron frequency, the frequency emission of radiation is limited [1] [2]. The operating radiation frequency of FEL Amplifier 1  scales with wiggler period o  and beam Lorentz factor or the relativistic gamma factor () o  of the electron beam, where b E is the beam kinetic energy, m is the rest mass of electrons and c is the light velocity in vacuum [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of axial magnetic field tapering on whistler-pumped FEL amplifier in collective Raman regime operation

Gopal

Jain²

2018

IJET

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The dispersion relation of the FEL Amplifiers is sensitive to the linear tapered strong axial magnetic fields, electron cyclotron frequency and plasma frequency of electrons. For the synchronism of the pumped frequency, it should be closed to electron cyclotron frequency which is resonantly enhanced the wiggler wave number that produces the amplifier radiation for higher frequency from sub millimeter wave to optical ranges. The guiding of radiation signal into the waveguide and charge neutralization phenomenon, the beam density should be greater than the background plasma density with tapered strong axial magnetic field. It is quite considerable that radiation signal slowed down at much higher background plasma density comparable to the density of beams and enhanced the instability growth rate also. In Raman Regime operation, the growth rate decreases as increases with operation frequency of the amplifier, however, the growth rate is larger in this regime. It is noted that as increases with background plasma density, the beat wave frequency of the Ponderomotive waves is increases thus the mechanism of background plasma density can serve for tenability of the higher frequencies. The tapering of the strong guided magnetic field is a crucial role for enhancing the efficiency of the net transfer energy as well as reduction of interaction region along the axis. It is observed that, an efficiency of the transfer energy enhanced by while the reduction along the interaction region of about with the variation of tapering in a strong axial guided magnetic fields.

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A plasma filled gyrotron-pumped free-electron laser

Cited by 10 publications

References 11 publications

Effect of spin-polarization on filamentation in magnetized quantum plasma

Effect of spin-polarization on filamentation in magnetized quantum plasma

Quantum regime of a plasma-wave-pumped free-electron laser in the presence of an axial magnetic field

Effect of axial magnetic field tapering on whistler-pumped FEL amplifier in collective Raman regime operation

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