Current-Drive Efficiency in a Degenerate Plasma

Son, S.; Fisch, Nathaniel J.

doi:10.1103/physrevlett.95.225002

Phys. Rev. Lett.

2005

DOI: 10.1103/physrevlett.95.225002

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Current-Drive Efficiency in a Degenerate Plasma

S. Son

Nathaniel J. Fisch

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Cited by 66 publications

(60 citation statements)

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“…The group velocity could be almost zero around the band gap and the plasmon could get even reflected, stretched or compressed [20]. The plasmon band gap suggested in this paper would be useful in laser interaction with dense plasmas along with recently discovered new physics [19,21,22].…”

mentioning

confidence: 99%

Plasmon band gap generated by intense ion acoustic waves

Son

2010

Physics of Plasmas

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mentioning

confidence: 99%

Plasmon band gap generated by intense ion acoustic waves

Son

2010

Physics of Plasmas

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“…Possible applications of collective plasma accelerators lie in producing beams of energetic electrons, protons, and gamma rays, as well as femtosecond pulses and compact radiation sources for medicine. Plasma-based charged particle acceleration schemes are also holding promises for extremely high-energy charged particles and radiation sources from astrophysical plasmas as well.However, in very dense plasmas, such as those in astrophysical environments [15][16][17][18] and in the next-generation intense laser-solid density plasma experiments [19][20][21][22][23], there might appear novel effects at the nanoscale owing to the presence of the new electron pressure law and the quantum force involving the Bohm potential [24][25][26][27][28]. This happens because in dense quantum plasmas the electrons degenerate and they follow the Fermi-Thomas distribution.…”

mentioning

confidence: 99%

“…The latter can be exploited for accelerating protons in dense plasmas, such as those in compact astrophysical objects [15][16][17][18] (e.g. interior of white dwarfs), in the next-generation laser-solid density plasma interaction experiments [20][21][22][23], in free electron lasers [38], and in plasmonic devices [33].…”

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confidence: 99%

Excitation of ion wakefields by electromagnetic pulses in dense plasmas

Shukła¹

2009

J. Plasma Phys.

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Abstract. The excitation of electrostatic ion wakefields by electromagnetic pulses in a very dense plasma is considered. For this purpose, a wave equation for the ion wakefield in the presence of the ponderomotive force of the electromagnetic waves is obtained. Choosing a typical profile for the electromagnetic pulse, the form of the ion wakefields is deduced. The electromagnetic wave-generated ion wakefields can trap protons and accelerate them to high energies in dense plasmas.There are many proposals [1][2][3][4][5] for exciting high-phase speed intense electrostatic wakefields by electron bunches and laser beams in an unmagnetized electron-ion plasma [2,4,5]. Large-amplitude electron plasma waves are capable of accelerating electrons to extremely high energies, as demonstrated experimentally [6][7][8][9][10][11][12][13][14]. Possible applications of collective plasma accelerators lie in producing beams of energetic electrons, protons, and gamma rays, as well as femtosecond pulses and compact radiation sources for medicine. Plasma-based charged particle acceleration schemes are also holding promises for extremely high-energy charged particles and radiation sources from astrophysical plasmas as well.However, in very dense plasmas, such as those in astrophysical environments [15][16][17][18] and in the next-generation intense laser-solid density plasma experiments [19][20][21][22][23], there might appear novel effects at the nanoscale owing to the presence of the new electron pressure law and the quantum force involving the Bohm potential [24][25][26][27][28]. This happens because in dense quantum plasmas the electrons degenerate and they follow the Fermi-Thomas distribution.In this letter, we consider the excitation of electrostatic ion wakefields by electromagnetic (EM) waves [29][30][31][32] in a very dense plasma. For this purpose, we use the quantum fluid model for the degenerate electrons and derive the ion wakefield equation in the presence of the ponderomotive force of the EM waves. The profile of the ion wakefield is deduced by assuming a given EM pulse shape. The relevance of our investigation is also mentioned.

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“…However, some physical processes in the regime where x-rays might be compressible are considerably different from those in the visible light regime. There are new physical processes to be considered, such as the Fermi degeneracy and the electron quantum diffraction [11][12][13][14], to mention a few.We consider one key aspect for the BRS in the x-ray compression regime, i.e., the damping of the Langmuir wave. In an ideal plasma, the decay rate of the Langmuir wave increases rapidly as the wavelength decreases.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Backward Raman compression of x-rays in metals and warm dense matters

Son

Moon

2010

Physics of Plasmas

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Experimentally observed decay rate of the long wavelength Langmuir wave in metals and dense plasmas is orders of magnitude larger than the prediction of the prevalent Landau damping theory. The discrepancy is explored, and the existence of a regime where the forward Raman scattering is stable and the backward Raman scattering is unstable is examined. The amplification of an x-ray pulse in this regime, via the backward Raman compression, is computationally demonstrated, and the optimal pulse duration and intensity is estimated.PACS numbers: 52.38.-r, 52.59. Ye, 42.60.Jf Coherent intense x-rays would enable various potential applications [1,2], however, it is very difficult to compress an x-ray pulse, or even in the UV regime. Some progress has been made in this direction, based on the recent advances in the areas of free electron laser [3] and the inertial confinement fusion [4]. It is shown that the backward Raman scattering (BRS) [5,6], where two light pulses and a Langmuir wave interact one another to exchange the energy, is one promising approach to create an ultra short light pulse (down to a few attoseconds [7,8]); a pulse gets compressed and intensified via this laser-plasma interaction. The BRS is successfully used to create intense pulses of the visible light frequencies [9,10]. It is natural to consider the same technique for the x-ray compression [7,8]. However, some physical processes in the regime where x-rays might be compressible are considerably different from those in the visible light regime. There are new physical processes to be considered, such as the Fermi degeneracy and the electron quantum diffraction [11][12][13][14], to mention a few.We consider one key aspect for the BRS in the x-ray compression regime, i.e., the damping of the Langmuir wave. In an ideal plasma, the decay rate of the Langmuir wave increases rapidly as the wavelength decreases. It poses a concern for the BRS, as the plasmon from the forward Raman scattering (FRS), having a lower wave vector than the BRS, depletes the pump. There have been various attempts to suppress the FRS in the visible light regime [15]. The situation is different in metals and the warm dense matters that we consider for the x-ray compression. The interaction of electrons via the inter-band transition (the Umklapp process) [16][17][18][19][20][21][22] becomes the dominant plasmon decay process, in contrast to the Landau damping in an ideal plasma. As a consequence, the decay rate of the long wavelength plasmon * Electronic address: seunghyeonson@gmail.com † Electronic address: sku@cims.nyu.edu ‡ Current address: Citigroup, 388 Greenwich St. New York, NY 10013 is much higher than the prediction of the prevalent dielectric function theory. In this paper, we show that a parameter regime where the BRS is unstable and the FRS is stable does exist in metals and warm dense matters, as the plasmon from the FRS strongly decays. Here, we consider metals in room temperature, and show that an x-ray pulse can be compressed in this regime. We estimate an optima...

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Current-Drive Efficiency in a Degenerate Plasma

Cited by 66 publications

References 18 publications

Plasmon band gap generated by intense ion acoustic waves

Plasmon band gap generated by intense ion acoustic waves

Excitation of ion wakefields by electromagnetic pulses in dense plasmas

Backward Raman compression of x-rays in metals and warm dense matters

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