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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1531-1538 
    ISSN: 0392-6737
    Keywords: Waves, oscillations, and instabilities in plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A large-amplitude beat wave excited at the beat frequency of two copropagating laser beams is extremely unstable and suffers strong three- and fourwave parametric instabilities with large growth rates. The relativistic effects are seen to be negligible on both the decay and modulation instabilities. However, the growth rates of these instabilities are sensitive functions of the plasma parameters.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 863-872 
    ISSN: 0392-6737
    Keywords: Electromagnetic wave propagation in plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Questo articolo presenta uno studio teorico dello scattering stimolato di Brillouin di un fascio di radiazione elettromagnetica, in una guida d’onda rettangolare riempita con un semiconduttore. L’onda elettromagnetica incidente decade parametricamente in un’onda elettrostatica a bassa frequenza di ioni e in una banda laterale elettromagnetica diffusa. Per parametri tipici del plasma in una guida d’onda rettangolare riempita conn-InSb e quando la velocità di deriva degli elettroni indotta dalla pompa,v 0, è confrontabile con la velocità ionicaC s inn-InSb (cioè |v 0/C s |≅1), la velocità di crescita delle onde di decadimento risulta di ∼103 rad s−1 per una microonda di 3 cm e ∼107 rad s−1 per una radiazione di laser a CO2. La velocità di crescita dell’instabilità si annulla agli estremi delle guide d’onda.
    Abstract: Резюме Эта статья представляет теоретическое исследование стимулированного бриллюэновского рассеяния пучка электромагнитного излучения в полупроводнике, заполняющем прямоугольный волновод. Падающая электромагнитная волна распадается параметрически на низкочастотную электростатическую ионную акустическую волну и рассеянную электромагнитную побочную полосу. Для типичных плазменных параметров вn-InSb, заполняющем прямоугольный волновод, и когда насос индуцирует дрейфовую скорость электронов,v 0, сравнимую с ионной акустической скоростью,C s , вn-InSb (т.е. |v 0/C s |≅1), интенсивность образования распадных волн составляет ∼103 рал c−1 для 3 см микроволнового излучения и ∼107 рад c−1 для излучения CO2 лазера. Интенсивность образования неустойчивости обращается нуль на границе волновода.
    Notes: Summary This paper presents a theoretical investigation of the stimulated Brillouin scattering of a beam of electromagnetic radiation in a semiconductor-filled rectangular waveguide. The incident electromagnetic wave decays parametrically into a low-frequency electrostatic ion acoustic wave and a scattered electromagnetic sideband. For typical plasma parameters in an-InSb-filled rectangular waveguide and when the pump-induced drift velocity of electrons,v 0, is comparable to the ion acoustic velocity,C s , inn-InSb (i.e. |v 0/C s |≅1), the growth rate of the decay waves turns out to be ∼103 rad s−1 for a 3 cm microwave and ∼107 rad s−1 for a CO2 laser radiation. The growth rate of the instability vanishes at the boundary of the waveguide.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 293-302 
    ISSN: 0392-6737
    Keywords: Laser-plasma interactions (e.g. anomalous absorption, backscattering, magnetic field generation, fast particle generation ; Electromagnetic wave propagation in plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro la generazione della seconda armonica relativistica di una radiazione laser ad alta potenza in un plasma prodotto da laser è stata studiata teoricamente in presenza di un campo magnetico autogenerante. È stata usata l'equazione di Vlasov relativistica per la risposta non lineare degli elettroni nel plasma magnetizzato caldo. Si osserva che l'efficienza di conversione di potenza della seconda onda armonica generata è molto piú alta per i calcoli relativistici di quella per i calcoli non relativistici.
    Abstract: Резюме В этой статье теоретически исследуется релятивистское образование второй гармоники лазерого излучения высокой мощности в плазме, образованной лазером, в присутствии самообразованного магнитного поля. Используется релятивистское уравнение Власова для нелинейного отклика электронов в горячей намагниченной плазме. Отмечается, что эффективность преобразования мощности для образованной второй гармоники оказывается много больше для релятивистских вычислений чем для нерелятивиских вычислений.
    Notes: Summary In this paper the relativistic second-harmonic generation of a high-power laser radiation in a laser-produced plasma has been studied theoretically in the presence of a self-generated magnetic field. The relativistic Vlasov equation has been employed for the nonlinear response of the electrons in the hot magnetized plasma. It is observed that the power conversion efficiency of the generated second harmonic wave is much higher for relativistic calculations than that for nonrelativistic calculations.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 987-998 
    ISSN: 0392-6737
    Keywords: Nonlinear waves and nonlinear interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In questo lavoro è stata studiata l’interazione non lineare di un fascio gaussiano elettromagnetico con un’onda elettrostatica superiore ibrida in un plasma magnetizzato senza collisione. Per quanto riguarda l’interazione del fascio elettromagnetico gaussiano incidente, una componente dipendente del tempo della forza ponderomotrice diventa finita e porta alla modifica nella densità di fondo. Questo dà luogo all’eccitazione del modo ibrido superiore del plasma. L’onda elettrostatica eccitata porta a un accrescimento dello scattering di Raman all’indietro. Si deduce un’espressione per la potenza diffusa e si discute l’effetto del campo magnetico statico esterno sull’aumento della perturbazione di densità e della potenza diffusa.
    Notes: Summary In this paper we have studied the nonlinear interaction of a Gaussian electromagnetic beam with an electrostatic upper hybrid wave in a collisionless magnetized plasma. On account of the interaction of the incident Gaussian electromagnetic beam with the plasma, a time-independent component of the ponderomotive force becomes finite and leads to the modification in the background density. This results in the excitation of the upper hybrid mode of the plasma. The excited electrostatic wave leads to the enhanced Raman backscattering. An expression for the scattered power is derived and the effect of the external static magnetic field on the enhancement of the density perturbation and scattered power is discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1079-1092 
    ISSN: 0392-6737
    Keywords: Plasma interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è effettuata una ricerca teorica dell'eccitazione relativistica nonlineare dell'onda longitudinale del plasma dell'elettrone ad una frequenza di battimento di due raggi laser colineari in un plasma omogeneo, caldo e senza collisioni, in presenza di un campo magnetico esterno. È stata risolta l'equazione di Vlasov relativistica per ottenere la risposta nonlineare di elettroni magnetizzati. Si osserva che l'efficacia di conversione di potenza dell'onda di plasma degli elettroni eccitati alla frequenza di differenza è molto superiore per il calcolo relativistico che quella per i calcoli non relativistici. Si nota inoltre che l'efficacia di conversione di potenza dell'eccitazione d'onda di battimento aumenta lentamente con il campo magnetico esterno quando i raggi laser colineari si propagano trasversalmente rispetto alla direzione del campo magnetico esterno, mentre rimane quasi immutata quando le onde incidenti si propagano parallelamente alla direzione del campo magnetico.
    Abstract: Резюме Проводится теоретическое исследование нелинейного релятивистского возбуждения продольных электронных плазменных волн на частоте биений двух соосных лазерных пучков в торячей, бесстолкновительной и однородной плазме в присутствии внешнего магнитного поля. Чтобы получить нелинейный отклик электронов в магнитном поле, решается релятивистское уравнение Власова. Получается, что эффективность конверсии мощности для возбужденной электронной плазменной волны на разностной частоте оказывается много большей для релятивистских вычислений, чем для нерелятивистских вычислений. Затем отмечается, что эффективность возбуждения биений увеличивается медленно с ростом внешнего магнитного поля, когда соосные лазерные пучки распространяются поперек направления внешнего магнитного поля, тогда как эффективность возбуждения почти не изменяется, когда падающие волны распространяются параллельно направлению магнитного поля.
    Notes: Summary A theoretical investigation of the nonlinear relativistic excitation of the longitudinal electron plasma wave at the beat frequency of two colinear laser beams has been made in a hot, collisionless and homogeneous plasma in the presence of an external magnetic field. The relativistic Vlasov equation has been solved to obtain the nonlinear response of magnetized electrons. It is observed that the power conversion efficiency of the excited-electron plasma wave at the difference frequency is much higher for the relativistic calculation than that for the nonrelativistic calculations. It is further noticed that the power conversion efficiency of the beat wave excitation increases slowly with the external magnetic field when the colinear laser beams propagate transverse to the direction of the external magnetic field, whereas it is almost unaffected when the incident waves propagate parallel to the direction of the magnetic field.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 779-786 
    ISSN: 0392-6737
    Keywords: Waves, oscillations and instabilities in plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A theoretical investigation is made on the nonlinear relativistic excitation of an electrostatic electron plasma wave at the beat frequency of two high-power colinear laser beams in a hot, homogeneous and magnetized plasma. The relativistic Vlasov equation expressed in gyrokinetic variables has been employed to find the nonlinear response of the magnetized plasma electrons. It is noted that the power density associated with the excited beat wave is much higher for the relativistic consideration than that for the nonrelativistic consideration.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 43 (1982), S. 1087-1092 
    ISSN: 0022-3697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B+C 114 (1982), S. 129-134 
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 81 (1981), S. 522-524 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 91 (1982), S. 125-128 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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