Studying the magnetic properties of CoSi single crystals

Narozhnyi, V. N.; Krasnorussky, V. N.

doi:10.1134/s106377611305021x

Cited by 29 publications

(39 citation statements)

References 10 publications

(17 reference statements)

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“…As a consequence the scattered radiation is chirped and it's spectral lines become much broader, with a number of subsidiary peaks [29,47]. This phenomenon is denoted as ponderomotive broadening [33,[48][49][50].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…, that oscillates with the frequency ω of the carrier wave, and that averages to zero, π µ osc (x + ) = 0, within the slowly varying envelope approximation [49].…”

Section: Separation Of Slow and Fast Time Scales And Higher Harmonicsmentioning

confidence: 99%

“…assuming that g and ω are approximately constant over the averaging window of one period of the carrier wave [49]. The averaged electron kinetic four-momentum (i.e.…”

Section: Separation Of Slow and Fast Time Scales And Higher Harmonicsmentioning

confidence: 99%

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Narrowband inverse Compton scattering x-ray sources at high laser intensities

et al. 2015

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Narrowband x-and gamma-ray sources based on the inverse Compton scattering of laser pulses suffer from a limitation of the allowed laser intensity due to the onset of nonlinear effects that increase their bandwidth. It has been suggested that laser pulses with a suitable frequency modulation could compensate this ponderomotive broadening and reduce the bandwidth of the spectral lines, which would allow to operate narrowband Compton sources in the high-intensity regime. In this paper we, therefore, present the theory of nonlinear Compton scattering in a frequency modulated intense laser pulse. We systematically derive the optimal frequency modulation of the laser pulse from the scattering matrix element of nonlinear Compton scattering, taking into account the electron spin and recoil. We show that, for some particular scattering angle, an optimized frequency modulation completely cancels the ponderomotive broadening for all harmonics of the backscattered light. We also explore how sensitive this compensation depends on the electron beam energy spread and emittance, as well as the laser focusing.

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Section: Theoretical Backgroundmentioning

confidence: 99%

“…, that oscillates with the frequency ω of the carrier wave, and that averages to zero, π µ osc (x + ) = 0, within the slowly varying envelope approximation [49].…”

Section: Separation Of Slow and Fast Time Scales And Higher Harmonicsmentioning

confidence: 99%

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Narrowband inverse Compton scattering x-ray sources at high laser intensities

et al. 2015

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“…Revisiting the results on multiphoton Compton and BreitWheeler processes [5,6,11], we find that there is indeed a parameter range, for which the depletion of the laser becomes substantial. The processes in question have recently received a lot of interest [12,13], albeit with a focus on the final states (a frequency shifted photon or electron positron pairs).In this Letter, we want to change perspective and study in detail the dependence of nonlinear Compton scattering on the initial multiphoton states, that is on the number of laser photons absorbed. This will allow us to establish a threshold for the validity of the external field approximation and discuss some immediate consequences.…”

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confidence: 99%

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confidence: 99%

Depletion of intense fields

Bulanov¹,

Seipt²,

Heinzl³

et al. 2017

AIP Conference Proceedings

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The interaction of charged particles and photons with intense electromagnetic fields gives rise to multiphoton Compton and Breit-Wheeler processes. These are usually described in the framework of the external field approximation, where the electromagnetic field is assumed to have infinite energy. However, the multiphoton nature of these processes implies the absorption of a significant number of photons, which scales as the external field amplitude cubed. As a result, the interaction of a highly charged electron bunch with an intense laser pulse can lead to significant depletion of the laser pulse energy, thus rendering the external field approximation invalid. We provide relevant estimates for this depletion and find it to become important in the interaction between fields of amplitude a 0 ∼ 10 3 and electron bunches with charges of the order of 10 nC. DOI: 10.1103/PhysRevLett.118.154803 The interaction of charged particles with ultraintense electromagnetic (EM) pulses is the cornerstone of a newly emerging area of research, high intensity particle physics, located at the intersection of quantum electrodynamics (QED) and the theory of strong EM background fields. The latter significantly alter the physics of typical QED processes, leading to effects not encountered in perturbative quantum field theory [1][2][3][4][5][6]. Recently, there has been a surge of interest in these processes due to the planning and realization of new laser facilities, which will be able to deliver EM pulses of unprecedented intensities to test the predictions of high intensity particle physics [2]. Moreover, the development of compact multi-GeV laser electron accelerators [1,2,7,8] adds another component necessary to carry out these studies.Here, we will assume that the strong EM field is provided by an ultraintense laser (pulse) with wave vector k, central frequency ω ¼ 2π=λ in the optical regime, and electric field magnitude E. The interactions of this strong field with photons and charged particles are parametrized in terms of the following parameters (we use natural units throughout, Here, e and m are electron charge and mass, F μν is the EM field tensor, while p ν and k 0 ν denote the four momenta of electron and photon probing the laser. The parameter a 0 is usually referred to as the classical nonlinearity parameter, since its physical meaning is the energy gain of an electron (in units m) traversing a reduced wavelength ƛ ¼ 1=ω of the field. For a 0 > 1 the electron or positron motion in such a field becomes relativistic.The parameter E S characterizes a distinct feature of QED, the ability to produce new particles from vacuum. This happens when an energy of mc 2 is delivered across an electron Compton wavelength ƛ e ¼ 1=m, which is precisely achieved by E S [10]. The parameters χ e and χ γ characterize the interaction of charged particles and photons with the strong EM field. For example, χ e is the EM field strength in the electron rest frame in units of E S . Quantum effects become of crucial importance when E ≈ E S or χ ...

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Silicide Thermoelectrics

Бурков

Ivanov

2019

Advanced Thermoelectric Materials

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Studying the magnetic properties of CoSi single crystals

Cited by 29 publications

References 10 publications

Narrowband inverse Compton scattering x-ray sources at high laser intensities

Narrowband inverse Compton scattering x-ray sources at high laser intensities

Depletion of intense fields

Silicide Thermoelectrics

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