Review of fully coherent free-electron lasers

Feng, Chao; Deng, Haixiao

doi:10.1007/s41365-018-0490-1

Cited by 123 publications

(72 citation statements)

References 100 publications

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“…Radiation can also be emitted by currents that are induced by free electrons in polarizable structures and materials, such as in Cerenkov radiation [62,63], transition radiation [29][30][31][32][33][34]214] and Smith-Purcell radiation [58][59][60][61]. Of most current interest nowadays are Free Electron lasers (FEL), a most potent intense coherent radiation source that can operate in a wide range of radiation wavelengths from microwaves to X-Rays (see recent review in this journal [1,2,228]).…”

Section: Introductionmentioning

confidence: 99%

Superradiant and stimulated-superradiant emission of bunched electron beams

et al. 2019

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We outline the fundamental coherent radiation emission processes from a bunched charged particles beam. In contrast to spontaneous emission of radiation from a random electron beam that is proportional to the number of particles, a pre-bunched electron beam can emit spontaneously coherent radiation proportional to the number of particles -squared, through the process of (spontaneous) superradiance (SP-SR) (in the sense of Dicke's). The coherent SP-SR emission of a bunched electron beam can be even further enhanced by a process of stimulated-superradiance (ST-SR) in the presence of a seed injected radiation field. In this review, these coherent radiation emission processes for both single bunch and periodically bunched beams are considered in a model of radiation mode expansion.We also analyze here the SP-SR and ST-SR processes in the nonlinear regime, in the context of enhanced undulator radiation from a uniform undulator (wiggler) and in the case of wiggler Tapering-Enhanced Stimulated Superradiant Amplification (TESSA).The processes of SP-SR and TESSA take place also in tapered wiggler seed-injected FELs. In such FELs, operating in the X-Ray regime, these processes are convoluted with other effects. However these fundamental emission concepts are useful guidelines in efficiency enhancement strategy of wiggler tapering. Based on this model we review previous works on coherent radiation sources based on SP-SR (coherent undulator radiation, synchrotron radiation, Smith-Purcell radiation etc.), primarily in the THz regime and on-going works on tapered wiggler efficiency-enhancement concepts in various frequency regimes.

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Section: Introductionmentioning

confidence: 99%

Superradiant and stimulated-superradiant emission of bunched electron beams

et al. 2019

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“…To understand the isospin dynamics in the medium and high energy heavy-ion collisions, the LQMD transport model is developed on the issues of symmetry energy at subnormal and suprasaturation densities, in-medium nucleon-nucleon (NN) cross sections, isospin and momentum dependent NN potential, isospin effects on particle production and transportation etc [17][18][19][20]. All possible reaction channels of the charge-exchange, elastic and inelastic scatterings by distinguishing isospin effects in hadron-hadron collisions were implemented in the model.…”

Section: Brief Description Of the Lqmd Modelmentioning

confidence: 99%

Isospin effect in peripheral heavy-ion collisions at Fermi energies

Guo¹,

Chen²,

Niu³

et al. 2018

Chinese Phys. C

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Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, the isospin effect in peripheral heavy-ion collisions has been investigated thoroughly. A coalescence approach is used for recognizing the primary fragments formed in nucleus-nucleus collisions. The secondary decay process of the fragments is described by the statistical code, GEMINI. Production mechanism and isospin effect of the projectile-like and target-like fragments are analyzed with the combined approach. It is found that the isospin migration from the high-isospin density to the low-density matter takes place in the neutron-rich nuclear reactions, i.e., Xe. A hard symmetry energy is available for creating the neutron-rich fragments, in particular in the medium-mass region. The isospin effect of the neutron to proton (n/p) ratio of the complex fragments is reduced once including the secondary decay process. However, a soft symmetry energy enhances the n/p ratio of the light particles, in particular at the kinetic energies above 15 MeV/nucleon. PACS number(s): 21.65. Ef, 24.10.Lx,

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“…Heavy-ion collisions in terrestrial laboratory provide a unique possibility to create the dense hadronic matter, which are available for investigating the in-medium properties of hadrons and nuclear equation of state [1][2][3][4][5]. Particle production at energies below the threshold for its creation in nucleon-nucleon collisions can be probe to study the high-density hadronic matter properties, i.e., the chiral symmetry restoration, phase-transition from quark-gluon plasma to hadrons, hadron-nucleon interaction, nuclear equation of state etc [6][7][8][9][10]. A number of experiments for the subthreshold production of pions, kaons, antikaons and antiprotons in heavy-ion collisions were performed and precise spectra have been measured [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Antiproton production in heavy-ion collisions at subthreshold energies *

Zhu¹

2020

Chinese Phys. C

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Within the framework of the Lanzhou quantum molecular dynamics model, the deep subthreshold antiproton production in heavy-ion collisions has been investigated thoroughly. The elastic scattering, annihilation and charge exchange reactions associated with antiproton channels are implemented in the model. The attractive antiproton potential extracted from the G-parity transformation of the nucleon selfenergies enhance the antiproton yields to some extent. The calculated invariant spectra are consistent with the available experimental data. The primordial antiproton yields increase with the mass number of colliding system. However, the annihilation reactions reduce the antiproton production and enable independent to colliding partners. Antiflow phenomena of antiprotons correlated to the mean-field potential and annihilation mechanism is found in comparison with proton flows.PACS number(s): 25.75. Dw, 25.43.+t, 25.75.Ld

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Review of fully coherent free-electron lasers

Cited by 123 publications

References 100 publications

Superradiant and stimulated-superradiant emission of bunched electron beams

Superradiant and stimulated-superradiant emission of bunched electron beams

Isospin effect in peripheral heavy-ion collisions at Fermi energies

Antiproton production in heavy-ion collisions at subthreshold energies *

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