Laser and Particle Beams

Publisher: Cambridge University Press


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    Laser and particle beams (Online)
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Cambridge University Press

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    • Publisher last reviewed on 07/10/2014
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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: An ultra-wideband radiation source based on the exitation of a 64-element array of combined antennas by a generator of bipolar voltage pulses with the length of 1 ns, amplitude of 200 kV and pulse repetition rate of 100 Hz has been designed and studed. The peak power of the voltage pulse was 3.2 GW. The effective potential of the ultra-wideband source radiation reached 4.3 MV.
    Laser and Particle Beams 09/2014; 32(3):413-418.
  • Laser and Particle Beams 06/2014;
  • Laser and Particle Beams 02/2014; 32(01).
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    ABSTRACT: In this paper, we are presenting the microwave emission results of a vircator that emits its radiation lying well-within the microwave range of electromagnetic spectrum viz 4–8 GHz and the energy needed per shot is as low as 25 Joules only. In this reported experiment, the pulse forming line is charged to a voltage of 160 kV and the measured diode voltage is 50 kV in the experiment. The primary energy is nearly 50 Joules only and hence the energy efficiency of the high voltage pulse transformer and pulse forming line combination for the given experiment is nearly 50%. The experiment is the first of its kind in establishing (experimentally) the low voltage operation of a conventional vircator, which has a planar cylindrical cathode and stainless steel mesh anode, for the microwave emission purpose. Moreover, because of the low voltage and low energy operation we could operate the whole system in repetitive mode and we could achieve as high as 4 Hz operation with this device. Interestingly, the current density of the velvet cathode used in the present experiment is nearly 300 A/cm2 in the present reported set of experiments. One interesting observation emerging out from the present experiment is that in the low voltage operation of the vircator the beam acceleration potential is relatively low and hence the axial velocities of reflexing electrons (trapped between cathode and virtual cathode) is also limited and far less than 1.8 × 108 m/s and hence with small anode cathode gaps like that of 3 mm, which is the case of present experiments, it becomes feasible to achieve radiation frequency of 4–8 GHz from the vircator.
    Laser and Particle Beams 12/2013; 31(4):627-634.
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    ABSTRACT: A new inverse Compton scattering scheme for production of high-energy Gamma-ray sources is proposed in which a Giga-electronvolt (GeV) electron beam is injected into a thermal hohlraum. It is found that by increasing the hohlraum background temperature, the scattered photons experience kinematic pileup, resulting in more monochromatic spectrum and smaller scattering angle. When a relativistic electron beam with energy 1 GeV and charge 10nC is injected into a 0.5 keV hohlraum, 80% of the scattered photons have energy above 0.5 GeV.
    Laser and Particle Beams 12/2013; 31(04).
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    ABSTRACT: In this paper, we extend our previous work of classical over barrier ionization (COBI) model to study the multiple-ionization and mean charge state of noble gases colliding with heavy ions at energies close to the Bragg peak region ranging up to some hundreds of keV/amu. The method we report is in good agreement with experimental data and offers the advantage of very small computation time. Therefore, this model will be extremely helpful to be included in numerical codes to calculate the charge state distribution in plasma.
    Laser and Particle Beams 12/2013; 31(04).
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    ABSTRACT: A flyer with high velocity and good integrity can be obtained by laser driven multi-layered film. In order to deeply study the action mechanism, a calculation model of laser driven multi-layered flyer has been established, taking into account the effect of multi-layered on flyer velocity increase. Multi-layered flyer velocity driven by laser pulse beam has been calculated to decide film configuration capable of forming a high velocity flyer. Taking this film configuration as object, an intense laser driven multi-layered flyer experiment has been conducted to obtain flyer velocity and verify calculation model. In order to analyze flyer motion details, a two-dimensional axisymmetric computation model of laser driven flyer has been established. In this study, laser energy spatial-temporal distribution, film ablation, and plasma absorption laser to drive flyer have been considered. Saha ionization equilibrium equation is adopted to calculate film ionization degree and give plasma state equation. Dynamic mesh algorithm is used to calculate flyer motion. Coupled numerical simulation of laser ablation, laser interaction with plasma and plasma driven flyer has been achieved. Results show that flyer velocity firstly increases and then decreases with the increase of ablation layer thickness. Ablation layer has an optical laser absorption depth for different layer materials. Plasma velocity distribution is linear in axial when flyer accelerates. Insulation layer can decrease flyer temperature effectively to keep flyer integrity.
    Laser and Particle Beams 12/2013; 31(04).
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    ABSTRACT: A new two-step approach for frequency conversion of laser radiation towards hard X-rays is developed and examined experimentally. Fast electrons are produced in a form of thin jets at the first stage, as an intense femtosecond laser pulses impinges on a micrometer water target. In the second stage the accelerated electrons hit a secondary metal target and generate characteristic K-shell radiation with a duration down to sub-femtosecond. It is shown that counter propagating laser radiation experiences very strong up-shift with up to 6 × 103 times of fundamental frequency by reflection from the electron jets.
    Laser and Particle Beams 12/2013; 31(04).
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    ABSTRACT: The results of the experimental studies of the high-power e-beam accelerator producing six radially convergent electron beams are presented. The studies are aimed to increase the energy of the electron beam transported through the foil into the gas-filled chamber by using the rod-shaped current returns in the diode at small inter-electrode gaps. Installation of these rod current returns shields the periphery regions of the diode from the current field in the central part thus reducing the field at the diode edge. The inter-electrode distance, the shape, and the sizes of the cathodes are chosen by taking into account the magnetic field reduction in the diode. It is shown that in such type of the diode the electrons impact the foil almost normally to its surface, and the electron beams enter the output windows completely. Such type of the diode allows increasing the efficiency of the electron beam energy transfer into the gas by 30%.
    Laser and Particle Beams 12/2013; 31(04).
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    ABSTRACT: High speed framing camera (HSFC) could be used to capture the image of the electron beams generated by the intense electron-beam accelerator (IEBA), and it is useful to visualize the evolution of discharging and plasma generation phenomenon. So an overview of the application of HSFC on the IEBA is presented. First, we introduce the synchronization problem of HSFC and IEBA, and a synchronization trigger system which could provide a trigger signal with rise time of 17 ns and amplitude of about 5 V is presented. Second, an imaging system based on IEBA, HSFC, and the synchronization trigger system is developed, and it can be used to image the developmental process of plasma in the output vacuum chamber of IEBA and to measure the electrical parameter of IEBA and electrical trigger signal in real time. Furthermore, the imaging system is used to investigate the developmental process of the electron beam of the A-K gap in vacuum under 180 nanosecond quasi-square pulses. It is obtained that the short A-K gap is closed prematurely under long pulse operation with plasma expansion velocity of about 6.25 cm/µs and the light emission in the A-K gap region has the characteristics of “re-ignition” with light duration time about 3800 ns. At last, the discharging process of surface flashover channel of poly-methyl methacrylate (PMMA) insulator with gap spacing of 170 mm in vacuum under nanosecond quasi-square pulses is studied by the imaging system, and the change of luminosity is analyzed during the surface flashover process.
    Laser and Particle Beams 12/2013; 31(04).
  • [Show abstract] [Hide abstract]
    ABSTRACT: In the present paper, spatial amplitude modulation instability arising due to relativistic self-phase modulation and relativistic cross phase modulation of two co-propagating, linearly polarized laser beams (with arbitrary relative polarization) interacting with homogeneous plasma, has been studied. Wave equations including finite perturbation length effects, group velocity dispersion, and coupled nonlinear source term have been set up. Coupled dispersion relation for the two laser beams has been derived and solved numerically. The growth rate of modulation instability has been obtained and compared with the growth rate of a single beam propagating in homogeneous plasma. It has been shown that modulation instability of a single beam may either be enhanced or suppressed by co-propagation of another laser beam having appropriate polarization.
    Laser and Particle Beams 12/2013; 31(04).