X-ray spectra of plasma radiation from laser induced low-power vacuum discharge

Romanov, I. V.; Kologrivov, A. A.; Paperny, V. L.; Rupasov, A. A.; Starodub, A. N.

doi:10.1088/1361-6587/aa940e

Cited by 3 publications

(3 citation statements)

References 34 publications

(46 reference statements)

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“…Important characteristics for possible applications of a pulsed SXR source are its stability and timing accuracy. As we showed earlier [16,17], the key condition for achieving this is to ensure such characteristics of the initiating preplasma jet. In this regard, we note that the widespread initiation of a discharge by an auxiliary electric discharge is of a stochastic nature and does not ensure the fulfillment of these conditions.…”

Section: Application Of the Methods And Discussion Of Resultsmentioning

confidence: 89%

“…In this case, the peak radiation power density P on the cathode surface for a 250-mJ pulse achieved 1.5•10 12 W cm −2 . The results of the study of x-ray spectral characteristics of the discharge in this mode are presented in [16]. According to these results, the contribution of the laser plasma emission to the integrated spectrum for the maximum pulse energy J=250 mJ does not exceed 5%, while the contribution of the anode plasma emission to the integrated spectrum can be neglected.…”

Section: Resultsmentioning

confidence: 95%

“…This result suggests the possibility of creating a point source of intense SXR with relatively low power consumption based on a compact laser vacuum discharge. X-ray spectral studies of such a discharge in the spectral range from 30 to 300 Å showed that the micropinch parameters and the SXR generation efficiency are controlled by both the laser pulse parameters determining the mass of the cathode plasma-forming material evaporated and the discharge current determining the plasma pinching rate [15,16]. It was also shown that an increase in the discharge current and the laser pulse energy in the sharp focusing mode of the laser beam on the cathode in the studied energy ranges practically does not change the plasma temperature in the micropinch.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the possibility for increasing the emission of soft x-rays from the plasma of a low-energy vacuum discharge triggered by a laser

Romanov

Tsygvintsev

Kologrivov

et al. 2019

Plasma Phys. Control. Fusion

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The spectral parameters of x-ray radiation in the wavelength range from 25 to 450 Å emitted by plasma of a vacuum discharge with a storage energy 45 J, induced on the Fe cathode by radiation from a neodymium laser with a power density up to 5•10 12 W cm −2 , are studied. On the basis of the collisional-radiative equilibrium model, a method was developed to produce a sufficiently accurate approximation of the experimental spectrum by a linear combination of the calculated spectra of plasma components with a given electron temperature and density. It was shown that the main part (>80%) of the radiation energy in the experimental spectra is provided by relatively cold peripheral plasma with a temperature of no more than 10 eV and a density of 5•10 17 cm −3 . It was established experimentally that a decrease in the laser power density due to the defocusing of the laser beam leads to an increase in the intensity of plasma radiation in the entire spectral range and a change in the spectral structure in the shortwave range. According to simulations, these changes are caused by an increase in the temperature and density of the micropinch formed in the discharge plasma up to 160 eV and 3•10 21 cm −3 , respectively.

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Section: Application Of the Methods And Discussion Of Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the possibility for increasing the emission of soft x-rays from the plasma of a low-energy vacuum discharge triggered by a laser

Romanov

Tsygvintsev

Kologrivov

et al. 2019

Plasma Phys. Control. Fusion

Self Cite

View full text Add to dashboard Cite

show abstract

Influence of the laser plasma-expansion specific on a cathode jet formation and the current stability in a laser-ignited vacuum discharge

et al. 2018

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The formation of a current-plasma shell is studied during the expansion of a laser-ignited low-power vacuum-discharge cathode plasma jet into the interelectrode gap. The shell geometry is found to be determined by the mode of laser-plasma expansion at the discharge ignition stage. It is shown that the increase in the laser-beam focal spot area on the cathode surface leads to the increase in the matter density and the decrease in the density gradient in the discharge gap and to transition from the spherical laser-plasma expansion mode to the jet mode. The latter considerably stabilizes the current transfer in the discharge plasma, even during the development of the hydrodynamic sausage instability in it.

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Emission of anomalously hard x-ray radiation by a target upon exposition with an electron beam, ejected by a low-energy vacuum discharge with laser ignition

et al. 2022

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The characteristics of x-ray radiation of a target that is bombarded by a beam of accelerated electrons ejected by a low-power vacuum discharge with laser ignition are studied. It is shown that the maximum radiation energy exceeds the applied potential difference across the discharge gap by almost an order of magnitude and is inversely proportional to the mass of the cathode material ablated by laser radiation. The energy spectrum of x-ray radiation reconstructed from the radiation attenuation curve by filters-absorbers of various thicknesses showed that in the maximum acceleration mode the average energy of the main part of the spectrum is more than four times higher than the voltage across the discharge gap at the moment of beam emission. Possible mechanisms providing anomalous acceleration of electrons in the discharge are considered.

show abstract

X-ray spectra of plasma radiation from laser induced low-power vacuum discharge

Cited by 3 publications

References 34 publications

Study of the possibility for increasing the emission of soft x-rays from the plasma of a low-energy vacuum discharge triggered by a laser

Study of the possibility for increasing the emission of soft x-rays from the plasma of a low-energy vacuum discharge triggered by a laser

Influence of the laser plasma-expansion specific on a cathode jet formation and the current stability in a laser-ignited vacuum discharge

Emission of anomalously hard x-ray radiation by a target upon exposition with an electron beam, ejected by a low-energy vacuum discharge with laser ignition

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