X-ray spectra of He-like ions of Ga and Ge, excited in the low-inductance spark plasma

Aglitsky, E.V.; Antsiferov, P. S.; Panin, A. M.

doi:10.1016/0030-4018(84)90004-x

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…U nlike in plasm a sources, dielectronic satellite transitions that tend to blend w ith the helium like resonance line, w hich is com m only referred to as line w , are absent. Such satellites are present in tokam ak m easurem ents, but at a reduced level com pared to high-density plasm a sources such as vacuum sparks or laser-produced plasm as, w hich have also been used to m easure the x-ray lines o f helium like ions [16][17][18]. O pacity effects, w hich affect high-density plasm a sources, do not exist in electron beam ion trap plasm as, nor are these m easurem ents affected by relativistic D oppler shifts associated with m any heavy-ion accelerator m easurem ents.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the x-ray transitions in the heliumlike isoelectronic sequence: Updated results

Beiersdörfer

Brown

2015

Phys. Rev. A

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We revisit the discrepancy between experiments and theory for the x-ray transitions of heliumlike ions and report on a measurement of the n = 2 -» n = 1 x-ray transitions of heliumlike Cu27+. These measurements were carried at the Livermore electron beam ion trap facility and achieved an accuracy of 18 ppm. The measured values show reasonable agreement with theory, but they do not follow the trend established by other measurements with similar uncertainties.

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Section: Introductionmentioning

confidence: 99%

Experimental study of the x-ray transitions in the heliumlike isoelectronic sequence: Updated results

Beiersdörfer

Brown

2015

Phys. Rev. A

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“…It is also worth mentioning two important types of microsecond Z-pinches in which, nevertheless, high plasma parameters were achieved (temperatures of several kilovolts and densities of higher than 10 20 cm -3 ). These are the plasma focus, which is being actively studied to date [21,22], and the vacuum spark [23][24][25], which exhibits an interesting and important plasma phenomenon-the so-called hot spot (HS). The formation of an HS in a microsecond discharge is associated with nanosecond-scale plasma processes.…”

mentioning

confidence: 99%

X-pinch. Part I

2015

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Results of experimental studies of the Х-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The concept of the Х-pinch arose in the course of innovative experiments on studying the generation of hot dense plasma in nanosecond Z-pinches. The main idea was to localize the region occupied by the plasma and stabilize the moment of its formation. This was achieved by using a load in the form of crossed wires. The resulting plasma object turned out to be so interesting that a new scientific direction appeared in plasma physics. At present, studies in this direction are being performed in many laboratories worldwide. The term Х-pinch became conventional, and sections devoted to its study are always present at plasma conferences. Х-pinch is not only a very interesting scientific object, but also a unique source of X-ray emission with extreme parameters. The use of Х-pinches for point-projection X-ray radiography of high-energy-density objects provided many new experimental results. In some cases, the concepts of the processes occurring in matter upon fast energy deposition changed dramatically. The review consists of two parts. The first part briefly outlines the history of creation and studies of Х-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the Х-pinch. The second part is devoted to the results of detailed studies of the Х-pinch hot spot-the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of Х-pinch simulations are also presented.

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“…The simulated spectrum was not shifted because of the high accuracy of the FLYCHK calculated energy of the Ga He-like 1s 2 1 S 0 – 1s2p 1 P 1 resonance transition (labeled w in Fig. 5), 9628.4 eV as compared to the previously calculated value 9628.2 eV [15] and the previous experimental value 9627.5 ± 0.7 eV [16].…”

Section: Ga He-like and Li-like Spectrum Analysismentioning

confidence: 54%

Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios

Seely¹,

Fein

Manuel

et al. 2018

High Energy Density Physics

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The properties of hot, dense plasmas generated by the irradiation of GaAs targets by the Titan laser at Lawrence Livermore National Laboratory were determined by the analysis of high resolution K shell spectra in the 9 keV to 11 keV range. The laser parameters, such as relatively long pulse duration and large focal spot, were chosen to produce a steady-state plasma with minimal edge gradients, and the time-integrated spectra were compared to non-LTE steady state spectrum simulations using the FLYCHK and NOMAD codes. The bulk plasma streaming velocity was measured from the energy shifts of the Ga He-like transitions and Li-like dielectronic satellites. The electron density and the electron energy distribution, both the thermal and the hot non-thermal components, were determined from the spectral line ratios. After accounting for the spectral line broadening contributions, the plasma turbulent motion was measured from the residual line widths. The ionization balance was determined from the ratios of the He-like through F-like spectral features. The detailed comparison of the experimental Ga spectrum and the spectrum simulated by the FLYCHK code indicates two significant discrepancies, the transition energy of a Li-like dielectronic satellite (designated t) and the calculated intensity of a He-like line (x), that should lead to improvements in the kinetics codes used to simulate the X-ray spectra from highly-charged ions.

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X-ray spectra of He-like ions of Ga and Ge, excited in the low-inductance spark plasma

Cited by 9 publications

References 5 publications

Experimental study of the x-ray transitions in the heliumlike isoelectronic sequence: Updated results

Experimental study of the x-ray transitions in the heliumlike isoelectronic sequence: Updated results

X-pinch. Part I

Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios

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