A. P. Melekhov, E. D. Vovchenko, K. A. Ivanov, K. I. Kozlovskii, G. Kh. Salakhutdinov, I. G. Grigor'eva, I. A. Busigina, P. V. Moskvich, “X-ray spectra of a vacuum spark with laser-assisted initiation at the cathode or anode”, Kvantovaya Elektronika, 2025, Volume 55, Number 3,Pages <nobr>171

Laser plasma

X-ray spectra of a vacuum spark with laser-assisted initiation at the cathode or anode

A. P. Melekhov^a, E. D. Vovchenko^a, K. A. Ivanov^bc, K. I. Kozlovskii^a, G. Kh. Salakhutdinov^a, I. G. Grigor'eva^a, I. A. Busigina^d, P. V. Moskvich^d

^a National Engineering Physics Institute "MEPhI", Moscow
^b Lomonosov Moscow State University, Faculty of Physics
^c P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^d Instruments Research Institute

Abstract: We report the results of studying X-ray emission spectra in the energy range 0.2 keV ≤ hν ≤ 20 keV from the plasma of a laser-induced spark discharge with a current of up to 30 kA. The X-ray energy spectra are measured using an absorber method with a set of lithium fluoride LiF(Mg,Ti) thermoluminescence detectors. X-ray measurements by a pin diode are performed as a supplementary diagnostic. It is shown that the X-ray spectra exhibit noticeable differences at different voltage polarities on high-voltage triggering electrode, with intensity and stability being higher across the entire studied range upon initiation at cathodes.

Keywords: soft X-ray spectra, laser-triggered spark discharge, absorber method, thermoluminescence detectors, X-ray quantum energy.

Received: 06.03.2025
Revised: 18.05.2025
Accepted: 28.05.2025