Bremsstrahlung emission and plasma characterization driven by moderately relativistic laser-plasma interactions

Sushil Kumar Singh, Chris Armstrong, Ning Kang, Lei Ren, Huiya Liu, Neng Hua, Dean R Rusby, Ondrej Klimo, Roberto Versaci, Yan Zhang, Mingying Sun, Baoqiang Zhu, Anle Lei, Xiaoping Ouyang, Livia Lancia, Alejandro Laso Garcia, Andreas Wagner, Thomas E Cowan, Jianqiang Zhu, Theodor SchlegelStefan Weber, Paul McKenna, David Neely, Vladimir Timofeevich Tikhonchuk, Deepak Kumar

Research output: Contribution to journalArticlepeer-review

Abstract

Relativistic electrons generated by the interaction of petawatt-class short laser pulses with solid targets can be used to generate bright X-rays via bremsstrahlung. The efficiency of laser energy transfer into these electrons depends on multiple parameters including focused intensity and pre-plasma level. This paper describes the experimental results from the interaction of a high intensity petawatt-class glass laser with solid targets at a maximum intensity of 10^19 W/cm^2. In-situ measurements of specularly reflected light were used to provide an upper bound of laser absorption and to characterize focused laser intensity, the pre-plasma level and the generation mechanism of second harmonic light. The measured spectrum of electrons and bremsstrahlung radiation provide information about the efficiency of laser energy transfer.
Original languageEnglish
JournalPlasma Physics and Controlled Fusion
Early online date1 Dec 2020
DOIs
Publication statusE-pub ahead of print - 1 Dec 2020

Keywords

  • relativistic electrons
  • petawatt-class short laser pulses
  • solid target
  • bremsstrahlung
  • plasma

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