Pulsed laser-plasma gamma radiation source for radiography

We have performed experiments on the generation of relativistic electron beams in helium gas jets (electron density ∼1020 cm−3) using a femtosecond Ti : sapphire laser. Electron beams with a total charge of 0.2−0.5 nC, a maximum electron energy of up to 60 MeV, and a divergence of up to 300 mrad are...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2021-10, Vol.51 (10), p.866-872
Main Authors: Flegentov, V.A., Safronov, K.V., Gorokhov, S.A., Tishchenko, A.S., Kovaleva, S.F., Potapov, A.V., Pavlenko, A.V.
Format: Article
Language:English
Subjects:
Bremsstrahlung
bremsstrahlung X-ray radiation
dense gas jets
Electron density
Electron energy
Electrons
Femtosecond pulsed lasers
Gamma rays
Gas jets
Laser beams
laser-plasma acceleration
Pulsed lasers
Radiation
Radiation dosage
radiography
Relativistic electron beams
relativistic electrons
Sapphire
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Summary:We have performed experiments on the generation of relativistic electron beams in helium gas jets (electron density ∼1020 cm−3) using a femtosecond Ti : sapphire laser. Electron beams with a total charge of 0.2−0.5 nC, a maximum electron energy of up to 60 MeV, and a divergence of up to 300 mrad are recorded. The generated electron beams are converted into bremsstrahlung X-rays using a Ta plate 2 mm thick. The average dose of bremsstrahlung radiation in the air at a distance of 1 m from the source was 5.4 ±1.7 mrad per pulse. The emitting region size measured by the blurriness of the X-ray image is about 650 μm (FWHM).
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL17621