Bremsstrahlung soft X-ray emission from clusters heated by a Gaussian laser beam

AbstractA theoretical model of soft X-ray emission from laser irradiated clusters is developed. An intense short pulse laser of Gaussian radial and temporal profiles impinged on a clustered gas jet, heats the cluster electrons, leading to Bremsstrahlung emission of X-rays. As the clusters expand under hydrodynamic pressure, plasma frequency of the cluster electrons ωpedecreases. When plasma frequency of a cluster approaches plasma resonance${\rm \omega}_{\,pe} = \sqrt{3} {\rm \omega}$(where ω is the laser frequency), the electrons are resonantly heated by the laser and a rapid rise in X-ray emission occurs. After a while, when cluster expansion detunes the plasma resonance, X-ray emission falls off.

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Numerical studies on the properties of femtosecond laser plasma Kα sources

Laser and Particle Beams ◽

10.1017/s0263034601191238 ◽

2001 ◽

Vol 19 (1) ◽

pp. 147-150 ◽

Cited By ~ 8

Author(s):

CH. REICH ◽

P. GIBBON ◽

I. USCHMANN ◽

E. FÖRSTER

Keyword(s):

Short Pulse ◽

Numerical Models ◽

X Rays ◽

Hot Electron ◽

X Ray ◽

Compact Source ◽

Electron Generation ◽

Short Pulse Laser ◽

Numerical Studies ◽

Femtosecond Laser Plasma

One of the features of ultra high intensity (UHI) short pulse laser–matter interactions is the prospect of creating a cheap, compact source of hard X rays with femtosecond pulse duration. The properties of such Kα sources are studied using analytical and numerical models of hot electron generation and subsequent transport in a range of materials (Reich et al., 2000). First, we find that there is an optimum laser intensity for Kα generation from bulk targets, which scales as Z4.4. Second, we show that efficient hard X-ray pulses with durations below 100 fs can be generated at intensities of ∼1016 W/cm2.

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Laser Larmor X-ray radiation from low-Z matter

Laser and Particle Beams ◽

10.1017/s0263034699171040 ◽

1999 ◽

Vol 17 (1) ◽

pp. 45-58 ◽

Cited By ~ 43

Author(s):

YUTAKA UESHIMA ◽

YASUAKI KISHIMOTO ◽

AKIRA SASAKI ◽

TOSHIKI TAJIMA

Keyword(s):

Energy Spectrum ◽

Laser Pulse ◽

Electromagnetic Fields ◽

Short Pulse ◽

Intense Laser ◽

X Rays ◽

Bremsstrahlung Radiation ◽

Pulse Laser Irradiation ◽

X Ray ◽

Short Pulse Laser

A relativistically intense short laser pulse can produce a large flux of X rays through the interaction with electrons that are driven by its intense electromagnetic fields. Apart from X rays from the high-Z matter irradiation by an intense laser, two main processes, Larmor and Bremsstrahlung radiation, are among the most significant mechanisms for X-ray emission from short-pulse laser irradiation on low-Z matter in the regime of relativistic intensities. We evaluate the power, energy spectrum, brilliance, polarization, and time structure of these X rays. We suggest a few methods that significantly enhance the power of Larmor X rays. Because of the peakedness in the energy spectrum of Larmor X rays, Larmor X rays have important applications.

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The study of time dependent, broadband X-ray emission from ultra-short pulse laser produced plasmas

10.1063/1.46939 ◽

1994 ◽

Author(s):

Ronnie Shepherd ◽

Rex Booth ◽

Dwight Price ◽

Rosemary Walling ◽

Richard More ◽

...

Keyword(s):

Pulse Laser ◽

Short Pulse ◽

Time Dependent ◽

X Ray ◽

Short Pulse Laser ◽

Ultra Short Pulse ◽

Ultra Short Pulse Laser

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Short-pulse laser-driven x-ray radiography

High Power Laser Science and Engineering ◽

10.1017/hpl.2016.31 ◽

2016 ◽

Vol 4 ◽

Cited By ~ 12

Author(s):

E. Brambrink ◽

S. Baton ◽

M. Koenig ◽

R. Yurchak ◽

N. Bidaut ◽

...

Keyword(s):

Pulse Laser ◽

Short Pulse ◽

Incident Angle ◽

Laboratory Astrophysics ◽

Signal To Noise ◽

High Quality ◽

X Ray ◽

Short Pulse Laser ◽

Short Pulse Lasers

We have developed a new radiography setup with a short-pulse laser-driven x-ray source. Using a radiography axis perpendicular to both long- and short-pulse lasers allowed optimizing the incident angle of the short-pulse laser on the x-ray source target. The setup has been tested with various x-ray source target materials and different laser wavelengths. Signal to noise ratios are presented as well as achieved spatial resolutions. The high quality of our technique is illustrated on a plasma flow radiograph obtained during a laboratory astrophysics experiment on POLARs.

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