A Study of Coherent Radiation Generated in an Ablative Capillary Discharge

Feasible soft-X-ray amplification in the CVI and NVII Balmer transition is investigated in a capillary discharge. The best conditions and parameters for the experimental set-up are found for an ablative capillary. The most optimistic results have shown that the gain would be greater than one, which is the condition for successful ASE (Amplified spontaneous emission) in capillary discharges. The capillary discharge evolution is modeled using the NPINCH program, employing a one-dimensional physical model based on MHD equations. The information about the capillary discharge evolution is processed in the FLY, FLYPAPER, FLYSPEC programs, enabling the population to be modeled on specific levels during capillary discharge.

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Capillary Discharge Parameter Assessment for X-ray Laser Pumping

Acta Polytechnica ◽

10.14311/1233 ◽

2010 ◽

Vol 50 (4) ◽

Author(s):

J. Hübner

Keyword(s):

Physical Model ◽

Computer Modelling ◽

Capillary Discharge ◽

Mhd Equations ◽

Discharge Parameter ◽

Discharge Characteristics ◽

One Dimensional ◽

X Ray ◽

Maximum Emission ◽

Laser Pumping

This paper assigns optimum capillary discharge characteristics with respect to reaching the maximum emission gain on wavelength l = 18.2 nm and corresponding to Balmer α transition H-like carbon. The computer modelling of the capillary discharge evolution is carried out using the NPINCH programme, using a one-dimensional physical model based on MHD equations. The information about the capillary discharge evolution is processed in FLY, FLYPAPER, FLYSPEC programmes, enabling the population to be modelled on specific levels during capillary discharge.

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The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed

Laser and Particle Beams ◽

10.1017/s0263034609000500 ◽

2009 ◽

Vol 27 (3) ◽

pp. 393-398 ◽

Cited By ~ 6

Author(s):

H. Huang ◽

G.J. Tallents

Keyword(s):

Spontaneous Emission ◽

Extreme Ultraviolet ◽

Amplified Spontaneous Emission ◽

Gain Saturation ◽

Free Electron Lasers ◽

Laser Amplifier ◽

One Dimensional ◽

X Ray ◽

Laser Amplifiers ◽

Harmonic Radiation

AbstractThe minimum irradiance needed to overcome amplified spontaneous emission (ASE) of a seed beam injected into a laser amplifier is evaluated. The treatment is particularly applicable to extreme ultraviolet (EUV) and X-ray laser schemes to inject laser harmonic radiation as a seed into (1) plasma laser amplifiers and (2) free-electron lasers. Simple expressions and calculations are given for the minimum injected irradiance required for amplification of the injected seed beam to exceed ASE from the amplifier, including the effects of gain saturation, assuming one dimensional radiative transfer.

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Comment on “Grazing incidence X-ray fluorescence of periodic structures – a comparison between X-ray standing waves and geometrical optics calculations” by F. Reinhardt, S. H. Nowak, B. Beckhoff, J-C. Dousse and M. Schoengen, JAAS, 2014, 29, 1778

Journal of Analytical Atomic Spectrometry ◽

10.1039/c5ja00040h ◽

2015 ◽

Vol 30 (12) ◽

pp. 2548-2550

Author(s):

W. Jark ◽

D. Eichert

Keyword(s):

Physical Model ◽

Periodic Structures ◽

Standing Waves ◽

Grazing Incidence ◽

Data Interpretation ◽

Geometrical Optics ◽

X Ray ◽

Model Based ◽

Published Paper

The data interpretation in the recently published paper with the above title is criticized and it is shown that an alternative more physical model based on diffraction in periodic structures can explain the data better and more consistently.

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