Dotted-Array Plasma Production by Using a Line-Focusing Lens System  with Segmented Prism Array for Compact X-ray Laser Experiments

Yamaguchi, Naohiro; Fujikawa, Chiemi; Ohchi, Tadayuki; Hara, Tamio

doi:10.1143/jjap.39.5268

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…Therefore, an array of microplasma was produced on the target surface. 5 The power density ranged about 10 12 W/cm 2 for the former eight pulses at 2 J/cm incident energy. Schematic drawings of the experimental arrangement are shown in Fig.…”

Section: Methodsmentioning

confidence: 95%

Study of Compact X-Ray Laser Pumped by a Pulse-Train Laser

2002

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An advanced experiment has been performed to improve X-ray laser output in the recombination plasma scheme. Two 11-mm-long plasmas were produced by laser irradiation so that each axis aligned into a line consisting the double-target configuration. X-ray intensity of the 15.47 nm transition line of the Li-like Al ion was enhanced in the double-target scheme. A half-cavity experiment in the doubletarget configuration was also performed, and the enhancement of X-ray was also observed. The results in the half-cavity experiment were consistent with an estimation, where the two plasmas having positive gain contribute to amplify X-rays passing through plasmas and reflecting from the multilayer mirror. Measurements have been started to clarify spatial coherence of the lasing X-ray beam by using the dispersing coherent diagnostic system.

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Section: Methodsmentioning

confidence: 95%

Study of Compact X-Ray Laser Pumped by a Pulse-Train Laser

2002

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“…Moreover, the irradiation pattern showed small-scale modulation due to interference between divided laser beams, which resulted in the formation of an array of microdots on a target. 12) The irradiation pattern had an irradiation area of 50 mm Â 11 mm with microdots of 50 mm diameter and 140 mm pitch spacing, because of the interference pattern in the focused beam. The power density was in the range of 10 11 -10 12 W/cm 2 .…”

Section: Irradiation System and Targetsmentioning

confidence: 99%

Laser-Plasma X-ray Sources Using Ceramic Target

Takemura¹,

Yamaguchi

Hara³

2008

jjap

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Ceramic plates (AlN and alumina) were used as targets for laser-plasma X-ray sources for the first time. The radiation intensity of soft X-ray spectra from Li-like ions (Al XI) for the AlN target was almost the same as that in the case of pure aluminum target. It was found that the ceramic target can be irradiated at the same place up to 70 times or more, delivering soft X-rays with nearly the same intensity as in the case when a virgin surface was irradiated. The profiles of the crater marks formed on the target surface after irradiations were measured three-dimensionally and their hollow volumes below the initial surface were evaluated. The ablated mass for the AlN or alumina target was less than 1/6 of that for a pure Al target.

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“…Because of interference in the focused beam, the irradiation pattern consisted of small dots. The power density was about 5 × 10 11 W/cm 2 [18]. The tape target was made by sticking aluminum foil, 10 µ m thick and 10 mm wide, on 0.1 mm-thick polyethylene-terephthalate tape, which was placed in the target chamber equipped with a tape driver and a debris shield system.…”

Section: X-ray Sourcesmentioning

confidence: 99%

“…Prominent spectral lines are observed at around 13 nm, 15 nm and 16 nm. The cluster of lines around 15 nm originates from the transition lines of Al 10+ ions, Li-like Al, which are well known as x-ray laser transitions [18]; therefore, it is necessary for a higher excitation laser power to produce these highly ionized ions. On the other hand, the 13 nm emissions are the transition lines of Al 4+ ions and the 16 nm lines are those of Al 3+ ions, and these x-ray emissions can be produced with the lower incident laser power.…”

Section: X-ray Sourcesmentioning

confidence: 99%

Development of Photoelectron Microscope with Compact X-Ray Source Generated by Line-Focused Laser Irradiation

Yamaguchi

Takahashi

Nishimura

et al. 2005

J. Plasma Fusion Res.

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A laboratory-sized x-ray photoelectron microscope was constructed using a compact x-ray source produced by line-focused laser irradiation. The system is a scanning type photoelectron microscope in which the x-ray beam is micro-focused via Schwarzschild optics. A compact laser-plasma x-ray source has been developed consisting of a YAG laser, a line-focus lens assembly, an Al tape-target driver and a debris prevention system. The 13.1 nm x-rays were delivered from the line plasma whose length was 0.6 to 11 mm with higher intensity than that from a pointfocused source. Schwarzschild optics having a designed demagnification of 224 and coated with Mo/Si multilayers for 13.1 nm x-rays, was set on the beamline at a distance 1 m from the source. The electron energy analyzer was a spherical capacitor analyzer with a photoelectron image detection system that was suited for detection of a burst of photoelectrons excited by pulsed x-rays of ns-order duration. Photoelectron spectra were obtained having two peaks from As 3d and Ga 3d electrons, when a GaAs wafer was used as a sample. Spatial resolution of less than 5~3 µ m was confirmed from the variation of the As 3d electron intensity along the position of the GaAs sample coated with a photo-resist test pattern.

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Dotted-Array Plasma Production by Using a Line-Focusing Lens System with Segmented Prism Array for Compact X-ray Laser Experiments

Cited by 9 publications

References 8 publications

Study of Compact X-Ray Laser Pumped by a Pulse-Train Laser

Study of Compact X-Ray Laser Pumped by a Pulse-Train Laser

Laser-Plasma X-ray Sources Using Ceramic Target

Development of Photoelectron Microscope with Compact X-Ray Source Generated by Line-Focused Laser Irradiation

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