On the time of lasing onset and the end-effect of a soft x-ray laser device using a capillary z-pinch discharge

Hayashi, Yasushi; Sakamoto, Nobuhiro; Zhao, Yijun; Cheng, Yuanyuan; Chalise, P.R.; Watanabe, M.; Okino, Akitoshi; Horioka, Kazuhiko; Hotta, Eiki

doi:10.1088/0963-0252/13/4/017

Cited by 7 publications

(8 citation statements)

References 5 publications

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“…13 To counteract ionization-induced refractive defocusing, 14 the plasma that comes into contact with the laser should be fully ionized. A few types of such waveguides exist, such as dischargeablated waveguides, [15][16][17][18][19][20][21] pinch plasmas, 8,22,23 and slow capillary discharges. 7,[24][25][26][27] Our investigation focuses on the latter.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a square pulsed capillary discharge waveguide for interferometry measurements

et al. 2007

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Slow pulsed capillary discharges in round capillaries are currently under investigation for use as plasma channel laser waveguides in laser-wakefield acceleration, x-ray lasers, and higher-harmonic generation. In this study, a capillary discharge with a square cross section is presented. The electron density, which determines the laser guiding properties, can be measured by means of transverse interferometry in this device. Using a numerical model of the plasma and the capillary wall, an analysis of the discharge is made. The results predict that the square channel is capable of guiding circular laser pulses. The guiding properties are quite similar to those of a round channel with nearly the same diameter as the channel width. This suggests the results obtained by measuring the square capillary discharge are applicable for round channels as well. It was found that the wall heating was inhomogeneous, which makes the wall more susceptible to ablation. The heating of the wall changes the transverse optical pathlength in the interferometry experiments.

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Section: Introductionmentioning

confidence: 99%

Modeling of a square pulsed capillary discharge waveguide for interferometry measurements

et al. 2007

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“…5. Therefore, the laser spike is not produced around the first pinching time as in [8] and [11]. Comparing the laser spike with the pinch process, we find that the background light begins to emit around the first pinching time and the laser spike occurs near the third pinch time.…”

Section: Resultsmentioning

confidence: 92%

“…The snow-plow model is used to simulate the process. In the model, the main equation is as follows [8]:…”

Section: Multiple Pinch Of Plasmamentioning

confidence: 99%

“…The results of MHD show that the plasma suitable for laser is an electron density of (0.3 − 1) × 10 19 cm −3 and an electron temperature of around 60 eV (see [6]). In addition, the simplified model (the so-called 'snow-plow' model) of the dynamic plasma pinch is used to simulate the variation of plasma radius in the pinch process [7,8]. A comparison of the results of snow-plow model with the time of lasing onset can provide some qualitative understanding of the pinch process.…”

Section: Introductionmentioning

confidence: 99%

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Laser output and multiple pinches of plasma in capillary discharge

et al. 2008

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The pinch process of plasma columns generated by capillary discharge is studied theoretically with a snow-plow model. The multiple pinch evolution of plasma is obtained from the theoretical results. The effects of pressure and current amplitude on multiple pinches are calculated, and the results show that the pinch time decreases nonlinearly with decreasing pressure or increasing current. In the experiment, the laser spike of Ne-like Ar at 46.9 nm is obtained with an X-ray diode (XRD). The pressure filling in the capillary is changed to observe the variation of lasing onset time. According to real current waveforms, the pinch process is simulated. The results show that the laser spike occurs around the third pinching time. In addition, the experimental results indicate that there is an optimum pressure for the laser output.

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“…We define the first pinching time as the time when the plasma is pinched to the minimum radius for the first time. With high pressure (39 Pa), the laser spike occurs around the first pinching time [9]. With different main current waveforms, we study the time of lasing onset at low pressure (25 Pa).…”

Section: Introductionmentioning

confidence: 99%

Effects of capillary discharge current on the time of lasing onset of soft x-ray laser at low pressure

Zhao¹,

Cheng²,

Luan³

et al. 2006

J. Phys. D: Appl. Phys.

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The laser spike of Ne-like argon 46.9 nm pumped by a capillary discharge is measured with an x-ray diode (XRD) at low Ar pressure (25 Pa). Changing the rise-time and amplitude of the main current, we observe the effects of current on the time of the laser spike. The experimental results show that the time of lasing onset, which is the time of the laser spike after the onset of the main current, is larger than 40 ns and almost constant when the rise-time and amplitude of the current are changed. The theoretical results are calculated with the snow-plough model and show that the plasma is pinched several times before the laser spike occurs.

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On the time of lasing onset and the end-effect of a soft x-ray laser device using a capillary z-pinch discharge

Cited by 7 publications

References 5 publications

Modeling of a square pulsed capillary discharge waveguide for interferometry measurements

Modeling of a square pulsed capillary discharge waveguide for interferometry measurements

Laser output and multiple pinches of plasma in capillary discharge

Effects of capillary discharge current on the time of lasing onset of soft x-ray laser at low pressure

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