Time-resolved XUV radiation diagnostics from nitrogen discharge Z-pinch plasma

Nevrkla, Michal; Jančárek, A.; Hübner, Jakub; Sheftman, Danny; Pı́na, L.; Vrba, Pavel; Vrbová, M.

doi:10.1117/12.893742

Cited by 4 publications

(4 citation statements)

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“…The shape of the current impulse is defined by an electric circuit joined to a capillary. At present, most of available sources [7][8][9] can be approximated by a damped sinus curve I(t) = I 0 sin πt 2t1 e −t/t2 ; instead of I 0 it is better to use I max (range 35-50 kA), which can be associated with the amount of overall energy deposited in the capillary; t 1 (range 15-120 ns) is a quarter period, and t 2 (range 30-300 ns) is a term for exponential decay. The fourth parameter is the initial density N 0 (range 0.5 • 10 17 -5 • 10 17 cm −3 ) (or pressure), and the fifth is the radius of the capillary r 0 (range 0.25-2.5 mm).…”

Section: The Role Of Capillary Parametersmentioning

confidence: 99%

A Study of Coherent Radiation Generated in an Ablative Capillary Discharge

Hübner¹,

Vrba²

2013

Acta Polytech

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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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Section: The Role Of Capillary Parametersmentioning

confidence: 99%

A Study of Coherent Radiation Generated in an Ablative Capillary Discharge

Hübner¹,

Vrba²

2013

Acta Polytech

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“…Numerical simulations also predict high gain in H-like Nitrogen 1 with a discharge current I > 60 kA and a current slope dI/dt ~ 2×10 12 As -1 , which are obtainable using a capillary discharge driver with an endurable charging voltage of V ~ 100s kV. Several research groups attempt to obtain laser output with drivers with parameters approaching theoretical requirements [13][14][15][16] . No amplification had been observed yet, but plasma diagnostic indicates, that plasma parameters are very close to the one, for which theory predicts gain 13 , but there is need for increasing discharge current amplitude.…”

Section: Introductionmentioning

confidence: 99%

“…No amplification had been observed yet, but plasma diagnostic indicates, that plasma parameters are very close to the one, for which theory predicts gain 13 , but there is need for increasing discharge current amplitude. Driver's basic parameters used in experiments from [13][14][15][16] are summarized in Table 1. In Table 1, there are also parameters of the new driver expected from PSpice simulations.…”

Section: Introductionmentioning

confidence: 99%

Discharge driver for 13.4 nm XUV laser

Nevrkla

Jančárek

Nawaz

2013

2013 19th IEEE Pulsed Power Conference (PPC)

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During adiabatic expansion of Z-pinching plasma column can arise conditions suitable for amplified spontaneous emission (ASE) pumped by 3-body recombination. MHD and kinetic simulations had shown 1 , that capillary discharge with current amplitude I > 60 kA and slope dI/dt > 2×10 12 As -1 can produce plasma condition for ASE of H-like nitrogen Balmer-alpha line at 13.4 nm. Discharge driver capable to deliver up to 90 kA with rise-time ~25 ns into 22 cm long capillary was designed. Driver is based on water slab capacitor pulse compression stages switched by spark-gap. Capillary is charged symmetrically with voltage up to ±160 kV. ~100 A high-frequency current pulse is used to pre-ionize gas in the capillary. The driver will be used primarily as an experimental device to study capillary plasma for ASE by 3-body recombination, and secondarily as a source of high intensity incoherent XUV radiation in water-window region.

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“…In later calculations gain has been predicted also for 5 mm diameter capillary with similar current and lower initial nitrogen pressure 8 . Several experiments [9][10][11][12] have been done to prove those predictions, but no ASE has been measured. In 9,10 conditions for lasing were nearly reached, except of the electron temperature in the pinch, which was around 70% of the required value.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved EUV spectra from nitrogen Z-pinching capillary discharge

et al. 2015

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Time-integrated spectra and time-resolved spectra (20 ns resolution) of nitrogen discharge plasma radiation were recorded and analyzed. Plasma was created by a 70 kA, 29 ns rise-time current pulse flowing through a 5 mm inner diameter, 224 mm long capillary filled with nitrogen to initial pressure ∼0.1 ÷ 1 kPa. Spectra were captured in the wavelength range 8.3 ÷ 14 nm. This spectral region contains nitrogen Balmer series lines including potentially lasing NVII 2 -3 transition 1 . Spectral lines were identified using the NIST database and the FLY kinetic code. Together with spectra the capillary current was measured. Due to the low inductance design of the driver, the pinch is observable directly from the measured current. 13.38 nm NVII 2 -3 line was observed in gated, and also in time-integrated spectra for currents >60 kA. For higher gas-filling pressure also other Balmer series lines were observed.

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Time-resolved XUV radiation diagnostics from nitrogen discharge Z-pinch plasma

Cited by 4 publications

References 0 publications

A Study of Coherent Radiation Generated in an Ablative Capillary Discharge

A Study of Coherent Radiation Generated in an Ablative Capillary Discharge

Discharge driver for 13.4 nm XUV laser

Time-resolved EUV spectra from nitrogen Z-pinching capillary discharge

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