High-pressure volume discharges in gas lasers

Mesyats, G. A.; Korolev, Yu. D.

doi:10.1070/pu1986v029n01abeh003083

Cited by 34 publications

(41 citation statements)

References 14 publications

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“…The reason is that, when we increase the pressure, both the reduced electric field E br /p and the ratio V br /V st decrease. Such a behavior is associated with the fact that an average electric field in the gap approaches to a value of 2 MV/cm and the process of the field emission starts playing an important role in the discharge initiation [9]- [11].…”

Section: Experimental Arrangement and Obtained Datamentioning

confidence: 98%

“…Decreasing the gap separation leads to increasing the electric field in the gap. Then, the field can reach such a high value that the process of the field emission becomes noticeable which does not allow increasing the breakdown voltage of the gap and the reduced electric field [1], [9]- [11]. Hence, in every case, the choice of the operating conditions for the gap is a challenging problem.…”

Section: Introductionmentioning

confidence: 96%

“…Earlier, the models had been successfully used for the nanosecond time range [9], [12]. However, only a limited number of the works are available where the similar approaches are developed for the subnanosecond scale [1], [4], [13].…”

Section: Introductionmentioning

confidence: 99%

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High-Voltage Spark Gap in a Regime of Subnanosecond Switching

Korolev

Bykov

2012

IEEE Trans. Plasma Sci.

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This paper describes an investigation of a highvoltage spark gap in the conditions of subnanosecond switching. The high-voltage pulsed generator "Sinus" is used to charge a coaxial line loaded to a high-pressure spark gap. Typical charging time for the coaxial line is in a range from 1 to 2 ns, maximum charging voltage is up to 250 kV, and a range of pressures for the gap is from 2 to 9 MPa. The theoretical models of the switching process on subnanosecond time scale are examined. A general equation for temporal behavior of the gap voltage, which is applicable for the avalanche model and the Rompe-Weitzel model has been obtained. It is revealed that the approach based on the avalanche model offers a possibility to describe the switching process only at extremely high overvoltages. The Rompe-Weitzel model demonstrates a good agreement with the experimental data both for the conditions of static breakdown and for the regime of a high overvolted gap. Comparison of experimental and calculated voltage waveforms has made it possible to estimate an empirical constant in the Rompe-Weitzel model (the price of ionization). This constant is varied from 420 to 920 eV, depending on the initial electric field in the gap.Index Terms-High-pressure spark discharge, subnanosecond discharge, subnanosecond high-voltage generators.

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Section: Experimental Arrangement and Obtained Datamentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

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High-Voltage Spark Gap in a Regime of Subnanosecond Switching

Korolev

Bykov

2012

IEEE Trans. Plasma Sci.

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“…These data together with the data on figure 2, indicated as Mesyats, Nb4.2 and SC4.2 (Mesyats & Korolev 1966), show that it is possible to hold high fields in superconducting structures (again, for very short times). Accelerating structures proposed so far have propagation characteristics that can allow for multibunch acceleration.…”

mentioning

confidence: 73%

“…Another important feature of the operation in a gas avalanche mode is the fact that the breakdown occurs uniformly in the gas volume (Mesyats & Korolev 1966). A diagnostic characteristic of proper operation in the gas avalanche regime is the absence of bright filaments (sparks).…”

Section: Fast Switchingmentioning

confidence: 99%

Test of a High-gradient Low-emittance Electron Gun

Villa

Luccio

1997

Laser Part. Beams

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A maximum electric field E -2.65 GV/m with an accelerated electron current of 1 KA has been obtained, for pulse lengths of 130 ps, in an electron gun based on Pulse Power Technology. This is the highest accelerating field ever achieved in the presence of such a large current. Measurements of beam emittance and energy from 0.4 to 2.65 MeV show that the scaling of the invariant emittance with electric field and with beam current is consistent with theoretical predictions. A few applications of high-gradient acceleration are discussed.

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Numerical analysis of 2010 high‐mountain (Tien‐Shan) experiment on observations of thunderstorm‐related low‐energy neutron emissions

Babich¹,

Bochkov²,

Dwyer

et al. 2013

JGR Space Physics

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[1] The high-mountain experiment in a thunderstorm atmosphere, in which "extraordinary high flux of low-energy neutrons" was detected, is analyzed. Due to the lack of data on the radiation source, we do not analyze directly measured absolute count rates. Instead, we address the experimental configuration, namely, simultaneous measurements by shielded and unshielded helium counters, which allow a comparison of relative count rates and, thus, verifying the species of the detected radiation. Results of Monte Carlo simulations of neutron transport executed without aprioristic assumptions, using only data on the experimental configuration, have raised strong doubts as to whether the detected increases of the count rates can be attributed to neutrons. Results of simulations allowing for the neutron transport in atmosphere from distant (100-500 m) photoneutron source with spectrum in the range 0-20.1 MeV produced by relativistic runaway electron avalanche bremsstrahlung demonstrate that ratios R of the count rates of shielded and unshielded counters below 1 keV are manyfold higher than the ratios R exp ≈ 0.34-1.06 of the measured count rates. In the total range 0-20.1 MeV, the R magnitudes vary from 0.14 to 0.84 depending on the distance to the neutron source. Results of simulations of γ rays transport executed without aprioristic assumptions demonstrate that, most likely, hard γ rays with energies ε γ > 1 MeV were detected. We note that in thunderstorm environment, a selection is required of neutrons and γ rays, for which the time-of-flight technique is the most adequate.Citation: Babich, L. P., E. Bochkov, J. R. Dwyer, I. M. Kutsyk, and A. N. Zalyalov (2013), Numerical analysis of 2010 high-mountain (Tien-Shan) experiment on observations of thunderstorm-related low-energy neutron emissions,

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High-pressure volume discharges in gas lasers

Cited by 34 publications

References 14 publications

High-Voltage Spark Gap in a Regime of Subnanosecond Switching

High-Voltage Spark Gap in a Regime of Subnanosecond Switching

Test of a High-gradient Low-emittance Electron Gun

Numerical analysis of 2010 high‐mountain (Tien‐Shan) experiment on observations of thunderstorm‐related low‐energy neutron emissions

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