Neutron Spectrum Measured by Activation Diagnostics in Deuterium Gas-Puff Experiments on the 3 MA GIT-12 Z-Pinch

Cikhardt, J.; Klír, D.; Řezáč, K.; Shishlov, A. V.; Cherdizov, R. K.; Cikhardtová, B.; Дудкин, Г. Н.; Fursov, F. I.; Kokshenev, V. A.; Kravárik, J.; Kubeš, P.; Kurmaev, N. E.; Labetsky, A. Yu.; Padalko, V. N.; Ratakhin, N. A.; Sila, O.; Turek, K.; Варлачев, В. А.

doi:10.1109/tps.2017.2763641

Cited by 6 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, in the shot presented in figure 10, we achieved a high yield of (1.1±0.3)×10 13 neutrons. In order to be confident with absolute yields, the number of neutrons is measured by several independent techniques [77]. The significant neutron yield increase with a large neutronproducing sample can be seen in figure 10(c) which shows the comparison of nToF signals in 3 different configurations at the same current.…”

Section: Generation Of 10 13 Neutrons With a Large Neutron-producing mentioning

confidence: 99%

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

et al. 2018

View full text Add to dashboard Cite

Acceleration of high energy ions was observed in z-pinches and dense plasma foci as early as the 1950s. Even though many theories have been suggested, the ion acceleration mechanism remains a source of controversy. Recently, the experiments on the GIT-12 generator demonstrated acceleration of ions up to 30 MeV from a deuterium gas-puff z-pinch. High deuteron energies enable us to obtain unique information about spatial, spectral and temporal properties of accelerated ions. In particular, the offaxis ion emission from concentric circles of a ∼1 cm diameter and the radial lines in an ion beam profile are germane for the discussion of acceleration mechanisms. The acceleration of 30 MeV deuterons can be explained by the fast increase of an impedance with a sub-nanosecond e-folding time. The high (>10 Ω) impedance is attributed to a space-charge limited flow after the effective ejection of plasmas from m=0 constrictions. Detailed knowledge of the ion acceleration mechanism is used with a neutron-producing catcher to increase neutron yields above 10 13 at a currentof2.7 MA.

show abstract

Section: Generation Of 10 13 Neutrons With a Large Neutron-producing mentioning

confidence: 99%

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The peak neutron yield observed in 150 shots with the hybrid deuterium gas-puff, i.e.without any neutron-producing catcher, was (5.9±1.2)×10 12 . In order to be confident with the origin and absolute yields of neutrons, the neutron emission was diagnosed by several independent techniques described in [29].…”

Section: Gross Dynamics Of a Hybrid Deuterium Gas-puff Z-pinchmentioning

confidence: 99%

“…The yields of >10 MeV and >12 MeV neutrons were measured by a BDS-10000 super-heated fluid detector [30] and by the 63 Cu(n, 2n) 62 Cu reaction in the copper activation sample [29], respectively. Most of >10 MeV neutrons originated from the 7 Li(d, n) reaction with the Q-value of 15.03 MeV.…”

Section: Neutron Emission From Lif Samples Placed At Various Distance...mentioning

confidence: 99%

Acceleration of protons and deuterons up to 35 MeV and generation of 10¹³ neutrons in a megaampere deuterium gas-puff z-pinch

Klír¹,

Shishlov²,

Kokshenev³

et al. 2018

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

The acceleration of hydrogen ions up to 35 MeV is observed in the z-pinch experiments on the GIT-12 generator at a 3 MA current and 0.6 MV driving voltage. High ion energies are obtained with a novel configuration of a deuterium gas-puff z-pinch. In this configuration, a hollow cylindrical plasma shell is injected around an inner deuterium gas puff to form a homogeneous, uniformly conducting layer between electrodes at the initial phase of z-pinch implosion. The stable implosion at the velocity up to 650 km s −1 is important to deliver more current onto the z-pinch axis. Magnetohydrodynamic instabilities become apparent first at stagnation. After the disruptive development of m=0 instabilities, ∼20 ns pulses of high-energy photons, neutrons, electrons, and ions are observed. The average neutron yield is 2×10 12 . The ion emission is characterized by various diagnostic techniques including those based on the usage of neutronproducing samples. When a large neutron-producing sample is placed onto the axis below a cathode mesh, the neutron yield is increased up to (1.1±0.3)×10 13 . Considering a ∼130 kJ energy input into z-pinch plasmas and magnetic field, this implies the neutron production efficiency of ∼10 8 neutrons per one Joule of the z-pinch energy.

show abstract

Ion acceleration and neutron production in hybrid gas-puff z-pinches on the GIT-12 and HAWK generators

Klír

Jackson

Shishlov

et al. 2020

Matter and Radiation at Extremes

View full text Add to dashboard Cite

Z-pinch experiments with a hybrid configuration of a deuterium gas puff have been carried out on the HAWK (NRL, Washington, DC) and GIT-12 (IHCE, Tomsk) pulsed power generators at 0.7 MA and 3 MA currents, respectively. On GIT-12, neutron yields reached an average value of 2 × 1012 neutrons, and deuterons were accelerated up to an energy of 30 MeV. This was 50 times the ion energy provided by the generator driving voltage of 0.6 MV and the highest energy observed in z-pinches and dense plasma foci. To confirm these unique results independently on another device, we performed several experimental campaigns on the HAWK generator. Comparison of the experiments on GIT-12 and HAWK helped us to understand which parameters are essential for optimized neutron production. Since the HAWK generator is of a similar pulsed power architecture as GIT-12, the experiments on GIT-12 and HAWK are important for the study of how charged-particle acceleration scales with the current.

show abstract

Neutron Spectrum Measured by Activation Diagnostics in Deuterium Gas-Puff Experiments on the 3 MA GIT-12 Z-Pinch

Cited by 6 publications

References 28 publications

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

Acceleration of protons and deuterons up to 35 MeV and generation of 10¹³ neutrons in a megaampere deuterium gas-puff z-pinch

Ion acceleration and neutron production in hybrid gas-puff z-pinches on the GIT-12 and HAWK generators

Contact Info

Product

Resources

About

Neutron Spectrum Measured by Activation Diagnostics in Deuterium Gas-Puff Experiments on the 3 MA GIT-12 Z-Pinch

Cited by 6 publications

References 28 publications

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

Acceleration of protons and deuterons up to 35 MeV and generation of 1013 neutrons in a megaampere deuterium gas-puff z-pinch

Ion acceleration and neutron production in hybrid gas-puff z-pinches on the GIT-12 and HAWK generators

Contact Info

Product

Resources

About

Acceleration of protons and deuterons up to 35 MeV and generation of 10¹³ neutrons in a megaampere deuterium gas-puff z-pinch