Abstract
The mechanism for the heating of the plasma of a Z pinch due to the generation of toroidal magnetic structures (magnetic bubbles) which are formed in the plasma as a result of the penetration of the azimuthal magnetic field into the gas puff plasma was investigated experimentally. The experiments were performed with single-shell and double-shell gas puffs (60/30 mm in diameter) on the IMRI-4 generator (Imax = 350 kA, T/4 = 1.1 μs). The gases used for the gas puff material were neon, argon, and krypton. Electrical investigations have shown that the final resistance of the plasma depends on the linear mass of the gas puff and equals to ∼0.06 ÷ 0.1 Ω, which coincides in the order of magnitude with the prediction of the theory of an enhanced energy deposition into the plasma of a Z pinch. Probing of the plasma was carried out with a YAG:Nd3+ laser with a wavelength of 532 nm, a pulse energy of the order of 30 mJ, and a pulse full-width at half-maximum of ∼5 ns. Polarimetry has shown that at the stage of stagnation of a Z pinch, there are regions inside the plasma column where the radial distribution of the electron density has a local minimum. The rotation of the polarization plane of the electromagnetic wave probing the plasma suggests that some portion of the azimuthal magnetic field of the Z pinch is captured by the current loop (a magnetic bubble is formed). The magnetic field inside the magnetic bubble is, on the average, 600 ÷ 800 kG and coincides in the order of magnitude with the magnetic field near the pinch boundary.
| Original language | English |
|---|---|
| Pages (from-to) | 524-531 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Plasma Science |
| Volume | 30 |
| Issue number | 2 II |
| DOIs | |
| Publication status | Published - 1 Apr 2002 |
| Externally published | Yes |
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Keywords
- MHD- and RT-instabilities
- Plasma measurements
- Plasma pinch
- Polarimetry
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
An experimental study of the effect of Rayleigh-Taylor instabilities on the energy deposition into the plasma of a Z pinch. / Labetsky, Aleksey Yu; Baksht, Rina B.; Oreshkin, Vladimir I.; Rousskikh, Alexander G.; Shishlov, Alexander V.
In: IEEE Transactions on Plasma Science, Vol. 30, No. 2 II, 01.04.2002, p. 524-531.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An experimental study of the effect of Rayleigh-Taylor instabilities on the energy deposition into the plasma of a Z pinch
AU - Labetsky, Aleksey Yu
AU - Baksht, Rina B.
AU - Oreshkin, Vladimir I.
AU - Rousskikh, Alexander G.
AU - Shishlov, Alexander V.
PY - 2002/4/1
Y1 - 2002/4/1
N2 - The mechanism for the heating of the plasma of a Z pinch due to the generation of toroidal magnetic structures (magnetic bubbles) which are formed in the plasma as a result of the penetration of the azimuthal magnetic field into the gas puff plasma was investigated experimentally. The experiments were performed with single-shell and double-shell gas puffs (60/30 mm in diameter) on the IMRI-4 generator (Imax = 350 kA, T/4 = 1.1 μs). The gases used for the gas puff material were neon, argon, and krypton. Electrical investigations have shown that the final resistance of the plasma depends on the linear mass of the gas puff and equals to ∼0.06 ÷ 0.1 Ω, which coincides in the order of magnitude with the prediction of the theory of an enhanced energy deposition into the plasma of a Z pinch. Probing of the plasma was carried out with a YAG:Nd3+ laser with a wavelength of 532 nm, a pulse energy of the order of 30 mJ, and a pulse full-width at half-maximum of ∼5 ns. Polarimetry has shown that at the stage of stagnation of a Z pinch, there are regions inside the plasma column where the radial distribution of the electron density has a local minimum. The rotation of the polarization plane of the electromagnetic wave probing the plasma suggests that some portion of the azimuthal magnetic field of the Z pinch is captured by the current loop (a magnetic bubble is formed). The magnetic field inside the magnetic bubble is, on the average, 600 ÷ 800 kG and coincides in the order of magnitude with the magnetic field near the pinch boundary.
AB - The mechanism for the heating of the plasma of a Z pinch due to the generation of toroidal magnetic structures (magnetic bubbles) which are formed in the plasma as a result of the penetration of the azimuthal magnetic field into the gas puff plasma was investigated experimentally. The experiments were performed with single-shell and double-shell gas puffs (60/30 mm in diameter) on the IMRI-4 generator (Imax = 350 kA, T/4 = 1.1 μs). The gases used for the gas puff material were neon, argon, and krypton. Electrical investigations have shown that the final resistance of the plasma depends on the linear mass of the gas puff and equals to ∼0.06 ÷ 0.1 Ω, which coincides in the order of magnitude with the prediction of the theory of an enhanced energy deposition into the plasma of a Z pinch. Probing of the plasma was carried out with a YAG:Nd3+ laser with a wavelength of 532 nm, a pulse energy of the order of 30 mJ, and a pulse full-width at half-maximum of ∼5 ns. Polarimetry has shown that at the stage of stagnation of a Z pinch, there are regions inside the plasma column where the radial distribution of the electron density has a local minimum. The rotation of the polarization plane of the electromagnetic wave probing the plasma suggests that some portion of the azimuthal magnetic field of the Z pinch is captured by the current loop (a magnetic bubble is formed). The magnetic field inside the magnetic bubble is, on the average, 600 ÷ 800 kG and coincides in the order of magnitude with the magnetic field near the pinch boundary.
KW - MHD- and RT-instabilities
KW - Plasma measurements
KW - Plasma pinch
KW - Polarimetry
UR - http://www.scopus.com/inward/record.url?scp=0036547681&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036547681&partnerID=8YFLogxK
U2 - 10.1109/TPS.2002.1024285
DO - 10.1109/TPS.2002.1024285
M3 - Article
AN - SCOPUS:0036547681
VL - 30
SP - 524
EP - 531
JO - IEEE Transactions on Plasma Science
JF - IEEE Transactions on Plasma Science
SN - 0093-3813
IS - 2 II
ER -