Characteristics of High-Density Theat-Pinches Seeded With Selected High-Z Elements

Thomson, D.B.; Jones, Llewellyn H.; Bailey, Aimee G.; Engleman, Rolf

doi:10.1016/b978-0-08-020941-8.50032-9

Cited by 15 publications

(3 citation statements)

References 3 publications

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“…To produce the plasma in this experiment we used a theta pinch (Thomson et al 1976) with a single-turn coil, internal diameter 8.2cm by 25cm long, driven by a 60 kJ, 60 kV capacitor bank. The discharge tube was a quartz tube with an inside diameter of 6.5 cm.…”

Section: Methodsmentioning

confidence: 99%

Measurement of the total collisional ionization rates of Ne VI, VII and VIII

Jones

Källne

Thomson

1977

J. Phys. B: At. Mol. Phys.

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Abstract.The total collisional ionization rates of neon VI, 1/11 and VIII have been measured in a time-evolving theta-pinch plasma. The method used was to calculate the expected emission from our plasma using the measured time-and space-dependent electron density (10'6-10" cm-3 ) and temperature (120400 eV). The semi-empirical ionization rates of Kunze and Lotz were used in our calculation and were adjusted, by multiplying with a constant, so that the predicted photon emission matched the observed line emission. The multiplicative factors, with estimated errors, required for best fit are: for neon VI, 0.15 0.2; and for neon VIII. 0.7 + 0.25. Also, a comparison is made between the semi-empirical rates used in this work and the recently calculated rates of Summers. These recently calculated rates were in good agreement with our experiment for neon VII and VIII. For neon VI, however, the departure from our experimental result was even farther than for the semi-empirical rate. 0.1: for neon VI]; 0.4

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Section: Methodsmentioning

confidence: 99%

Measurement of the total collisional ionization rates of Ne VI, VII and VIII

Jones

Källne

Thomson

1977

J. Phys. B: At. Mol. Phys.

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show abstract

“…One type is the theta pinch plasma experiment where one considers a plasma seeded with the material to be investigated and observes the emission of radiation from this seeded plasma. Early exploratory feasibility experiments were reported by Thomson et al (1976) and Thomson (1980). A 2% Ne-seeded He theta pinch plasma driven by a 9.0 T magnetic field in a 0.25 m long coil achieved an electron density of 6 10 23 m 3 at a temperature equivalent of about 40 eV at about 1:0 s ( Thomson et al 1976).…”

Section: High-temperature Plasmasmentioning

confidence: 99%

“…Early exploratory feasibility experiments were reported by Thomson et al (1976) and Thomson (1980). A 2% Ne-seeded He theta pinch plasma driven by a 9.0 T magnetic field in a 0.25 m long coil achieved an electron density of 6 10 23 m 3 at a temperature equivalent of about 40 eV at about 1:0 s ( Thomson et al 1976). Decreasing the filling pressure to about 5.3 Pa extended the containment time to 2.5 s at an electron density of about 10 23 m 3 , with the plasma judged to be sufficiently homogeneous for studies of atomic properties and opacity.…”

Section: High-temperature Plasmasmentioning

confidence: 99%