Continuum Radiation in the X Ray and Visible Regions from a Magnetically Compressed Plasma (Scylla)

Jahoda, F. C.; Little, E. M.; Quinn, W.E.; Sawyer, G.A.; Stratton, T. F.

doi:10.1103/physrev.119.843

Cited by 206 publications

(51 citation statements)

References 12 publications

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“…It follows that the ratio of the emissivities or brightnesses from the same part of the plasma through two different beryllium filter thicknesses are each a function of the electron temperature in that region. 8 between the ratio and the temperature is a polynomial function whose coefficients can be found by modeling the bremsstrahlung radiation for many plasma temperatures. 3,7 Simulations explore the temperature measuring capabilities of the diagnostic upgrade using both the direct brightness and tomographic emissivity techniques.…”

Section: Methodsmentioning

confidence: 99%

A new double-foil soft x-ray array to measure Te on the MST reversed field pinch

McGarry

Franz

Hartog

et al. 2010

Review of Scientific Instruments

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A soft x-ray (SXR) diagnostic to measure electron temperature on the Madison Symmetric Torus using two complementary methods is presented. Both methods are based on the double-foil technique, which calculates electron temperature via the ratio of SXR bremsstrahlung emission from the plasma in two different energy ranges. The tomographic emissivity method applies the double-foil technique to a tomographic reconstruction of SXR emissivity, creating a two-dimensional map of temperature throughout the plasma. In contrast, the direct brightness method applies the double-foil technique directly to the measured brightness and generates vertical and horizontal radial profiles. Extensive modeling demonstrates advantages and limitations in both techniques. For example, although the emissivity technique provides a two-dimensional mapping of temperature, its reliance on multiple tomographic inversions introduces some artifacts into the results. On the other hand, the more direct brightness technique avoids these artifacts but is only able to provide a radial profile of electron temperature.

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Section: Methodsmentioning

confidence: 99%

A new double-foil soft x-ray array to measure Te on the MST reversed field pinch

McGarry

Franz

Hartog

et al. 2010

Review of Scientific Instruments

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“…Foil absorption technique is often applied to measure the electron temperature in a plasma. 31,32 This is based on the fact that the ratio of the integrated spectra observed through two different filters is a function of the electron temperature. In this method, x-rays from the source are passed through different thickness of an appropriate material and the signals are recorded.…”

Section: Evaluation Of Plasma Electron Temperaturementioning

confidence: 99%

Effect of insulator sleeve material on the x-ray emission from a plasma focus device

et al. 2010

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The effect of insulator sleeve material on x-ray emission from a 2.3 kJ Mather type plasma focus device operated in argon-hydrogen mixture is investigated. The time and space resolved x-ray emission characteristics are studied by using a three channel p-i-n diode x-ray spectrometer and a multipinhole camera. The x-ray emission depends on the volumetric ratio of argon-hydrogen mixture as well as the filling pressure and the highest x-ray emission is observed for a volumetric ratio 40% Ar to 60% H 2 at 2.5 mbar filling pressure. The fused silica insulator sleeve produces the highest x-ray emission whereas nonceramic insulator sleeves such as nylon, Perspex, or Teflon does not produce focus or x-rays. The pinhole images of the x-ray emitting zones reveal that the contribution of the Cu K␣ line is weak and plasma x-rays are intense. The highest plasma electron temperature is estimated to be 3.3 and 3.6 keV for Pyrex glass and fused silica insulator sleeves, respectively. It is speculated that the higher surface resistivity of fused silica is responsible for enhanced x-ray emission and plasma electron temperature.

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“…In the first Scyllar experiments, we used a pure deuterium fill gas over a wide range of filling densities to check the general operation of the 6 pinch and the two-foil soft x-ray technique 7 to measure the electron temperature. The two-channel x-ray detector was coupled to the vacuum system (Ffc».…”

Section: B Operation With Pure Deuteriummentioning

confidence: 99%

Vacuum ultraviolet emission from a neon-seeded theta pinch

Thomson¹,

Bailey²,

Engleman³

1974

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Continuum Radiation in the X Ray and Visible Regions from a Magnetically Compressed Plasma (Scylla)

Cited by 206 publications

References 12 publications

A new double-foil soft x-ray array to measure Te on the MST reversed field pinch

A new double-foil soft x-ray array to measure Te on the MST reversed field pinch

Effect of insulator sleeve material on the x-ray emission from a plasma focus device

Vacuum ultraviolet emission from a neon-seeded theta pinch

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