Publication

Mesures de températures ioniques dans un plasma de brève durée à l'aide d'un interféromètre de Fabry-Pérot multicanal

1971
Theses

Abstract

This work describes ion temperature measurements made by means of Doppler line broadening in a rotating magnetic field pinch experiment. A 12-channel Fabry-Perot interferometer has been constructed and profiles of various helium and impurity lines were measured as functions of time and position in the discharge tube. The theoretical standard deviation of the results was computed by a statistical analysis using a Monte-Carlo simulation programme. This allowed us to separate the real variations of the plasma from the fluctuations of the measurements. The main limitations of the accuracy of the results were due to lack. of light intensity and parasitic broadening mechanisms (Stark and reabsorption effects). Nevertheless, reasonable values of the temperatures of ionised nitrogen, oxygen and helium were obtained for three different filling pressures (20, 60 and 180 mTorr He).

Official source

https://infoscience.epfl.ch/entities/publication/1d7e1d9a-95b2-4f7b-941d-153de86127b9

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1971
Theses

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1d7e1d9a-95b2-4f7b-941d-153de86127b9

About this result

Related concepts (32)

Standard deviation

In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range. Standard deviation may be abbreviated SD, and is most commonly represented in mathematical texts and equations by the lower case Greek letter σ (sigma), for the population standard deviation, or the Latin letter s, for the sample standard deviation.

High-intensity discharge lamp

High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. This tube is filled with noble gas and often also contains suitable metal or metal salts. The noble gas enables the arc's initial strike. Once the arc is started, it heats and evaporates the metallic admixture.

Unbiased estimation of standard deviation

In statistics and in particular statistical theory, unbiased estimation of a standard deviation is the calculation from a statistical sample of an estimated value of the standard deviation (a measure of statistical dispersion) of a population of values, in such a way that the expected value of the calculation equals the true value. Except in some important situations, outlined later, the task has little relevance to applications of statistics since its need is avoided by standard procedures, such as the use of significance tests and confidence intervals, or by using Bayesian analysis.

Related publications (31)

Mesures de températures ioniques dans un plasma de brève durée à l'aide d'un interféromètre de Fabry-Pérot multicanal

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