Publication

Nonlinear correlations in phase-space resolved fluctuations at drift wave frequencies

2007
Conference Papers

Abstract

In an effort to better understand plasma transport, we measure fluctuations associated with drift instabilities resolved in the ion phase-space. Primary attention is given to fluctuations near the electron drift frequency where there are two general components to the observed fluctuations. From two (spatial) point measurements of the ion distribution function with a variable separation along the magnetic field, a number of statistical measures of the fluctuations are calculated including cross-correlation and cross-bicoherence. Both fluid (omega/k >>upsilon(ti)) and kinetic (omega/k similar to upsilon(ti)) components are observed in the fluctuations. The nonlinear interactions are found to depend strongly on the ion particle velocity.

Official source

https://infoscience.epfl.ch/entities/publication/63f70165-84ca-4b23-a071-6d6f3fd09811

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2007
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/63f70165-84ca-4b23-a071-6d6f3fd09811

About this result

Related concepts (32)

Quantum fluctuation

In quantum physics, a quantum fluctuation (also known as a vacuum state fluctuation or vacuum fluctuation) is the temporary random change in the amount of energy in a point in space, as prescribed by Werner Heisenberg's uncertainty principle. They are minute random fluctuations in the values of the fields which represent elementary particles, such as electric and magnetic fields which represent the electromagnetic force carried by photons, W and Z fields which carry the weak force, and gluon fields which carry the strong force.

Cross-correlation

In signal processing, cross-correlation is a measure of similarity of two series as a function of the displacement of one relative to the other. This is also known as a sliding dot product or sliding inner-product. It is commonly used for searching a long signal for a shorter, known feature. It has applications in pattern recognition, single particle analysis, electron tomography, averaging, cryptanalysis, and neurophysiology. The cross-correlation is similar in nature to the convolution of two functions.

Correlation

In statistics, correlation or dependence is any statistical relationship, whether causal or not, between two random variables or bivariate data. Although in the broadest sense, "correlation" may indicate any type of association, in statistics it usually refers to the degree to which a pair of variables are linearly related. Familiar examples of dependent phenomena include the correlation between the height of parents and their offspring, and the correlation between the price of a good and the quantity the consumers are willing to purchase, as it is depicted in the so-called demand curve.

Related publications (32)

Nonlinear correlations in phase-space resolved fluctuations at drift wave frequencies

Chat with Graph Search

The Diocotron Instability in the Trapped Electrons Experiment T-REX and its Relevance to Electron Clouds in Gyrotron Guns

Electromagnetic gyrokinetic simulation of drift wave turbulence in ADITYA-U with collisions

Combined caLculation of Ultra‐high field Biases (CLUB ) With Sandwich: Fast, Simultaneous Estimation of 3D B 0 and Multi‐Channel B 1 + Maps at 7 T