# Turbulence analysis of an experimental flux-rope plasma

@article{Schaffner2013TurbulenceAO, title={Turbulence analysis of an experimental flux-rope plasma}, author={David A. Schaffner and V. S. Lukin and A. Wan and M. R. Brown}, journal={Plasma Physics and Controlled Fusion}, year={2013}, volume={56} }

We have previously generated elongated Taylor double-helix flux-rope plasmas in the SSX MHD wind tunnel. These plasmas are remarkable in their rapid relaxation (about one Alfvén time) and their description by simple analytical Taylor force-free theory despite their high plasma β and high internal flow speeds. We report on the turbulent features observed in these plasmas including frequency spectra, autocorrelation function, and probability distribution functions of increments. We discuss here…

## 13 Citations

### Observation of turbulent intermittency scaling with magnetic helicity in an MHD plasma wind tunnel.

- PhysicsPhysical review letters
- 2014

Evidence is provided which supports the hypothesis that current sheets and reconnection sites are related to the generation of this intermittent signal, but the true nature of the observed intermittency remains unknown.

### SSX MHD plasma wind tunnel

- Physics
- 2015

A new turbulent plasma source at the Swarthmore Spheromak Experiment (SSX) facility is described. The MHD wind tunnel configuration employs a magnetized plasma gun to inject high-beta plasma into a…

### MHD plasma wind tunnel

- Physics
- 2015

A new turbulent plasma source at the Swarthmore Spheromak Experiment (SSX) facility is described. The MHD wind tunnel configuration employs a magnetized plasma gun to inject high-beta plasma into a…

### Magnetohydrodynamic turbulence: Observation and experimenta)

- Physics
- 2015

We provide a tutorial on the paradigms and tools of magnetohydrodynamic (MHD) turbulence. The principal paradigm is that of a turbulent cascade from large scales to small, resulting in power law…

### Laboratory sources of turbulent plasma: a unique MHD plasma wind tunnel

- Physics
- 2014

Turbulence has been studied in laboratory plasmas for decades. Magnetic and electrostatic turbulence fluctuations have been implicated in degraded confinement in fusion devices so understanding…

### Possible signatures of dissipation from time-series analysis techniques using a turbulent laboratory magnetohydrodynamic plasma

- Physics
- 2016

The frequency spectrum of magnetic fluctuations as measured on the Swarthmore Spheromak Experiment is broadband and exhibits a nearly Kolmogorov 5/3 scaling. It features a steepening region which is…

### Measurement of the Taylor scale in a magnetized turbulent laboratory plasma wind-tunnel

- PhysicsPhysics of Plasmas
- 2022

The fluid Taylor scale is measured in the Bryn Mawr Experiment (BMX) of the Bryn Mawr Plasma Laboratory and examined as a potential dissipation scale of magnetic turbulence within the plasma. We…

### MULTIFRACTAL AND MONOFRACTAL SCALING IN A LABORATORY MAGNETOHYDRODYNAMIC TURBULENCE EXPERIMENT

- Physics
- 2015

Both multifractal and monofractal scaling of structure function exponents are observed in the turbulent magnetic fluctuations of the Swarthmore Spheromak Experiment plasma. Structure function and…

### Measuring the equations of state in a relaxed magnetohydrodynamic plasma.

- PhysicsPhysical review. E
- 2018

Measurements of the equations of state of a fully relaxed magnetohydrodynamic (MHD) laboratory plasma find that the MHD equation of state is inconsistent with the data.

### Magnetothermodynamics: Measurements of the thermodynamic properties in a relaxed magnetohydrodynamic plasma

- Physics
- 2018

We have explored the thermodynamics of compressed magnetized plasmas in laboratory experiments and we call these studies "magnetothermodynamics". The experiments are carried out in the Swarthmore…

## References

SHOWING 1-10 OF 37 REFERENCES

### 3D simulations of fluctuation spectra in the hall-MHD plasma.

- PhysicsPhysical review letters
- 2009

The results of the 3D simulations exhibit that turbulent spectral cascades in the presence of a mean magnetic field follow an omnidirectional anisotropic inertial-range spectrum close to k(-7/3).

### Magnetic reconnection in two-dimensional magnetohydrodynamic turbulence.

- PhysicsPhysical review letters
- 2009

Systematic analysis of numerical simulations of two-dimensional magnetohydrodynamic turbulence reveals the presence of a large number of X-type neutral points where magnetic reconnection occurs. We…

### Statistics of magnetic reconnection in two-dimensional magnetohydrodynamic turbulence

- Physics
- 2010

The nonlinear dynamics of magnetic reconnection in turbulence is investigated through direct numerical simulations of decaying, incompressible, two-dimensional magnetohydrodynamics. Recently, it was…

### Intermittent MHD structures and classical discontinuities

- Physics
- 2008

We examine statistics of rapid spatial variations of the magnetic field in simulations of magnetohydrodynamic (MHD) turbulence, by analyzing intermittency properties, and by using classical methods…

### Statistical association of discontinuities and reconnection in magnetohydrodynamic turbulence

- Physics
- 2011

[1] Using high Reynolds number simulations of two-dimensional magnetohydrodynamic (2-D MHD) turbulence as a test case, a statistical association between tangential discontinuities and magnetic…

### INVESTIGATION OF INTERMITTENCY IN MAGNETOHYDRODYNAMICS AND SOLAR WIND TURBULENCE: SCALE-DEPENDENT KURTOSIS

- Physics
- 2011

The behavior of scale-dependent (or filtered) kurtosis is studied in the solar wind using magnetic field measurements from the ACE and Cluster spacecraft at 1 AU. It is also analyzed numerically with…

### Magnetic reconnection as an element of turbulence

- Physics
- 2011

Abstract. In this work, recent advances on the study of reconnection in turbulence are reviewed. Using direct numerical simulations of decaying incompressible two-dimensional magnetohydrodynamics…

### STATISTICAL ANALYSIS OF DISCONTINUITIES IN SOLAR WIND ACE DATA AND COMPARISON WITH INTERMITTENT MHD TURBULENCE

- Physics
- 2009

The comparison between Advanced Composition Explorer (ACE) solar wind data and simulations of magnetohydrodynamic (MHD) turbulence shows a good agreement in the waiting-time analysis of magnetic…

### Relaxation and magnetic reconnection in plasmas

- Physics
- 1986

The theory of plasma relaxation is described and developed. Turbulence, allied with a small resistivity, allows the plasma rapid access to a particular minimum-energy state. This process involves…

### Depression of nonlinearity in decaying isotropic MHD turbulence.

- PhysicsPhysical review letters
- 2008

Spectral method simulations show that undriven magnetohydrodynamic turbulence spontaneously generates coherent spatial correlations of several types, associated with local Beltrami fields,…