Self-organized criticality in a cold plasma

Alex, Prince; Carreras, B. A.; Arumugam, Saravanan; Sinha, Suraj Kumar

doi:10.1063/1.5005560

Cited by 11 publications

(12 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During V A reversal, the expanded glow in regime II remains stable up to ∼536 V denoted by (F) in Figure 2, and for V A < 530 V, the glow discharge re‐organises to maintain quasineutrality through localisation of the plasma inside the coaxial plasma source, up to three distinctly visible multiple sheaths with sharp boundaries at the opening of the plasma source, through the addition of layers. [ 12,26 ] Henceforth, the anode potential V A ∼ 536 V will be termed as the lower critical voltage during the lowering of anode potential.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Study of self‐organised criticality in a coaxial plasma source with gridded cathode

Bose

Paul

2022

Contributions to Plasma Physics

View full text Add to dashboard Cite

Multiple luminous sheath structures develop in the localised plasma formation inside a cylindrical gridded cathode plasma source. These structures gradually expand into the whole vessel and undergo a critical state through self‐organised criticality (SOC) along with pronounced sheath oscillations during the variation of anode potential. The present investigation emphasises the stability properties associated with the oscillations of the sheath potential structures in the cylindrical‐gridded cathode in glow discharge regime through SOC phenomena through non‐linear time series analysis. The non‐linear temporal and spatial analysis of potential structure and dynamics of charged particles are correlated with SOC in cylindrical‐gridded cathode in glow discharge regime through the dynamics of multiple sheath structure formations. The existence of flicker noise and long‐range correlation in the time series suggests the existence of SOC behaviour in the system, the multiple sheath structures evolve through reduction and addition of layers. Cylindrical‐gridded cathode discharge initiation during formations of multiple sheath structures, switching of discharge regimes with anode potential, layer reduction and addition inside the sheath structures through SOC behaviour, renders uniqueness to the present regime of investigation. Self‐organised pattern formations and self‐organised criticality behaviour investigated in the present glow discharge regime using the cylindrical‐gridded cathode source are of prime importance to understand the complex behaviour of plasmas in the field of hollow cathode discharges.

show abstract

Section: Resultsmentioning

confidence: 99%

“…During the formations and collapse of such multiple sheath structures, the phase space trajectories suggest significant SOC behaviour in the present discharge regime. [ 12,26 ]…”

Section: Resultsmentioning

confidence: 99%

Study of self‐organised criticality in a coaxial plasma source with gridded cathode

Bose

Paul

2022

Contributions to Plasma Physics

View full text Add to dashboard Cite

show abstract

“…[ 1–5 ] However, in almost all of these cases, an ambient cathode plasma was produced by filament within a certain gas pressure range, in the absence of a magnetic field as well as in the presence of a magnetic field. [ 6 – 9 ] Self‐organized criticality (SOC) behaviour was investigated earlier during Double Layer (DL) formations in various confinement devices, mostly near the electrodes, [ 8,10,12 ] owing to its vital importance in the investigation and understanding of complexities in space plasma and fusion plasmas. [ 13 – 15 ] The SOC indicates the existence of self‐similarity in the discharge states and helps in understanding the fractal dimensions during such a discharge regime.…”

Section: Introductionmentioning

confidence: 99%

“…The nonlinear analysis of the Hurst exponent and the presence of 1/ f power law in the dynamical systems is the identification of the SOC behaviour resulting in the formation and dynamics of multiple potential structures and indicating the complexities of the plasma discharge during the formation of multiple potential structures. [ 8,12,16,17 ] The paper also presents a detailed analysis of the identification of coherent modes as well as the distribution of energy among them during the SOC behaviour of the discharge through the application of the Empirical Mode Decomposition (EMD) technique. [ 21 ] The statistical technique, Empirical Mode Decomposition (EMD), resolves a signal into its inherent modes and identifies them as intrinsic mode functions (IMFs).…”

Section: Introductionmentioning

confidence: 99%

Formation of multiple anodic fire spots inside an electrostatic cavity

Bose

Debnath

Paul

2022

Contributions to Plasma Physics

View full text Add to dashboard Cite

Charged particles exhibit self‐organized behaviour during the discharge state transitions inside an electrostatic cavity, along with the energy redistribution in different coherent modes with progressive anode potential. Multiple sheath formations around the spherical metallic ball anode placed inside the cavity transit to intensely glowing multiple anode spot formations (fireballs) on the anode surface with progressive anode potential. The intensely glowing anode spots reorganize over the anode surface and multiply quickly on increasing the anode potential. The nonlinear analysis of the fluctuating discharge current reveals the presence of self‐organized criticality (SOC) during different states of discharge along with a strong memory effect within (10–104) time lags in every state of discharge. The multiple anode spots exhibit long‐range correlation in the absence of a magnetic field, indicating SOC behaviour. The present study investigates energy distribution among the coherent modes of discharge through the application of the Empirical Mode Decomposition technique. The analysis indicates that the introduction of a magnetic field results in the interchange of coherent modes carrying most of the energy during multiple spot formations. The present experimental configuration produces stable multiple coherent modes along with the evolution of anodic sheath layers in the absence and then in the presence of the magnetic field. Relating SOC with such discharge transitions may help to understand the relation between complex structure formations in plasma with nonlinear aspects of glow discharge, which is of vital importance in the investigation of complexities in space plasma.

show abstract

“…Atomic-scale self-organized criticality propagates much like large-scale macroscopic phenomena such as earthquakes [13] and forest fires [14]. Some of the earliest work on the phenomenon of selforganized criticality focused on resilient, non-local properties of cold plasmas [15,16], and plasma structures confined magnetically or by pressure-gradient turbulence [17], as manifestations of SOC avalanche and transport dynamics. Recent experiments have found signs of selforganizing criticality in ultracold and room-temperature atomic Rydberg gases [18,19].…”

Section: Introductionmentioning

confidence: 99%

Radio frequency field-induced electron mobility in an ultracold plasma state of arrested relaxation

Wang,

Aghigh,

Marroquín

et al. 2020

Preprint

View full text Add to dashboard Cite

Penning ionization releases electrons in a state-selected Rydberg gas of nitric oxide entrained in a supersonic molecular beam. Subsequent processes of electron impact avalanche, bifurcation and quench form a strongly coupled, spatially correlated ultracold plasma of NO + ions and electrons that exhibits characteristics of self-organized criticality. This plasma contains a residue of nitric oxide Rydberg molecules. A conventional fluid dynamics of ion-electron-Rydberg quasi-equilibrium predicts rapid decay to neutral atoms. Instead, the NO plasma endures for a millisecond or more, suggesting that quenched disorder creates a state of suppressed electron mobility. Supporting this proposition, a 60 MHz radio frequency field with a peak-to-peak amplitude less than 1 V cm −1 acts dramatically to mobilize electrons, causing the plasma to dissipate by dissociative recombination and Rydberg predissociation. An evident density dependence shows that this effect relies on collisions, giving weight to the idea of arrested relaxation as a cooperative property of the ensemble.

show abstract

Self-organized criticality in a cold plasma

Cited by 11 publications

References 25 publications

Study of self‐organised criticality in a coaxial plasma source with gridded cathode

Study of self‐organised criticality in a coaxial plasma source with gridded cathode

Formation of multiple anodic fire spots inside an electrostatic cavity

Radio frequency field-induced electron mobility in an ultracold plasma state of arrested relaxation

Contact Info

Product

Resources

About