On multiple complex structure formations in expanding hollow cathode discharge

Bose, Subhojit; Chakraborty, Shamik; Nath, A.; Paul, Manash Kumar

doi:10.1007/s12043-021-02223-9

Cited by 2 publications

(14 citation statements)

References 33 publications

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“…The effective area of the anode rod is much smaller than the semi‐transparent mesh source, the asymmetric plasma source generates diverging electric field. [ 17–19 ] In the present case, pd = 0.375 Torr. cm., where p is the gas pressure and d is the diameter of the gridded cylindrical cathode.…”

Section: Experimental Setup and Diagnosticsmentioning

confidence: 62%

“…It is observed from the plasma potential profiles in Figure 4 as well as confirmed by the floating potential profiles. [ 19 ] The oscillatory variations of plasma potential in radial and axial directions, measured at V A ∼ 550 V in regime II, are shown in Figure 5a,b respectively. The plasma potential variation, resulting in spatial potential variation in the radial (r) direction, indicates the accumulation of charges near the mesh surface at r ≈ ± 2.5 cm.…”

Section: Resultsmentioning

confidence: 99%

“…In the critical state of discharge, maximum plasma potential near the mesh surface indicates the ion‐sheath developed near the mesh surface, supported by the floating potential profiles. [ 19 ] The accumulation of ionic charges near the mesh surface turns it into a ‘virtual anode’. [ 19 ] Thus, during the critical state of discharge, the localised charged particles quickly move towards the vessel walls to form a space charge layer near the wall.…”

Section: Resultsmentioning

confidence: 99%

“…[ 19 ] The accumulation of ionic charges near the mesh surface turns it into a ‘virtual anode’. [ 19 ] Thus, during the critical state of discharge, the localised charged particles quickly move towards the vessel walls to form a space charge layer near the wall. In regime I, the discharge passes through aperiodic oscillations in the time series of discharge current oscillations as depicted in Figure 6a‐i, also revealed by the fast Fourier transformation (FFT) of the time series in Figure 6a‐ii.…”

Section: Resultsmentioning

confidence: 99%

“…The ions control the electron motion to maintain the quasineutrality in this regime of discharge. Consequently, the mesh surface acts as a virtual anode [ 19 ] resulting in the global potential oscillations in the plasma inside the vessel, as evident from the frequency spectrum in Figure 6d. Thus, the local sheath oscillations in regime I later turn into global sheath oscillations in regime II (during critical state).…”

Section: Resultsmentioning

confidence: 99%

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

Bose

Paul

2022

Contributions to Plasma Physics

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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.

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Section: Experimental Setup and Diagnosticsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

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

Bose

Paul

2022

Contributions to Plasma Physics

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Formation of multiple anodic fire spots inside an electrostatic cavity

Bose

Debnath

Paul

2022

Contributions to Plasma Physics

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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.

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On multiple complex structure formations in expanding hollow cathode discharge

Cited by 2 publications

References 33 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

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