Development of theoretical model for 3D plasma energy behavior and characteristics

Khan²,

et al. 2020

Int J Energy Res

For the fast uptake into industrial applications, the further development of robust methods of nanomaterials, which are inexpensive and simultaneously technologically feasible, is one of the major key factors. A newly introduced atmospheric pulsed laser deposition method, based on a flowing gas approach, was used for plasmonic metal nanoparticle (NP) film of silver. Contrary to vacuum, in this method, the ambient air restricts expansion of the ablation plume within 1 to 3 mm above the target surface. These sets constrain on the formation of NP film close to the ablation spot. For deposition on a widely spaced surface, ablation material was entrained in a flow of argon, supplied at $32 ms −1 , and effectively delivered to the substrate at $20 ms −1. The films produced were crystalline and particulate in nature, showing spectral plasmonic feature of surface plasmon resonance in the visible region. The film was directly tested in surface-enhanced Raman spectroscopy for chemical detection of crystal violet; the film with large particulates and aggregated crystallites was well-performed, showing enhanced Raman signals and detection sensitivity. Certainly, flowing gas atmospheric pulsed laser deposition seems a fast alternative to vacuum-pulsed laser deposition but needs further investigations to bring it in the industry for applications in sensor, catalysis, solar cell, and coating technology.

Section: Resultsmentioning

confidence: 99%

Silver nanoparticle films by flowing gas atmospheric pulsed laser deposition and application to surface‐enhanced Raman spectroscopy

Khan²,

et al. 2020

Int J Energy Res

“…For tilting movement with selected degree cos(α), the higher values of 'r,' 'z' are defined by (±4.9, ±3.6), the higher values for radial magnetic field ranges are defined by (B r (max,up),B r (max,down)) = (0.3075, −0.4062) and the maximum values ranges for current of magnetic field are defined by (B x , B z ) max = (0.5747, 0.2525) as given in Table 5. By plasma energy integral (Khan et al, 2015), the whole plasma energy is 8.0570e+004. Therefore, we have observed if non-asymmetric halo current is controlled by non-asymmetric magnetic field points, then horizontal force during VDE should be directly proportional to non-asymmetric halo current.…”

Section: Results and Analysismentioning

confidence: 99%

Impurity transport and halo current effects on tungsten divertor system

Journal of Radiation Research and Applied Sciences

Alaswad

et al. 2020

This paper presents the development of theoretical model for the purpose to calculate and analyze halo and eddy current effects in the tungsten divertor of Tokamak (Fusion) reactor. In the first step, focal points for plasma energy, sideways forces (on the vessel), impurities, and halo-eddy current effects (in terms of poloidal and toroidal magnetic field orientations) were calculated. During the verge of point calculation, the research was extended to calculate the initial conducting point (halo current) for the tungsten divertor plate. Three cases were considered for investigating the plasma energy during upward and downward flows to the divertor plate. Poloidal and toroidal orientation of plasma energy were investigated and the theoretical model was developed. Initial conducting point with respect to (r,z) was calculated for halo current calculations and its derivatives. A mechanism for the development of the asymmetry and for estimating electromechanical loads was performed. For computational analysis, a Matlab program was developed to calculate and verify halo current and plasma energy calculation points. The main objective of the research is to develop a theoreticalcomputational model to evaluate plasma behavior and divertor system in any Tokamak reactor.

“…The interaction between blue and green lines perfectly goes smoothly (especially point A to B goes perfectly with small turbulence), while the red line makes some disturbances (decreasing and increasing in middle and down figure) in three cases in 2000-4000 ms and 6000-10000 ms. This behavior shows the change of magnetic field points during VDE down and changing of flux, which are more convenient in order to discuss the static and tilting position of plasma behavior [19,20].…”

Section: Results and Analysismentioning

confidence: 99%

Theoretical investigation of plasma dynamical behavior and halo current analysis

Song

2015

Int. J. Energy Res.

Self Cite

In this paper, a novel system has been developed for plasma disruption conditions followed by downward vertical displacement. During the disruption, size and orientation of plasma decreases, which gives the halo current circulated around each contacting point in radial as well as in poloidal directions. Therefore, a new mathematical model has been developed, which gives the interaction forces of halo current, vertical, and radial plasma dynamical behavior (linear and nonlinear). This theoretical approach showed that the tokamak plasma has two connecting points in order to distinguish between the stable and unstable position. This model can particularly give the magnetic field change points and changing of flux, which are more convenient in order to discuss the static and tilting position of plasma behavior. Numerical techniques have been calculated in terms of plasma dynamical behavior, that is, Electromagnetic/plasma, Vertical Displacement Event (VDE) stages, and initial interaction between the forces under specific time interval. The objective of the research is to developed theoretical and computational model in order to investigate the dynamical behavior of plasma under disruption conditions. This is the novel method, and no work has been reported so far.