English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

During the initial phase of microwave (MW) power launch inside a MW dischargeion source (MDIS), plasma and the electric fields are evolved with timetogether in the plasma volume. The spatio-temporal evolution pattern in thecavity of a MDIS is reported here, highlighting the role of these electricfields on power coupling processes. Evolution of electric field and so powercoupling processes are calculated using Finite Element Method (FEM). UnlikePIC/MCC or hybrid fluid, here FEM model uses time dependent Poisson solverthrough drift-diffusion approach. In presence of plasma gradient in the volumeambipolar electric field is generated which interacts with the MW electricfield to form resultant total electric field which continuously vary duringthis evolution period. It is observed that main power coupling mechanism iselectron cyclotron resonance (ECR) method, however with the evolution ofplasma, the mode shifts from ECR to off-ECR type heating with time. Off-ECRheating in the form of upper-hybrid resonance (UHR) method, electro-static (ES)ion acoustic wave heating method are important heating mechanisms during theover-dense plasma condition, when density is above critical density forlaunched MW frequency, 2.45 GHz. An indirect verification of simulated temporalevolution of hot electron temperature and plasma density with the experiment,is done under similar configuration and operating environment. The experimentalresults are found to be agreed reasonably well with the simulation in the lowpower range.

Spatio-temporal evolution of electric field inside a microwave discharge plasma during initial phase of ignition and its effect on power coupling