Abstract
Optimization of the pre-ionization phase is a necessary step before switching to the main tokamak operation. Langmuir probe and optical emission spectroscopy are among the prime plasma diagnostic techniques to realize practically the changes that occurred in floating potential, electron temperature, electron number density, and impurity concentration. Triple Langmuir probe (TLP) collects the time-resolved plasma parameters to visualize the real-time evolution of the ECR heated pre-ionized hydrogen plasma zones. The temporal profiles of the floating potential, electron temperature, and number density show significant dependence on the hydrogen fill pressure. The sequential imaging of the electron cyclotron resonance (ECR) heated plasma zones displays their growth and progression. At lower fill pressure, plasma imaging illustrates the two distinctive ECR heated plasma zones corresponding to the first and second harmonics. The studies provide insights into the physics of preferential plasma heating in space and time-varying magnetic fields producing ECRH zones.
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