A5047014014- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Microwave Engineering and Waveguides
- Solar and Space Plasma Dynamics
- Fusion materials and technologies
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Laser-Plasma Interactions and Diagnostics
- Dust and Plasma Wave Phenomena
- Electromagnetic Simulation and Numerical Methods
- Astrophysics and Star Formation Studies
- Advanced Antenna and Metasurface Technologies
- Soil and Land Suitability Analysis
- Full-Duplex Wireless Communications
- Acoustic Wave Resonator Technologies
- Radioactivity and Radon Measurements
- Stellar, planetary, and galactic studies
- Electromagnetic Compatibility and Noise Suppression
- Particle Accelerators and Free-Electron Lasers
- Radio Frequency Integrated Circuit Design
- Groundwater and Watershed Analysis
Institute for Plasma Research
2016-2025
Homi Bhabha National Institute
2017-2024
Barkatullah University
2023
Siemens (United States)
2020
Siemens Healthcare (United States)
2020
Chaudhary Charan Singh University
2019
Bharati Vidyapeeth Deemed University
2016
University of Hyderabad
2014
Banaras Hindu University
2014
CEA Cadarache
2010-2013
A 20 MW/5 GHz lower hybrid current drive (LHCD) system was initially due to be commissioned and used for the second mission of ITER, i.e. Q = 5 steady state target. Though not part currently planned procurement phase, it is now under consideration an earlier delivery. In this paper, both physics technology conceptual designs are reviewed. Furthermore, appropriate work plan also developed. This design, R&D, installation a MW LHCD on ITER follows Scientific Technical Advisory Committee...
Electron cyclotron resonance (ECR) produced toroidal magnetized plasmas is investigated in a device named 'STARMA', an acronym for Simple Tight Aspect Ratio Machine Assembly, having major and minor radius of 10.4 cm 6.8 respectively with aspect ratio (A) ~ 1.5. The plasma formed using 6 kW magnetron based microwave source operating at 2.45 GHz, employing ECR techniques magnetic field ~875G. unique property this ensures large variation (from 2 kG to 0.4 kG) across the poloidal cross section...
A new ITER-relevant lower hybrid current drive (LHCD) launcher, based on the passive-active-multijunction (PAM) concept, was brought into operation Tore Supra tokamak in autumn 2009. The PAM launcher concept designed view of ITER to allow efficient cooling waveguides, as required for long pulse operation. In addition, it offers low power reflection close cut-off density, which is very attractive ITER, where large distance between plasma and wall may bring density front values. first...
Several experiments, related to controlled thermonuclear fusion research and highly relevant for large size tokamaks, including ITER, have been carried out in ADITYA, an ohmically heated circular limiter tokamak. Repeatable plasma discharges of a maximum current ~160 kA discharge duration beyond ~250 ms with flattop ~140 obtained the first time ADITYA. The reproducibility has improved considerably lithium wall conditioning, are by precisely controlling position plasma. In these discharges,...
Lower hybrid current drive (LHCD) experiments with line-averaged density varying between 1.5 × 1019 and 6 m−3 are performed on the Tore Supra tokamak under quasi-steady-state conditions respect to fast electron dynamics. The LHCD efficiency is analysed from bremsstrahlung (FEB) cyclotron emission (ECE). effect of plasma equilibrium particle fuelling documented. It concluded that decay FEB could be consistent simple scaling FEB. Plasma edge measurements presented looking for emission. In a...
Lower hybrid current drive (LHCD) experiments performed at a density close to that required for the steady-state (SS) scenario are reported. On C-Mod, FTU and Tore Supra, strong decay of bremsstrahlung emission is observed when increased, much faster prediction LHCD modelling. JET, LH power deposition also found be sensitive plasma density: modulation indicates moves very edge (r/a ∼ 0.9) approaches requirement JET SS scenario. From this experiment but from reconstruction electron cyclotron...
A steady state superconducting tokamak (SST-1) has been commissioned after the successful experimental and engineering validations of its critical sub-systems. During 'engineering validation phase' SST-1; cryostat was demonstrated to be leak-tight in all operational scenarios, 80 K thermal shields were uniformly cooled without regions 'thermal runaway hot spots', toroidal field magnets their nominal conditions charged up 1.5 T at major radius. The further assembled SST-1 machine shell a...
Fully non-inductive operation with lower hybrid current drive (LHCD) in the Tore Supra tokamak is achieved using either a fully active multijunction (FAM) launcher or more recent ITER-relevant passive (PAM) launcher, both launchers simultaneously. While antennas show comparable experimental efficiencies, analysis of stability properties long discharges suggest different profiles. We present comparative modelling LHCD two to characterize effect respective antenna spectra on driven profile....
The sustainment of steady-state plasmas in tokamaks requires efficient current drive systems. Lower Hybrid Current Drive (LHCD) is currently the most method to generate a continuous additional off-axis toroidal plasma as well reduce poloidal flux consumption during ramp-up phase. operation Tore Supra ITER-like LH launcher has demonstrated capability couple power at densities with very low reflected long pulses. In addition, installation eight 700kW/CW klystrons transmitter allowed increasing...
Parametric characterization of multiple double layers is done during high pressure glow discharge in a toroidal vessel small aspect ratio. Although (without magnetic field) known to be independent device geometry, but the boundary conditions are conducive plasma growth and eventually occupy volume partially. At higher anode potential, visibly glowing spots on body spatially extended transform into intensely luminous spherical blob structures attached tip positive electrode. Dynamics observed...
Abstract To drive plasma current non inductively, a Lower Hybrid Current Drive (LHCD) system with passive-active multijunction (PAM) antenna for injecting lower hybrid wave (LHWs) has been designed, fabricated and to be integrated ADITYA-U Tokamak. A fast electron population in the energy range of few keV several hundreds is generated injection LHWs. These electrons interacting mainly ions result Hard X-Ray (HXR) emission called Fast Electron Bremsstrahlung acronym as FEB emission. single...
Detailed measurements of density and floating potential in the poloidal cross section a toroidal plasma with an extended source at minor axis are presented first half paper. The second part deals effect k/sub /// on curvature-induced low frequency (< omega i, ion gyro frequency) fluctuations, where is wavenumber parallel to ambient magnetic field. variation introduced help weak vertical field, which helps varying length field lines. We report reduction fluctuation level presence
A regulated high-voltage power supply (RHVPS) and its results are presented for initial integration operation with lower hybrid current drive (LHCD) system. Experimental shown to show the ability of RHVPS as a practical source electrical LHCD. Klystron is operated at 3.7 GHz. continuous wave RF level 500 kW various subsystems. has proven capability feeding klystron safe good required quality. Up 65 kV load in excess 18 was imparted trapezoidal pulse voltage. Repeatability by successive shot...
The aim of the Tore Supra tokamak is to address physics and technology issues long pulse discharges. For this purpose, equipped with two actively cooled Lower Hybrid Current Drive (LHCD) antennas (f = 3.7GHz), designed operate in 1000s pulses. One these recently installed passive active multijunction (PAM) antenna, whose design chosen for an LHCD system ITER. first experiments PAM antenna have shown extremely encouraging results terms reflection coefficient behaviour power handling. maximum...
The scope of this paper focuses upon a method generating electrical energy from the application specially designed treadmill with provision washing machine, which will work when human runs over for exercise is an integral part modern society life. In proposed model, permanent magnet dc generator 1200 W rating used produce power, can be further utilities and small power applications. machine system involves tub type arrangement connected to via gearbox system. produced by execution...
To operate superconducting steadystate tokamak (SST1) for 1000 seconds, lower hybrid current drive (LHCD) system has been designed at a frequency of 3.7 GHz., which would couple 1.0 MW CW microwave power to the shaped plasma. The consists various rf passive components and transmission line, employing from source is transported antenna. During calibration it was observed that losses in line substantial eventually lead less coupled Further anticipated more LH be required advanced operation...
This paper focuses upon an approach to generate the electrical energy from wind by mounting specially designed turbines on roof of moving rail locomotives (trains). In this work, three blade turbine system constructed using aerofoil is proposed. proposed model, arranged in bus bar arrangement. The power developed implementation aforementioned design used fulfil all requirements for appliances a train coach (tube lights, fans etc). aim research exploit kinetic air generation energy,...