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The 42GHz Electron Cyclotron resonance Heating (ECRH) system is used in tokamaks Aditya and SST-1 to carry out ECRH related experiments at fundamental and second harmonic. The Gyrotron capable to deliver 500kW power for 500ms duration is commissioned in SST-1 tokamak hall and ∼75m long transmission line is laid to connect both the tokamaks. The corrugated waveguide (ϕ63.5mm) based transmission line...
ADITYA tokamak, an air-core, mid-sized (R0 = 75 cm, a = 25 cm) ohmically heated circular limiter tokamak, regularly being operated to carry out several experiments related to controlled thermonuclear fusion research. During recent operation campaign, special efforts are made to enhance the discharge performance as well as plasma parameters. Repeatable plasma discharges of maximum plasma current of...
In a very large vessel, maintain ultrahigh vacuum (UHV) is a challenge. The LIGO (Laser Interferometer Gravitational Wave Observatory vacuum envelope is one of the large vacuum chambers in the world. LIGO vacuum system consists of two arms of 4 km long beam tubes of 1.2 meter diameter. Ultrahigh Vacuum (UHV) environment is required to reduce residual gas phase noise to enhance accuracy of measurement...
Low temperature glow discharge wall conditioning (GDC) using H2 gas is effective in reduction of oxygen and carbon (low-Z) contain impurities on near surface region of vessel wall. The high retention of hydrogen in vessel wall/components due to long operation of H2 GDC increases hydrogen out-gassing during tokamak operation and affects the production of high temperature plasma. The hydrogen retention...
Adityatokamak is a limiter tokamak device with a torus vacuum vessel having square cross section. The existing Adityatokamakis being upgraded into a machine with divertor operation and good plasma control to support the future Indian Fusion program in a big way. Theup-gradation of Adityatokamak to diverter tokamakneeds additional magnetic field coils for diverter operation, close to the vessel. To...
In fusion devices, conditioning of vacuum vessel wall is important to get better plasma parameters. The impurities affect the plasma parameters such as density, temperature, and confinement time. Lithium coating on plasma-facing components is one of the techniques for wall conditioning to minimize the impurity level and to improve plasma parameters. In the ADITYA tokamak, we have performed a series...
The main causes of the energy losses in tokamak are radiation, ion-neutral charge exchange and plasma transport processes. Infrared thermography is carried out on the poloidal limiter of ADITYA tokamak with infrared camera Analysis of these thermographic images can enhance our understanding of plasma-limiter interaction. Surface temperature measurement can give us heat flux falling on limiter and...
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