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ADITYA Tokamak

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ADITYA, a medium size Tokamak, is being operated for over a decade. It has a major radius of 0.75m and minor radius of the plasma is 0.25m. A maximum of 1.2 T toroidal magnetic field is generated with the help of 20 toroidal field coils spaced symmetrically in the toroidal direction.

ADITYA is regularly being operated with the transformer-converter power system. Pulses longer than 100 ms with 80-110 kA plasma current at toroidal field of about 0.9 T is being regularly produced for various experiments. During this period experiments on edge plasma fluctuation, turbulence and other related works have been conducted. Standard diagnostics have been employed during these measurments.

From the time of original erection ADITYA has been upgraded gradually in various ways. Vacuum system now has three discharge cleaning systems : Glow Discharge Cleaning, Pulse Discharge Cleaning and Microwave Discharge Cleaning. In addition a number of in-situ surface coating methods have been developed. Many more diagnostics have been integrated and made on-line. Some new ones are in the design/fabrication phase.

To increase the plasma energy content during discharge, auxilary-heating system based on Ion Cyclotron Resonance Heating, is being used. A 20-40 MHz, 200 kW Ion Cyclotron Resonance Heating (ICRH) system has been integrated to ADITYA. A 28 GHz, 200 KW gyrotron based Electron Cyclotron Resonance Heating (ECRH) system has also been successfully commissioned on ADITYA tokamak. To gain hands-on experience with Lower Hybrid Current Drive (LHCD) system, a vital subsystem for our next machine SST-1, a plan to incorporate LHCD has also been taken up. This system is expected to be fully integrated soon. Some neutral network analysis to predict disruption and density limit on ADITYA has also been performed.

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