For decades, scientists have been trying to solve a problem that the Sun handles naturally: how to produce enormous amounts of energy from nuclear fusion and keep the process under control.
India has now strengthened that effort with a major equipment upgrade at its experimental fusion facility in Gujarat. A new 82.6 GHz, 400 kW gyrotron has been installed and commissioned on the SST-1 tokamak at the Institute for Plasma Research.
The machine will give researchers a more powerful way to heat the plasma inside SST-1 and study how it behaves under extreme conditions.
Making fusion conditions on Earth
The Steady State Superconducting Tokamak (SST-1) is an experimental machine built to study fusion — the same basic process through which stars release energy.
Inside the tokamak, scientists create an electrically charged gas known as plasma. It has to be heated to extraordinary temperatures while being kept away from the walls of the machine.
The Sun can hold its plasma together through its immense gravity. A tokamak has no such advantage, so researchers use strong magnetic fields instead.
More than 200 million°C
Indian experiments have already pushed plasma temperatures beyond 200 million°C. That is roughly 20 times hotter than the temperature at the centre of the Sun.
But reaching such a temperature does not mean fusion power has been solved.
Scientists also need to understand how to keep the plasma steady and confined for longer periods. Any major disturbance can interfere with the experiment.
Why the new gyrotron matters
The latest upgrade is designed to help with this challenge.
A gyrotron is a specialised device that generates powerful, high-frequency microwave energy. That energy is directed into the plasma to raise its temperature and help sustain the conditions needed for fusion research.
The new unit operates at 82.6 GHz and 400 kW, giving SST-1 a stronger heating capability than its earlier 42 GHz system.
This should allow researchers to investigate hotter plasma and study its behaviour for longer durations.
Fusion is still a long way from the grid
The term “artificial Sun” makes the experiment sound closer to a power station than it actually is.
SST-1 is not currently generating electricity through fusion, and the new gyrotron does not turn it into a commercial reactor.
The immediate goal is research: learning how to create and control the extreme environment required for fusion.
If scientists can eventually overcome these challenges, fusion could become a major source of low-carbon energy. Unlike conventional nuclear fission, fusion is expected to produce much less long-lived radioactive waste, while its potential fuel sources are widely available.
The bigger challenge is control
India’s latest upgrade is therefore not about switching on a new source of electricity. It is about improving the tools needed to understand one of the hardest problems in fusion science.
Getting plasma incredibly hot is one achievement. Keeping it stable, contained and usable for sustained fusion is the real test.
The new gyrotron gives Indian researchers another piece of that puzzle — bringing the country a little closer to understanding whether the power that drives the stars can eventually be controlled here on Earth.
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