IPR Reports 82.6 GHz Gyrotron Commissioning and Plasma Heating on SST-1
The system reached 400 kW for 500 milliseconds on a dummy load before plasma experiments at lower power and shorter durations. This is a heating-system milestone, not a fusion-power result.
Manik Gupta
Founder and editor of DeepTech India. Manik writes about India's frontier technology ecosystem — AI, semiconductors, space, quantum, robotics and biotech — translating research and policy into clear, reliable reporting.
Backlog edition: 2026-09-19. Reviewed on 20 September 2026.
The Institute for Plasma Research has reported commissioning an 82.6-gigahertz gyrotron and integrating it with the SST-1 tokamak. Its September 2026 newsletter describes both a high-power test on a dummy load and subsequent experiments heating plasma.
The distinction between those two stages is essential. The source reached its rated 400 kilowatts for 500 milliseconds on a water-cooled dummy load. During the reported plasma experiments, power ranged from 150 to 300 kilowatts and pulses lasted 75 to 200 milliseconds. The 500-millisecond figure is half a second, not a long-duration fusion run.
Delivering microwave power to the plasma
An electron cyclotron resonance heating system combines a microwave source, transmission equipment and a launcher that directs power into the tokamak. IPR reports connecting the gyrotron to SST-1 through an approximately 20-metre transmission line and realigning launcher mirrors.
The newsletter reports operation near a 2.8-tesla toroidal magnetic field and second-harmonic pre-ionisation at 1.5 tesla, alongside lower-hybrid current drive. These are results from the institute's experimental account; they do not establish net electricity production or a commercially operating reactor.
A subsystem result with a clear next test
Commissioning makes a heating tool available to researchers. Its scientific value lies in the experiments it enables: controlling where energy is deposited, studying plasma start-up and comparing behaviour under specified operating conditions.
Follow-up reporting should distinguish source output from power coupled to the plasma, and pulse duration from overall experimental campaign length. Neither a frequency nor a peak-power figure alone measures a fusion device's energy balance.
The milestone appears in the institute's September newsletter. The reviewed primary account does not specify a 10 September commissioning date, so that date is not presented as the event date here.
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