ADITYA-U

Intelligence Summary: ADITYA-U

Node Identity: ADITYA-U is a medium-size air-core tokamak operated by the Institute for Plasma Research (IPR) in Gandhinagar, categorized under the Tokamak group in the India intelligence graph. It was upgraded from the original ADITYA tokamak in 2016, with first plasma achieved in December 2016. ADITYA-U represents India's workhorse plasma physics research platform, having been routinely operated since 2017 with approximately 200 kA maximum plasma current and 350 ms longest pulse duration.

Strategic Relevance: ADITYA-U serves as the foundational plasma physics training ground for India's fusion program, directly supporting the nation's ITER participation and the proposed SST-Bharat fusion-fission hybrid reactor. While IPR's tokamak program is genuinely civilian and research-oriented with no evidence of weapons-oriented plasma research within IPR itself, the broader DAE institutional architecture creates indirect strategic relevance. The same department (DAE) oversees IPR's tokamak program, BARC's nuclear weapons and KALI DEW programs, and ITER-India. Plasma physics expertise — disruption mitigation, runaway electron dynamics, plasma shaping — generated at ADITYA-U feeds into a knowledge base shared across DAE's civilian and military research ecosystem. ADITYA-U's experiments on electromagnetic particle injection for disruption studies and runaway electron suppression have potential dual-use relevance for pulsed power and plasma confinement applications.

Technical Focus / Capabilities: ADITYA-U specifications include a major radius of 0.75 m, minor radius of 0.25 m, maximum toroidal field of 1.5 T, designed for plasma current of 150-250 kA, duration of 250-350 ms, electron density of 1-5x10^19 m^-3, and electron temperature of 300-1000 eV. Recent research focus areas include sawtooth and MHD phenomena, runaway electron suppression, and preliminary plasma shaping with divertor coils. The tokamak operates with both hydrogen and deuterium fuels, with confinement improved by a factor of approximately 1.5 in deuterium plasmas versus hydrogen. The original ADITYA operated for 25 years with approximately 30,000 discharges before the 2016 upgrade, providing an extensive experimental database. ADITYA-U's performance is modest by international standards but sufficient for fundamental plasma physics research and ITER-relevant technology development.

Network Linkage: ADITYA-U maintains 4 documented connections: it is operated by IPR, succeeds the original ADITYA tokamak (upgrade of), and is itself succeeded by the proposed SST-Bharat fusion-fission hybrid. Through IPR, ADITYA-U connects to the DAE institutional nexus and ITER-India. The ADITYA-to-ADITYA-U-to-SST-Bharat progression represents India's tokamak development pipeline, with each generation building on the experimental database of its predecessor.