Differentiate between nuclear fission and fusion. How can India's experience with SST-1 and ITER position it in the global fusion race?

Nuclear energy can be released in two opposite ways: by splitting heavy nuclei (fission) or by joining light ones (fusion). India already generates power from fission. Its work on SST-1 and ITER is now giving it real capability in fusion as well.

Fission vs Fusion

Basis	Fission	Fusion
Process	A heavy nucleus (uranium) splits	Light nuclei (deuterium + tritium) merge [1]
Products	Radioactive fragments; long-lived waste	Helium (an inert gas) + a fast neutron [1]
Control	Self-sustaining chain reaction that must be controlled	No runaway chain reaction [1]
Conditions	A critical mass of fuel	About 100 million °C plasma, held away from the walls by magnets in a tokamak [1]
Status	Used by all current nuclear plants [1]	Experimental; electricity is "a further step away" [1]

How SST-1 and ITER position India

• Home-grown tokamak line: under DAE, India has more than three decades of fusion work, moving from ADITYA to ADITYA-U and then SST-1 [5].
• Superconducting magnet skills: SST-1 at IPR, Gandhinagar produced its first plasma on 20 June 2013 [3]. By 2015 it gave repeatable discharges of about 500 ms with plasma currents above 60 kA [4]. This built Indian skills in magnets and cryogenics (very low-temperature engineering) [2].
• Role in ITER: India is developing a Lead-Lithium Ceramic Breeder Test Blanket Module [3]. It also supplies the cryostat, cryogenic distribution, cooling water system and in-wall shield blocks [5].
• Industry ecosystem: these ITER parts were made by Indian industries, including many SMEs [5]. That base supports private entry: Bengaluru's Pranos Fusion has built the PRAGYA test tokamak and aims to finish the PRANIK design by 2027 [1].
• Global role: at the IAEA World Fusion Energy Group, India proposed fusion-fission hybrids to produce power or burn up radioactive waste [5]. This links fusion to India's fission programme.

Gaps to bridge

• SST-1 pulses of about 500 ms [4] are still far from true steady-state operation.
• Fusion electricity "would be expensive now" [1]. Private entry also needs clear rules for licensing and tritium handling.

SST-1 has given India hands-on engineering skills, and ITER has given it large-scale experience and a place in global work. Together they make India a credible contributor to the fusion race, though not yet a leader. A focused fusion mission, IPR–industry partnerships and clear regulation could turn this into lasting technology leadership, in line with SDG 7 and the goal of Atmanirbhar Bharat.