Paul-Henri Rebut

Paul-Henri Rebut was born in 1935 in France. Public biographical notices from the Académie des sciences, EUROfusion and Wikipedia give the year of birth but not a verified day or month, so only the year is recorded here. He grew up in the generation that would staff France's post-war nuclear establishments. Little about his childhood or parental family has been published in the open sources used for this memorial.

Rebut studied physics at the École polytechnique in Paris (promotion 1955) and continued at the École des Poudres in 1957. He joined CEA fusion research in 1958 and completed a doctorat d'État in 1966. That combination of grandes-écoles training and doctoral work placed him among the first French cohort to treat magnetic confinement as both a theoretical and an engineering problem.

At CEA from 1958, Rebut worked on tearing modes, magnetic islands, chaotic field-line topology and disruption physics, publishing foundational papers from the early 1960s onward. He helped create the TFR tokamak at Fontenay-aux-Roses (1970-1973), then led JET design at Culham from 1973, became JET deputy director in 1979 and director in 1985. Under his direction JET set current records and, in November 1991, produced the first significant controlled DT fusion power. From 1992 to 1994 he directed ITER Design Activities in San Diego. Later roles included senior adviser to the European Commission, CEA high-commissioner adviser (1998-2003), ITER adviser (2007-2010), ISTC expert (2000-2004), and membership of the European assessment of the five-year fusion programme (2000). He also ran Rebut Consultant and argued publicly for hybrid fusion-fission reactors that would use 14 MeV neutrons more fully.

Rebut kept his private life largely out of the scientific press. Open sources used here do not name a spouse or children. Colleagues remembered him as a familiar presence at ITER Headquarters well into his seventies, still consulting on machine design and still ready to challenge what he called politically correct trends in fusion planning. Funeral arrangements announced after his death were held in central Paris at Église Saint-Paul-Saint-Louis.

Rebut believed controlled fusion would become essential to humanity's energy supply. In a 2009 ITER interview he recalled early discharges lasting a millisecond at about 100,000 °C, yet remaining certain fusion's contribution would one day be essential. He argued that ITER should aim at ignition rather than a reduced goal, calling the political compromise a historical mistake that cost decades. He also promoted hybrid fusion-fission concepts: using energetic fusion neutrons to drive fission in a uranium-238 or thorium blanket and multiply energy output by roughly a factor of ten, while still insisting that making ITER work remained the absolute priority. His 1999 book framed fusion as both the power of the stars and a technology that must be steered away from weapons toward civilian reactors.

Rebut's design choices for TFR and especially JET (D-shaped plasmas, high current capacity, hot first wall, remote handling) shaped every large tokamak that followed and fed directly into ITER. The 1991 DT result and later 16 MW campaigns proved that magnetically confined plasmas can produce significant fusion power. Theory contributions on tearing modes, ergodic field lines and confinement scaling remain cited in neo-classical tearing-mode and disruption research. The EPS Hannes Alfvén Prize laudation of 2006 summarised him as one of the most successful physicist-engineer-managers in magnetic confinement history. Through CEA, JET, ITER and the Académie des sciences he trained and influenced generations of European fusion scientists.

His distinctions include Chevalier de l'Ordre national du Mérite (1978), Chevalier de la Légion d'honneur (1984), corresponding membership of the Académie des sciences (elected 2 February 1987), the Prix de la Société française des électriciens (1969), the Grand prix Jean-Ricard of the Société française de physique (1981), the Esso Prize of the Royal Academy (UK, 1991), the Forum Engelberg Prize (Switzerland, 1993), and the Hannes Alfvén Prize of the European Physical Society Plasma Physics Division (2006).

Rebut's major general-audience book is L'Énergie des étoiles, la Fusion nucléaire contrôlée (Odile Jacob, 1 November 1999). He wrote technical reviews including "From JET to the reactor" (Plasma Physics and Controlled Fusion, 2006), "The Joint European Torus (JET)" (The European Physical Journal H, 2017), and ITER design papers such as "ITER: the first experimental fusion reactor" (Fusion Engineering and Design, 1995). French television archives (INA) preserve interviews from his JET years, including coverage of the 1991 DT experiment. ITER Newsline profiled him in December 2009 as "A man of unique experience."

Paul-Henri Rebut died on Tuesday 3 November 2026 in Paris. The Simplifia avis de décès published on 5 November 2026 announced funeral rites at Église Saint-Paul-Saint-Louis, 99 rue Saint-Antoine, 75004 Paris, on Monday 9 November 2026 at 10:30. The Académie des sciences updated his member page with the 2026 death year. The cause of death was not made public in the avis or in English and French Wikipedia notices consulted for this profile. He was about 91.