INTOR

INTOR
Name	INTOR
Caption	Conceptual layout of INTOR tokamak design
Type	International fusion reactor design study
Country	International
Year	1979–1988
Status	Conceptual design study

INTOR

INTOR was an international conceptual design study for a magnetic confinement fusion device based on the tokamak configuration, initiated to synthesize technical, scientific, and policy knowledge from multiple national programs. It sought to bridge efforts by bringing together expertise from leading laboratories and agencies to define requirements for an experimental reactor that would demonstrate reactor-relevant plasma conditions and technologies. The project influenced subsequent projects and programs in fusion research by codifying shared objectives for plasma physics, materials science, and reactor engineering.

Introduction

The INTOR project united major laboratories and agencies such as the International Atomic Energy Agency, European Commission, Joint European Torus, Culham Laboratory, École Polytechnique, Oak Ridge National Laboratory, Lawrence Livermore National Laboratory, Princeton Plasma Physics Laboratory, Max Planck Institute for Plasma Physics, Kurchatov Institute, CEA (France), and Japan Atomic Energy Research Institute to assess a path toward a near-term experimental fusion reactor. INTOR synthesized contributions from researchers including senior figures associated with Andrei Sakharov-era Soviet programs, leaders in the U.S. magnetic fusion program, and European tokamak teams linked to projects like JET and WEST. The study operated during a period marked by parallel initiatives such as the Large Helical Device planning and early discussions that eventually led to ITER.

History and Development

The initiative emerged in the late 1970s as part of international efforts to coordinate post-JET strategy and to provide a common technical basis for a device between university-scale machines and a full-scale demonstration plant. Workshops and technical meetings were held at centers like IAEA headquarters, Culham facilities, and national laboratories including ORNL and PPPL. The INTOR timeline encompassed progressive reports and design iterations influenced by operational results from tokamaks including JT-60, T-15, TFTR, and DIII-D. Political stakeholders such as representatives from the US Department of Energy, European Atomic Energy Community, Ministry of International Trade and Industry (Japan), and Soviet ministries participated in steering committees. Technical reviews incorporated input from specialists associated with ANS, IEEE, and the American Physical Society's Division of Plasma Physics.

Design and Technical Features

INTOR's conceptual design emphasized a tokamak with parameters intended to explore steady-state operation, tritium breeding, and power handling. The study examined magnetic confinement systems informed by superconducting magnet developments at institutions like ITER Organization precursor groups, KfK, and CEA. Plasma-facing components and first-wall materials were evaluated drawing on materials research at Sandia National Laboratories, Argonne National Laboratory, ENEA, and RIKEN. Diagnostics and heating systems were compared to technologies in use on ASDEX, JT-60U, COMPASS, and TEXTOR, and included neutral beam injection, radio-frequency heating, and bootstrap current considerations similar to those developed at ORNL and PPPL. Engineering assessments treated vacuum vessel geometry, remote maintenance inspired by experience at JET and TFTR, and tritium handling informed by expertise from EURATOM laboratories and Japanese facilities.

Project Objectives and Research Goals

Primary objectives included achieving fusion-relevant plasma conditions—temperature, density, and confinement time—necessary to test concepts for reactor regimes pioneered on machines such as JET and TFTR. INTOR aimed to study tritium self-sufficiency via blanket designs influenced by research from Sandia, Studsvik, and Winfrith-associated programs, and to evaluate neutronics and activation issues akin to analyses undertaken at OECD/NEA. Other goals encompassed demonstration of remote maintenance techniques developed in collaboration with teams at CEA and Süddorf-linked industrial partners, validation of superconducting coil manufacturing methods pioneered at Siemens and Westinghouse research groups, and development of safety and licensing frameworks drawing on precedents from Regulatory bodies in France, United Kingdom, and United States.

International Collaboration and Organization

INTOR was managed through multinational committees comprising scientists and administrators from the IAEA, national laboratories such as ORNL, PPPL, JAEA-affiliated centers, and European entities linked to EURATOM. The organizational model fostered data-sharing protocols and joint working groups patterned after cooperative arrangements used in projects like JET and later ITER. Funding and resource commitments were negotiated among ministries and agencies including the US Department of Energy, Japan Ministry of Education, Culture, Sports, Science and Technology, and European national research councils. The study served as a platform for exchange between industrial partners—machine builders and materials suppliers operating in West Germany, France, Italy, and Japan—and academic centers including MIT, University of California, San Diego, University of Tokyo, and École Polytechnique.

Legacy and Impact on Fusion Research

Although INTOR did not proceed to construction, its consolidated design studies influenced the technical and institutional groundwork for subsequent initiatives, most notably the conceptual evolution leading to ITER and engineering approaches in devices like NET proposals and national projects such as JT-60SA. INTOR's reports informed plasma physics research directions pursued at JET, TFTR, and DIII-D, and shaped blanket, tritium breeding, and materials testing programs executed at facilities like ITER Test Blanket Module programs, IFMIF conceptual studies, and neutron source proposals at EURATOM centers. The collaborative model demonstrated by INTOR persisted, encouraging multinational coordination exemplified by later consortia involving EUROfusion, Japan, Russia, and United States partners.

Category:Fusion devices Category:International scientific projects