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Mechanical Strength of Magnet Systems for Stellarator


Strength Analysis of Magnet System and Cryostat, Running Tests and Development of Conceptual Design of Mechanical Monitoring System of W7-X Magnet System

Tech Area / Field

  • FUS-MCS/Magnetic Confinement Systems/Fusion
  • PHY-SSP/Solid State Physics/Physics
  • PHY-STM/Structural Mechanics/Physics

3 Approved without Funding

Registration date

Leading Institute
NIIEFA Efremov, Russia, St Petersburg


  • Max-Plank-Institut für Plasmaphysik, Germany, Garching

Project summary

The Project objectives are to carry-out the complex investigations of mechanical strength of the projected facility Wendelstein 7-X (W7-X). Topicality of these works is due to necessity to provide safety and reliable operation of the facility.

Due to the high cost of the facility W7-X equipment and expensiveness of supposed experiments, special attention is paid to modeling mechanical behavior of the facility, to carrying-out structural analysis of the most loaded elements and to test operation and calibration of sensors used for monitoring in conditions imitating operating conditions of the main facility systems. At that all limitations and demands to this facility systems design are taken into consideration.

The following goals and objectives of the ISTC will be realized as the result of Project accomplishment:

  • opportunity will be provided for employees of NIIEFA with previous weapons expertise to engage in output of production for peaceful purposes;
  • applied investigations will be supported, the final goal of which is to carry out complex investigation of mechanical strength of the projected facility Wendelstein 7-X;
  • transition to civil market economy will be supported.

Scope of activities. The work comprises two large pisions. They are:
  • Carrying out the complex investigation of mechanical strength and thermo-hydraulic state of the magnet system and the cryostat.
  • Development of a conceptual design of a system for monitoring of the stress-strained state of the W7-X magnet system, including experimental investigation of laser distometers, strain and acoustical sensors in magnet fields at cryogenic temperatures.

In the framework of the ISTC Project the following computation, research and design works will be done:
  1. Structural analysis of magnet system components
  2. Structural analysis of cryostat components
  3. Analysis of the magnet system at fault conditions
  4. Fast fracture analysis for the magnet system structure
  5. Development of a conceptual design of the mechanical monitoring system of the magnet system
  6. Calibration of strain, distance and acoustic sensors at cryogenic temperatures and magnetic field up to 8T
  7. Parametric studies on the thermal behavior of the non-planar coils of W7-X in case of loss of casing cooling

Work is completed with issuing a final technical report.

Cooperation with foreign collaborators is perceived to be in the form of:

  • exchange of information in the course of the project realization;
  • preparation of comments for the technical reports submitted to ISTC;
  • cross examinations of the results obtained in the project progress;
  • participation in technical inspection of the activities under the Project undertaken by the ISTC employees;
  • carrying out joint technical meetings.

Technical approach and methodology.

The technical core of the work is to analyze in details strength state of the W7-x main systems and to analyze their critical states as well as to prepare a system for monitoring mechanical state of the facility. The work has a complex nature and it includes two pisions, each of them being characterized by their specific approaches and methods of goals achieving.

  1. Design-theoretical structural analysis of the magnet system and the cryostat components, parametric analysis of thermal behavior of non-planar coils in case of loss of casing cooling, as well as the analysis of the magnet system at fault conditions and the possibility of fast fracture of the magnet system structure. At carrying out of this class of works there will be used as standard, accepted in mechanics computation models and original ones developed by the Project team and approved before.
  2. Development of conceptual design of the mechanical monitoring system of the magnet system, including calibration of strain, distance and acoustic sensors at cryogenic temperatures and magnetic field up to 8T. There will be used methods and techniques accepted in experimental mechanics, mainly in strain measuring.


The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.


ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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