GEMS ENGINEERING LTD.

GEMS ENGINEERING LTD.

is an engineering SME specialized for the R&D market and offering innovative engineering and managerial solutions for projects involving substantial amounts of human expertise. We are supplying solutions covering the whole development process: from conceptual through final designs up-to prototype manufacturing, testing and installation of the final product.

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> Completed projects

Completed projects

The ITER device, currently under construction in the south of France, will study the potential of controlled nuclear fusion to provide energy for mankind. In order to study the behaviour of this device, a set of monitoring systems (referred to as Diagnostics) is required. These Diagnostics will provide the information required to understand the performance of the device.

GEMS Engineering is deeply involved in and fully devoted to the success of the ITER project. As a result, our main reference works are in connection with ITER, and - more closely - to its diagnostic systems.

Tests of locking mechanisms for ITER

Induction heating of the bolt samples. A total of 15000 thermal cycles were performed between 100 and 200 °C
Induction heating of the bolt samples. A total of 15000 thermal cycles were performed between 100 and 200 °C
Different kinds of fasteners are used in ITER for the fixation of functional and structural in-vessel diagnostic components. The fasteners should retain initial tightening preload in vacuum under neutronic irradiation, thermal cycling and vibrations. These conditions can lead to incidental unscrewing of some bolts and nuts if they are not locked properly. They shall be equipped with some locking features which in most cases shall be remote handling compatible. One of the candidates on a role of a locking mechanism is Spiralock type thread. Custom designed so called First Wall Samples (CuCrZr) with M16 fine thread and standard M8 bolts (316L) were the subject of our studies. ITER-like thermal cycling alternating with vibration tests were applied to the components. Fasteners' loosening was monitored via periodic torque audits. For comparison with the Spiralock thread, tests with normal metric threads were also performed under the same experimental conditions.

Latest news

Jigs for the alignment of the tangential and normal outer vessel steady state magnetic sensors
Project completed!
[24 August 2018] The task has been accomplished for ITER. We have closed this project.
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Major references

GEMS Engineering is deeply involved in and fully devoted to the success of the ITER project. As a result, our main reference works are in connection with ITER, and - more closely - to its diagnostic systems.

The ITER device, currently under construction in the south of France, will study the potential of controlled nuclear fusion to provide energy for mankind. In order to study the behaviour of this device, a set of monitoring systems (referred to as Diagnostics) is required. These Diagnostics will provide the information required to understand the performance of the device.

Infrastructure development for in-vessel diagnostic signal transmission
Infrastructure development for in-vessel diagnostic signal transmission
The Erosion Deposition Monitor under the divertor dome in ITER
The Erosion Deposition Monitor under the divertor dome in ITER
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