Divertor and Transport System for Fusion Device
Divertor and Transport System for Fusion Devices
Tech Area / Field
3 Approved without Funding
National Nuclear Center of the Republic of Kazakstan, Kazakstan, Kurchatov
- SPF "Technology", Russia, St Petersburg\nTRINITI, Russia, Moscow reg., Troitsk
- General Atomics, USA, CA, San Diego
Project summaryOne of the main tasks of the thermonuclear reactors is the investigation of the first wall constructional materials, pertors, screens, limiters etc. For this purpose, it is desirable to have a possibility to study the properties of these materials under conditions similar to real tokamak conditions.
One of the possible ways to solve this task is the use of modern research tokamaks. At present such experiments are carried out practically on all working tokamaks. Some of them, such as JET, JT-60, DIII-D, T-10 etc., have specially developed transport devices–manipulators with possibility to view, replace and repair the vessel constructional elements located in an active zone. However, these devices are not suitable for full scale material studies, so that the volume of the material studies does not match the problems to be solved.
Today it is developed specialized KTM tokamak for material studies (Kazakhstan Tokamak for Material testing), dedicated especially for constructional materials studies under conditions similar to ITER and future reactors.
The basic goals of the KTM tokamak are physical and material researches.
The material aspects of the KTM program are:
- Studies of materials behavior under intensive particles and energy fluxes, in particular, pertor tiles under the heat fluxes 0.1-20 MW/m2, pulse duration 1-5 s, pulse frequency 0.1 min-1.
- Tests of pertor tiles both heated up to 20-700 °C and water cooled, tests of the first wall coatings, limiter components etc.
The main principle of the KTM operation is creation and maintenance of a stationary regime during 5-10 s under additional 5 MW RF heating.
To fulfill large amount of material studies it is necessary to provide conditions for quick change of samples under tests without vacuum violation. For this purpose a transport device with sluice chamber and lift pertor device have been proposed.
The pertor device of the KTM tokamak is a table intended for allocation, fixing and exposure of elements receiving the plasma heat and corpuscular fluxes. It provides the positioning of replaceable elements of the pertor tiles along vertical direction from Z = -200 mm to Z = -980 mm and varying angle relative to the plasma flux. All pertor plates elements are changed through loading unit by means of the transport device and rotational mechanism of the pertor table. The angle variation of the pertor plates with respect to plasma flux is provided by means of adjustment of their position.
The transport sluice device is intended for displacement of the pertor samples into the operating zone of the vacuum chamber and their removal after exposure through a special vacuum installation. The transport sluice device can be used for diagnostics of the replaceable elements of the pertor without opening the main chamber to atmosphere.
During realization of the project the following works will be carried out:
1. Computer simulation of the shape and parameters of the main plasma column, current ramp up and ramp down scenarios. Computer simulation of mechanical structural strength and thermal regimes of the design elements.
2. Computer simulation of the heat and mechanical loads on the pertor elements taking into account the ITER pertor scalings. Calculations of the thermal regimes of the pertor plates.
3. Development of design and manufacturing of technological equipment for production and test of the elements prototypes:
- pertor device;
- transport device.
4. Manufacturing of the elements prototypes of the transport sluice and pertor devices and testing of prototypes:
- vacuum drive of the pertor device;
- replaceable block of the pertor device;
- vacuum input of conveyer drive of the transport sluice device.
5. Development of automation system of the pertor and transport sluice devices and it’s integration in the KTM automation circuit.