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National Fusion Laboratory (LNF)
Hosting Legal Entity
French Alternative Energies and Atomic Energy Commission
Gif-sur-yvette cedex, PO: 91191 (Undefined)
Av Complutense 40, Madrid, PO: 28040 (Spain)
Type Of RI
Coordinating Country
Current Status:
Operational since 1998
Scientific Description
The flexible heliac TJ-II is a plasma physics device oriented to Fusion Energy research. The heliac, from "helical axis" is a "stelllarator" device, ewhich differs from the mainline "tokamaks" in the way the cvonfining magnetic configuration is achieved. TJ-Ii is a mid size device, with a major radious of 4,5 m , a minor radius of 0,2 m and a magnetic field of 1 Tesla. It is located at CIEMAT, national centre for energy and environment research and operates in the framework of the Contract of association with EURATOM. This RI is an ICTS (Unique Scientific and Technological Infrastructure), included in the Spanish National Roadmap for RIs.

RI Keywords
Nonlinear physics, Plasma physics, Electromagnetism
RI Category
Nuclear Research Facilities
Scientific Domain
Physics, Astronomy, Astrophysics and Mathematics
High temperature plasma

The concept of service is not well suited to a fusion research experiment: users come to TJ-II with proposals for plasma experiments or proposals to test new instrumentation techniques.

Bolometry cameras

metal bolometers for tomography of the global radiation emission.

Laser Blow of injector

Injects selcted trace impurities, used for measurement of the particle confinement time.

Langmuir Probes

used to monitor edge parameters.

UV-Visible spectrometers

Monitoring of line emission from impurities.

microwave reflectometer

Several systems: swept frequency for electron density profile measurements, stationary frequency system for turbulence studies. Operates in the range 30-70 Ghz.

neutral particle analyzer

Determines the ion temperature from the energy distribution of escaping neutrals, generated by charge exchange reactions.

Lithium injector

used for edge spectroscopy oriented to measurement of electron density and temperature.

Thomson scattering system

Rubi laser based, uses two dimensional intensified camera. Obtains density and Temperature profile along a full plasma diameter.

fast visible cameras

able to measure in the range of 100.000 frames/s, used for turbulence studies.

Infrared interferometer

based on a CO2/HeNe dual system, provides line integrated electron density.

Soft X ray cameras

several linear cameras for tomography of the SXR emission, linked to the product of electron density and temperature.

microwave interrferometer

same as above, with a 140 GHz beam, useful for lower densities.

Microwave radiometer

20-60 Ghz radiomenter, measures the electron temperature.

Helium injector

used for edge spectroscopy oriented to measurement of electron density and temperature.

VUV specttrometers

Monitoring of line emission from impurities.

Doppler spectroscopy

measures plasma rotation, from line shift, and ion temperature, from line broadening.

heavy Ion beam Probe

Based on a Cesium beam at 200 KV , used for internal plasma potential measurments.

Date of last update: 01/03/2017
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