You are here: Home / Infrastructures / Res. Infrastructure
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, Electromagnetism, Plasma physics
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.

fast visible cameras

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

Helium injector

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

UV-Visible spectrometers

Monitoring of line emission from impurities.

Doppler spectroscopy

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

Langmuir Probes

used to monitor edge parameters.

heavy Ion beam Probe

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

VUV specttrometers

Monitoring of line emission from impurities.

Lithium injector

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

Soft X ray cameras

several linear cameras for tomography of the SXR emission, linked to the product 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.

Microwave radiometer

20-60 Ghz radiomenter, measures the electron temperature.

Infrared interferometer

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

Laser Blow of injector

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

microwave reflectometer

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

Bolometry cameras

metal bolometers for tomography of the global radiation emission.

microwave interrferometer

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

neutral particle analyzer

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

Date of last update: 01/03/2017
Printable version