Stellarator
Plasma diagnostics
The extreme conditions in a fusion plasma call for special measuring methods
for investigating it state – temperature, density, energy content,
currents in the plasma, impurities, etc. One generally tries to determine
the properties of the plasma without perturbing it by investigating the
effects exerted by the plasma on the outside. These are magnetic or electric
fields, charged or neutral particles, and electromagnetic waves which
the plasma emits in a wide spectral range from the radiofrequency to the
X-ray regions.
Besides these passive methods, active methods are also applied insofar as one can be sure that they do not change the plasma. A particularly rewarding technique is to beam in laser light or microwaves, which can be influenced by the plasma and thus provide information on its properties. Particle beams are also used for diagnostics. To avoid systematic measuring errors various methods are applied to measure the same physical quantity .
The diagnostic methods used in the tokamak and stellarator do not basically differ.
Besides these passive methods, active methods are also applied insofar as one can be sure that they do not change the plasma. A particularly rewarding technique is to beam in laser light or microwaves, which can be influenced by the plasma and thus provide information on its properties. Particle beams are also used for diagnostics. To avoid systematic measuring errors various methods are applied to measure the same physical quantity .
The diagnostic methods used in the tokamak and stellarator do not basically differ.
Plasma diagnostics
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