In 2008, experiments have been carried out in ASDEX Upgrade to compare Hmode power threshold and confinement time in helium and deuterium.A scan in magnetic field and a wide density variation indicate that the threshold power in the two gases is very similar.The density dependence of the threshold exhibits a clear minimum.Confinement in helium is about 30% lower than in deuterium, mainly due to the reduction of the ion density caused by Z=2 in helium.
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Ryter et al. (2009) studied this question.
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