Researchers from the National Institutes of Natural Sciences National Institute for Fusion Science have created a high-energy heavy ion beam probe that will be useful for measuring high-temperature plasma produced in the Large Helical Device (LHD) within the Institute.
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The researchers partnered with scientists from Kyushu University’s Research Institute for Applied Mechanics, and they teamed together to create abrupt excitation of fluctuations – thereby explaining the dynamics behind the phenomenon.
In both the journal Physical Review Letters and the journal of the American Institute of Physics are published two research papers on this subject on January 8, 2016. These papers were titled “Strong destabilization of stable modes with a half-frequency associated with chirping geodesic acoustic modes in the Large Helical Device,” and “Nonlinear excitation of subcritical instabilities in a toroidal plasma.”
In order to obtain nuclear fusion, there are ongoing experiments with high-temperature plasma of over 1 million degrees Celsius around the globe. Plasma loss sometimes occurs when excitation of fluctuations abruptly happens with large amplitude – only in magnetically confined plasma. This phenomenon impacts on how nuclear fusion reactor performs.
However, damage to the surrounding construction material could result, explaining the dynamics behind the excitation. Abrupt phenomena also sometimes happen in cosmic plasma, and within this solar flares usually emerge. The only problem is that scientists do not fully understand why large events occur.
The research team of Dr. Takeshi Ido of the National Institute for Fusion Science collaborated with Dr. Sanae-I. Itoh of Kyushu University’s Research Institute for Applied Mechanics and his group to develop a theoretical framework upon which this phenomenon can be explained and reasoned out.
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They were able to recreate experimental results via several numerical simulations that confirmed their theories, and this helped them to discover abrupt excitation of fluctuations – which had remained unknown before this time; and the scientists were now able to explain the dynamics of this phenomenon and to predict its excitation.