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Fusion Science and Technology
Latest News
Zap Energy hits 37-million-degree electron temperatures in compact fusion device
Zap Energy announced April 23 that it has reached 1-3 keV plasma electron temperatures—roughly the equivalent of 11 to 37 million degrees Celsius—using its sheared-flow-stabilized Z-pinch approach to fusion. Reaching temperatures above that of the sun’s core (which is 10 million degrees Celsius temperature) is just one hurdle required before any fusion confinement concept can realistically pursue net gain and fusion energy.
N. Momoshima, S. Sugihara, T. Toyoshima, Y. Nagao, M. Takahashi, Y. Nakamura
Fusion Science and Technology | Volume 54 | Number 1 | July 2008 | Pages 293-296
Technical Paper | Environment and Safety | doi.org/10.13182/FST08-A1816
Articles are hosted by Taylor and Francis Online.
Tritium and major ion concentrations in rain were analyzed in Kumamoto, Japan between 2001 and 2006 to examine present tritium concentration and seasonal variation. The average tritium concentration was 0.36 ± 0.19 Bq/L (n=104) and higher tritium concentrations were observed in spring than the other seasons. Among the ions, non-sea-salt (nss) SO42- showed higher concentration in winter while other ions did not show marked increase in winter. Based on the back-trajectory analyses of air masses, the increase in tritium concentrations in spring arises from downward movement of naturally produced tritium from stratosphere to troposphere, while the increase of the nss-SO42- concentrations in winter is due to long range transport of pollutants from China to Japan.