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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.
Owen N. Jarvis, Pieter Van Belle, Malcolm A. Hone, Guy J. Sadler, G. A. H. Whitfield, F. Edward Cecil, Douglass S. Darrow, Basilio Esposito
Fusion Science and Technology | Volume 39 | Number 1 | January 2001 | Pages 84-95
Technical Paper | doi.org/10.13182/FST01-A154
Articles are hosted by Taylor and Francis Online.
Two screened, thin-foil charge collectors were mounted just beyond the plasma edge at an outboard position (below midplane) in the Joint European Torus to detect lost alpha particles during the 1997 high fusion power D-T experiments. No convincing observations of alpha-particle collection were obtained, possibly because of the low level of alpha-particle losses but more probably because the positioning of the detector was not ideal for the high fusion power discharges that were run at high plasma current and toroidal field. Under such conditions, alpha particles on escaping orbits leading toward the detector are highly likely to be intercepted by the nearby poloidal limiter. Moreover, a small alpha-particle signal would have been obscured by interference from a large and unexpected signal attributed here to fast neutrals, leaving the plasma and ionizing in the low density scrape-off region outside the plasma boundary. The interpretation of this unexpected signal is discussed. In all probability, it will also be encountered in any future attempts to detect lost alpha particles in a current measuring detector unless suitable precautions are taken, e.g., provision of a thin first foil to remove light charged particles with energies below ~0.5 MeV.