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Fusion Energy Week begins today
Fusion is riding a surge of attention that began in December 2022 when researchers at Lawrence Livermore National Laboratory’s National Ignition Facility achieved fusion ignition. The organizers of Fusion Energy Week—a group called the U.S. Fusion Outreach Team—on the other hand, trace fusion development back 100 years to the doctoral research of Cecilia Payne-Gaposchkin, who discovered that stars, including our Sun, are mostly made of hydrogen and helium, which in turn led to the understanding that those elements are the “fuel” of potential fusion energy systems on Earth. In recognition of Payne-Gaposchkin’s birthday—May 10—the U.S. Fusion Outreach Team plans to hold a “grassroots celebration of fusion energy” May 6–10, 2024, and annually during the second week of May.
Ikuji Takagi, Kouta Kodama,* Kazuo Shin, Kunio Higashi, Hideki Zushi, Tohru Mizuuchi, Tohru Senjyu, Masahiro Wakatani, Tokuhiro Obiki
Fusion Science and Technology | Volume 25 | Number 2 | March 1994 | Pages 137-146
Technical Paper | First-Wall Technology | doi.org/10.13182/FST94-A30263
Articles are hosted by Taylor and Francis Online.
Two experiments on the plasma-driven permeation (PDP) of deuterium through nickel membranes were conducted. One was an observation of the permeation during the discharge cleaning of Heliotron E, one of the largest helical systems. Significant amounts of deuterium permeated. The deuterium permeation was also observed during a helium discharge, where deuterium recycled between the plasma and chamber walls. Because the permeation was strongly influenced by impurities such as oxygen on the plasma-facing surface of the membrane, the PDP would be useful for a diagnosis of the discharge cleaning. The second experiment was a study on transient behaviors of the permeation when nickel membranes were exposed to a deuterium plasma for short times. The small device with a radio-frequency plasma was used to simulate pulse operations of large plasma devices. The maximum permeation flux at the nonsteady state was found to be nearly proportional to the exposure time of the plasma. Numerical calculations reproduced very well the transient behaviors of the deuterium permeation in the pulse-exposure experiments. Based on the results of the two experiments, it is expected that the deuterium PDP from neutral beam injection-heated plasmas in Heliotron E will be observed.