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Nuclear Nonproliferation Policy
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Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
K. Ida, M. Yoshinuma, C. Suzuki, T. Kobuchi, K. Y. Watanabe, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 383-393
Chapter 8. Diagnostics | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10824
Articles are hosted by Taylor and Francis Online.
Radial profiles of the rotational transform are measured with the motional Stark effect spectroscopy in the Large Helical Device. They are derived from the radial profiles of the polarization angle of the and components in the H line emitted from high-energy hydrogen atoms of beams with four sets of linear polarizers, spectrometers, and charge-coupled device detectors. Changes in the rotational transform due to the neutral beam current drive (NBCD) and the electron cyclotron current drive are measured. When NBCD is in the direction counter to the equivalent plasma current, the central rotational transform increases because of the inductive current while the edge rotational transform decreases, as is expected. Therefore, the magnetic shear becomes weak with NBCD in the counterdirection, whereas it becomes strong with NBCD in the codirection. NBCD that drives toroidal current, typically <10% of the equivalent toroidal current determined by the external current in the helical coils, can change the rotational transform and magnetic shear significantly enough to change magnetohydrodynamic stability.
