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Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Nuclear Technology
Fusion Science and Technology
Latest News
ARPA-E announces $40 million to develop transmutation technologies for UNF
The Department of Energy’s Advanced Research Projects Agency–Energy (ARPA-E) announced $40 million in funding to develop cutting-edge technologies to enable the transmutation of used nuclear fuel into less-radioactive substances. According to ARPA-E, the new initiative addresses one of the agency’s core goals as outlined by Congress: to provide transformative solutions to improve the management, cleanup, and disposal of radioactive waste and spent nuclear fuel.
Kazunori Takahashi, Daiki Sato
Fusion Science and Technology | Volume 63 | Number 1 | May 2013 | Pages 395-397
doi.org/10.13182/FST13-A16966
Articles are hosted by Taylor and Francis Online.
High density helicon plasma is produced by a 13.56 MHz rf discharge under an IGBT-pulsed expanding and strong magnetic field, where the compact solenoid (inner diameter of 10 cm and 616 turn) is used for the formation of the magnetic field. The solenoid current is pulsed by the IGBT device with a pulse width of 20-40 msec. The solenoid current and the resultant magnetic field strength are proportional to the charging voltage to the capacitor. In the presently used solenoid and circuit, the maximum current and the resultant field strength are about 56 A and 3 kGauss, respectively. For the rf power of about 700 W, the high density plasma of about 4 × 1012 cm-3 is achieved. Above the field strength of about 1.6 kGauss, the source plasma density is constant, while the downstream density increases due to the suppression of the radial loss of the plasma particles.