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Fusion Science and Technology
Latest News
DNFSB’s Summers ends board tenure, extending agency’s loss of quorum
Lee
Summers
The Defense Nuclear Facilities Safety Board, the independent agency responsible for ensuring that Department of Energy facilities are protective of public health and safety, announced that the board’s acting chairman, Thomas Summers, has concluded his service with the agency, having completed his second term as a board member on October 18.
Summers’ departure leaves Patricia Lee, who joined the DNFSB after being confirmed by the Senate in July 2024, as the board’s only remaining member and acting chair. Lee’s DNFSB board term ends in October 2027.
Jong-Ha Lee, Won-Ha Ko, Dong-Cheol Seo, Young-Woo Kim, Jung-Sik Yoon
Fusion Science and Technology | Volume 55 | Number 2 | February 2009 | Pages 100-105
Technical Paper | Seventh International Conference on Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST09-A6991
Articles are hosted by Taylor and Francis Online.
The Hanbit mirror device has been renovated as Multi-Purpose Plasma (MP2) facility for the divertor plasma simulation, space propulsion, and astrophysical researches. The intensity ratios of He I emission lines are used to determine electron density and temperature in MP2. The He I line ratios are measured by optical emission spectroscopy and are calculated using the collisional-radiative equilibrium model. The measured He I line ratios are 706.52 nm / 728.13 nm for electron temperature and 728.13 nm / 667.82 nm for electron density determination, respectively. The results obtained from the collisional-radiative equilibrium model are crosschecked with those of electrical probe measurement.
