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Fusion Science and Technology
Latest News
College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
U. Stroth, J. Baldzuhn, B. Brañas, V. Erckmann, T. Estrada, L. Giannone, M. Hirsch, H.-J. Hartfuß, M. Kick, G. Kühner, H. Ringler, F. Wagner
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 169-177
Helical Systems | doi.org/10.13182/FST95-A11947062
Articles are hosted by Taylor and Francis Online.
Parameter scans in density, heating power and isotope mass have been carried out in W7-AS. ECRH at a frequency of 140 GHz has allowed to study the density scaling of the energy confinement time of ECRH plasmas up to densities of 1020 m-3. In power scans it has been tried to relate the power degradation of the energy confinement to a local plasma parameter. Transport analyses using power balance an heat wave techniques indicate that the transport coefficient does not depend on the electron temperature or related parameters. This observation can be reconciled with power degradation if the transport coefficient is formally allowed to vary with changes in the heating power on a faster than the diffusive time scale. Such a transport process describes also the observations inthe dynamic phases following large changes in the heating power.