@techreport{oai:nifs-repository.repo.nii.ac.jp:00010105,
 author = {"Ohyabu,  N. and Sagara,  A. and Ono,  T. and Kawamura,  T. and Motojima,  O."},
 month = {Jul},
 note = {"A new hydrogen pumping scheme has been proposed which controls recycling of the particles for significant improvement of the energy confinement in toroidal magnetic fusion devices. In this scheme, a part of the vacuum vessel surface near the divertor is covered with carbon sheets of a large surface area. Before discharge initiation, the sheets are baked up to 700 ~ 1000 C degree to remove the previously trapped hydrogen atoms. After being cooled down to below - 200 C degree, the unsaturated carbon sheets trap high energy charge exchange hydrogen atoms effectively during a discharge and overall pumping efficiency can be as high as ~ 50 %."},
 title = {Carbon Sheet Pumping},
 year = {1993}
}