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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

New source of dense, cryogenic positron plasmas.

We have developed a new method, based on the ballistic transfer of preaccumulated plasmas, to obtain large and dense positron plasmas in a cryogenic environment. The method involves transferring plasmas emanating from a region with a low magnetic field (0.14 T) and relatively high pressure (10(-9) mbar) into a 15 K Penning-Malmberg trap immersed in a 3 T magnetic field with a base pressure better than 10(-13) mbar. The achieved positron accumulation rate in the high field cryogenic trap is more than one and a half orders of magnitude higher than the previous most efficient UHV compatible scheme. Subsequent stacking resulted in a plasma containing more than 1.2 x 10(9) positrons, which is a factor 4 higher than previously reported. Using a rotating wall electric field, plasmas containing about 20 x 10(6) positrons were compressed to a density of 2.6 x 10(10) cm(-3). This is a factor of 6 improvement over earlier measurements.[1]

References

  1. New source of dense, cryogenic positron plasmas. Jørgensen, L.V., Amoretti, M., Bonomi, G., Bowe, P.D., Canali, C., Carraro, C., Cesar, C.L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M.C., Funakoshi, R., Genova, P., Hangst, J.S., Hayano, R.S., Kellerbauer, A., Lagomarsino, V., Landua, R., Lodi Rizzini, E., Macrì, M., Madsen, N., Mitchard, D., Montagna, P., Rotondi, A., Testera, G., Variola, A., Venturelli, L., van der Werf, D.P., Yamazaki, Y. Phys. Rev. Lett. (2005) [Pubmed]
 
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