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28 March 2024
 
  » pubmed » pmid16090691

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New source of dense, cryogenic positron plasmas
L V Jørgensen ; M Amoretti ; G Bonomi ; P D Bowe ; C Canali ; C Carraro ; C L Cesar ; M Charlton ; M Doser ; A Fontana ; M C Fujiwara ; R Funakoshi ; P Genova ; J S Hangst ; R S Hayano ; A Kellerbauer ; V Lagomarsino ; R Landua ; E Lodi Rizzini ; M Macrì ; N Madsen ; D Mitchard ; P Montagna ; A Rotondi ; G Testera ; A Variola ; L Venturelli ; D P van der Werf ; Y Yamazaki ; ;
Date 8 Jul 2005
Journal Phys Rev Lett, 95 (2), 025002
AbstractWe 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.
Source PubMed, pmid16090691
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