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New source of dense, cryogenic positron plasmas.
MedLine Citation:
PMID:  16090691     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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.
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;
Publication Detail:
Type:  Journal Article     Date:  2005-07-07
Journal Detail:
Title:  Physical review letters     Volume:  95     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-08-10     Completed Date:  2005-09-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  025002     Citation Subset:  -    
Department of Physics, University of Wales Swansea, Swansea SA2 8PP, United Kingdom.
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