New source of dense, cryogenic positron plasmas -: art. no. 025002

被引：95

作者：

Jorgensen, LV ^{[1
]}

Amoretti, M

Bonomi, G

Bowe, PD

Canali, C

Carraro, C

Cesar, CL

Charlton, M

Doser, M

Fontana, A

Fujiwara, MC

Funakoshi, R

Genova, P

Hangst, JS

Hayano, RS

Kellerbauer, A

Lagomarsino, V

Landua, R

Rizzini, EL

Macrì, M

Madsen, N

Mitchard, D

Montagna, P

Rotondi, A

Testera, G

Variola, A

Venturelli, L

van der Werf, DP

Yamazaki, Y

机构：

[1] Univ Coll Swansea, Dept Phys, Swansea SA2 8PP, W Glam, Wales

[2] INFN, Sez Genova, I-16146 Genoa, Italy

[3] CERN, PH Dept, CH-1211 Geneva, Switzerland

[4] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[5] Univ Brasilia, Inst Fis, BR-21941972 Rio De Janeiro, Brazil

[6] Sez Pavia, Ist Nazl Fis Nucl, I-27100 Pavia, Italy

[7] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy

[8] TRIUMF, Vancouver, BC V6T 2A3, Canada

[9] RIKEN, Atom Phys Lab, Saitama 3510198, Japan

[10] Univ Tokyo, Dept Phys, Tokyo 1538902, Japan

[11] Univ Aarhus, Dept Phys & Astron, DK-8000 Aarhus, Denmark

[12] Univ Brescia, Dipartimento Chim & Fis Ingn Mat, I-25123 Brescia, Italy

[13] INFN Grp Collegato Brescia, I-25123 Brescia, Italy

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.95.025002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 1.2x10(9) positrons, which is a factor 4 higher than previously reported. Using a rotating wall electric field, plasmas containing about 20x10(6) positrons were compressed to a density of 2.6x10(10) cm(-3). This is a factor of 6 improvement over earlier measurements.

引用

页数：5

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