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CERN Document Server 找到 49 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.53 秒. 
1.
The ATHENA positron accumulator / van der Werf, D P (Swansea U.) ; Jørgensen, L V (Swansea U.) ; Watson, T L (Swansea U.) ; Charlton, M (Swansea U.) ; Collier, M J T (Swansea U.) ; Doser, M (Swansea U.) ; Funakoshi, R (Swansea U.)
A positron accumulator has been constructed for use in the ATHENA anti-hydrogen experiment in CERN. Employing a solid neon moderator plated on to a 50 mCi$^{22}$Na source, a low energy beam of $7 \times 10^6$ positrons/s is guided into a 0.14 T magnetic field where they are trapped and cooled down to room temperature using nitrogen as a buffer gas. [...]
2002 - 5 p. - Published in : Appl. Surf. Sci. 194 (2002) 312-316
In : 9th International Workshop on Slow Positron Beam Techniques for Solids and Surfaces, Dresden, Germany, 16 - 22 Sep 2001, pp.312-316
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2.
Antiproton compression and radial measurements / Alpha Collaboration
Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, achieved by manipulating spatially overlapped electron plasmas. [...]
2008 - 10 p. - Published in : AIP Conf. Proc. 1037 (2008) 96-105
In : Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 20 - 22 Feb 2008, pp.96-105
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3.
First Attempts at Antihydrogen Trapping in ALPHA / Andresen, G B (Aarhus U.) ; Bertsche, W (Swansea U.) ; Bowe, P D (Aarhus U.) ; Bray, C C (UC, Berkeley) ; Butler, E (Swansea U.) ; Cesar, C L (Rio de Janeiro Federal U.) ; Chapman, S (UC, Berkeley) ; Charlton, M (Swansea U.) ; Fajans, J (UC, Berkeley) ; Funakoshi, R (Tokyo U.) et al.
We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. [...]
2008 - 8 p. - Published in : AIP Conf. Proc. 1037 (2008) 241-248
In : Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 20 - 22 Feb 2008, pp.241-248
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4.
Towards trapped antihydrogen / ALPHA Collaboration
Substantial progress has been made in the last few years in the nascent field of antihydrogen physics. The next big step forward is expected to be the trapping of the formed antihydrogen atoms using a magnetic multipole trap. [...]
2008 - Published in : Nucl. Instrum. Methods Phys. Res., B 266 (2008) 357-362
In : 14th International Workshop on Low Energy Positron and Positronium Physics, Reading, England, 1-4 August 2007, pp.357-362
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5.
Antihydrogen Physics at ALPHA/CERN / ALPHA Collaboration
2011 - Published in : Can. J. Phys. 87 (2011) 791-797
In : International Conference on Precision Physics of Simple Atomic Systems, Windsor U., Windsor, Ontario, Canada, 21 – 26 Jul 2008, pp.791-797
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6.
Antimatter Plasmas in a Multipole Trap for Antihydrogen / ALPHA Collaboration
We have demonstrated storage of plasmas of the charged constituents of the antihydrogen atom, antiprotons and positrons, in a Penning trap surrounded by a minimum-B magnetic trap designed for holding neutral antiatoms. The neutral trap comprises a superconducting octupole and two superconducting, solenoidal mirror coils. [...]
2007 - 4 p. - Published in : Phys. Rev. Lett. 98 (2007) 023402
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7.
Positron Plasma Control Techniques Applied to Studies of Cold Antihydrogen / Funakoshi, Ryo
In the year 2002, two experiments at CERN succeeded in producing cold antihydrogen atoms, first ATHENA and subsequently ATRAP [...]
CERN-THESIS-2009-088 - Tokyo : U., 2003. - 96 p.

Fulltext
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8.
Temporally Controlled Modulation of Antihydrogen Production and the Temperature Scaling of Antiproton-Positron Recombination / ATHENA Collaboration
2008 - Published in : Phys. Rev. Lett. 101 (2008) 053401 APS Published version, local copy: PDF;
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9.
Production of antihydrogen at reduced magnetic field for anti-atom trapping / ALPHA Collaboration
We have demonstrated production of antihydrogen in a 1$,$T solenoidal magnetic field. This field strength is significantly smaller than that used in the first generation experiments ATHENA (3$,$T) and ATRAP (5$,$T). [...]
arXiv:0807.0220.- 2008 - 5 p. - Published in : J. Phys. B 41 (2008) 011001 Fulltext: PDF; External link: Preprint
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10.
A novel antiproton radial diagnostic based on octupole induced ballistic loss / ALPHA Collaboration
We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. [...]
arXiv:0807.0074.- 2008 - 8 p. - Published in : Phys. Plasmas 15 (2008) 032107 Fulltext: PDF; External link: Preprint
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