CERN Accelerating science

CERN Document Server 21 ჩანაწერია ნაპოვნი  1 - 10შემდეგიდასასრული  ჩანაწერთან გადასვლა: ძიებას დასჭირდა 0.64 წამი. 
1.
Two-Symmetry Penning-Ioffe Trap for Antihydrogen Cooling and Spectroscopy / Tardiff, E. (Northwestern U. (main)) ; Fan, X. (Northwestern U. (main) ; Harvard U., Phys. Dept.) ; Gabrielse, G. (Northwestern U. (main)) ; Grzonka, D. (Julich, Forschungszentrum) ; Hamley, C. (Harvard U., Phys. Dept.) ; Hessels, E.A. (York U., Canada) ; Jones, N. (Harvard U., Phys. Dept.) ; Khatri, G. (CERN) ; Kolthammer, W.S. (Imperial Coll., London) ; Martinez Zambrano, D. (Northwestern U.) et al.
High-accuracy spectroscopic comparisons of trapped antihydrogen atoms ($\overline{\text{H}}$) and hydrogen atoms ($\text{H}$) promise to stringently test the fundamental CPT symmetry invariance of the standard model of particle physics. ATRAP's nested Penning-Ioffe trap was developed for such studies. [...]
arXiv:2003.05032.- 2020-10-11 - 20 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 977 (2020) 164279 Fulltext: PDF; Fulltext from the publisher: PDF;
2.
Electron-cooled accumulation of $4 × 10^9$ positrons for production and storage of antihydrogen atoms / Fitzakerley, DW (York U., Canada) ; George, M C (York U., Canada) ; Hessels, E A (York U., Canada) ; Skinner, T D G (York U., Canada) ; Storry, C H (York U., Canada) ; Weel, M (York U., Canada) ; Gabrielse, G (Harvard U., Phys. Dept.) ; Hamley, C D (Harvard U., Phys. Dept.) ; Jones, N (Harvard U., Phys. Dept.) ; Marable, K (Harvard U., Phys. Dept.) et al. /ATRAP
Four billion positrons (e+) are accumulated in a Penning–Ioffe trap apparatus at 1.2 K and <6 × 10−17 Torr. This is the largest number of positrons ever held in a Penning trap. [...]
2016 - 6 p. - Published in : J. Phys. B 49 (2016) 064001
3.
One-Particle Measurement of the Antiproton Magnetic Moment / ATRAP Collaboration
The antiproton $(\bar{p})$ magnetic moment $\mu \bar{p} = \mu_{\bar{p}} S/(\bar{h}/2)$ is proportional to its spin $S$. A single trapped $\bar{p}$ is used for the first time to measure the $\bar{p}$ magnetic moment in nuclear magnetons, giving $\mu_\bar{p}/\mu N = -2.792 845 \pm 0.000 012$. [...]
arXiv:1301.6310.- 2013-03-25 - 5 p. - Published in : Phys. Rev. Lett. 110 (2013) 130801 Fulltext: 1301.6310 - PDF; arXiv:1301.6310 - PDF; External links: Physics World article; Interactions.org article
4.
Pumped helium system for cooling positron and electron traps to 1.2 K / ATRAP Collaboration
Extremely precise tests of fundamental particle symmetries should be possible via laser spectroscopy of trapped antihydrogen ((H) over bar) atoms. (H) over bar atoms that can be trapped must have an energy in temperature units that is below 0.5 K-the energy depth of the deepest magnetic traps that can currently be constructed with high currents and superconducting technology. [...]
2011 - Published in : Nucl. Instrum. Methods Phys. Res., A 640 (2011) 232-240
5.
A semiconductor laser system for the production of antihydrogen / ATRAP Collaboration
Laser-controlled charge exchange is a promising method for producing cold antihydrogen. Caesium atoms in Rydberg states collide with positrons and create positronium. [...]
2012 - Published in : New J. Phys. 14 (2012) 055009
6.
Efficient transfer of positrons from a buffer-gas-cooled accumulator into an orthogonally oriented superconducting solenoid for antihydrogen studies / ATRAP Collaboration
Positrons accumulated in a room-temperature buffer-gas-cooled positron accumulator are efficiently transferred into a superconducting solenoid which houses the ATRAP cryogenic Penning trap used in antihydrogen research. The positrons are guided along a 9 m long magnetic guide that connects the central field lines of the 0.15 T field in the positron accumulator to the central magnetic field lines of the superconducting solenoid. [...]
2012 - Published in : New J. Phys. 14 (2012) 045006
7.
Adiabatic Cooling of Antiprotons / ATRAP Collaboration
Adiabatic cooling is shown to be a simple and effective method to cool many charged particles in a trap to very low temperatures. Up to 3 x 10(6) (p) over bar are cooled to 3.5 K-10(3) times more cold (p) over bar and a 3 times lower (p) over bar temperature than previously reported. [...]
2011 - Published in : Phys. Rev. Lett. 106 (2011) 073002
8.
Centrifugal Separation of Antiprotons and Electrons / ATRAP Collaboration
Centrifugal separation of antiprotons and electrons is observed, the first such demonstration with particles that cannot be laser cooled or optically imaged. The spatial separation takes place during the electron cooling of trapped antiprotons, the only method available to produce cryogenic antiprotons for precision tests of fundamental symmetries and for cold antihydrogen studies. [...]
2010 - Published in : Phys. Rev. Lett. 105 (2010) 213002
9.
Trapped Antihydrogen in Its Ground State / ATRAP Collaboration
Antihydrogen atoms ( H ) are confined in an Ioffe trap for 15–1000 s—long enough to ensure that they reach their ground state. Though reproducibility challenges remain in making large numbers of cold antiprotons ( p ) and positrons ( e þ ) interact, 5 1 simultaneously confined ground-state atoms are produced and observed on average, substantially more than previously reported. [...]
arXiv:1201.2717.- 2012-03-16 - 4 p. - Published in : Phys. Rev. Lett. 108 (2012) 113002 Fulltext: 1201.2717 - PDF; arXiv:1201.2717 - PDF; External link: Preprint
10.
Density and geometry of single component plasmas / ATRAP Collaboration
The density and geometry of p¯ and e+ plasmas in realistic trapping potentials are required to understand and optimize antihydrogen (H¯) formation. An aperture method and a quadrupole oscillation frequency method for characterizing such plasmas are compared for the first time, using electrons in a cylindrical Penning trap. [...]
2007 - Published in : Phys. Lett. B 650 (2007) 119-123 Fulltext: PDF;

CERN Document Server : 21 ჩანაწერია ნაპოვნი   1 - 10შემდეგიდასასრული  ჩანაწერთან გადასვლა:
ასევე იხილეთ: მსგავსი ავტორის სახელები
2 Hessels, E
3 Hessels, E.A.
1 Hessels, EA
3 Hessels, Eric
1 Hessels, Eric A
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