Simulations of plasma confinement in an antihydrogen trap

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The three-dimensional particle-in-cell (3-D PIC) simulation code WARP is used to study positron confinement in antihydrogen traps. The magnetic geometry is close to that of a UC Berkeley experiment conducted, with electrons, as part of the ALPHA collaboration (W. Bertsche et al., AIP Conf. Proc. 796, 301 (2005)). In order to trap antihydrogen atoms, multipole magnetic fields are added to a conventional Malmberg-Penning trap. These multipole fields must be strong enough to confine the antihydrogen, leading to multipole field strengths at the trap wall comparable to those of the axial magnetic field. Numerical simulations reported here confirm recent experimental measurements ... continued below

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Gomberoff, K.; Fajans, J.; Friedman, A.; Grote, D.; Vay, J.-L. & Wurtele, J.S. October 15, 2007.

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The three-dimensional particle-in-cell (3-D PIC) simulation code WARP is used to study positron confinement in antihydrogen traps. The magnetic geometry is close to that of a UC Berkeley experiment conducted, with electrons, as part of the ALPHA collaboration (W. Bertsche et al., AIP Conf. Proc. 796, 301 (2005)). In order to trap antihydrogen atoms, multipole magnetic fields are added to a conventional Malmberg-Penning trap. These multipole fields must be strong enough to confine the antihydrogen, leading to multipole field strengths at the trap wall comparable to those of the axial magnetic field. Numerical simulations reported here confirm recent experimental measurements of reduced particle confinement when a quadrupole field is added to a Malmberg-Penning trap. It is shown that, for parameters relevant to various antihydrogen experiments, the use of an octupole field significantly reducesthe positron losses seen with a quadrupole field. A unique method for obtaining a 3-D equilibrium of the positrons in the trap with a collisionless PIC code was developed especially for the study of the antihydrogen trap; however, it is of practical use for other traps as well.

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  • Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 10; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL-1196E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 942137
  • Archival Resource Key: ark:/67531/metadc893414

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  • October 15, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 11:50 a.m.

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Gomberoff, K.; Fajans, J.; Friedman, A.; Grote, D.; Vay, J.-L. & Wurtele, J.S. Simulations of plasma confinement in an antihydrogen trap, article, October 15, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc893414/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.