skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A THEORETICAL SURVEY OF FORMATION OF ANTIHYDROGEN ATOMS IN A PENNING TRAP

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1337078
Report Number(s):
LA-UR-07-3084
Journal ID: ISSN 0094-243X
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Journal Volume: 926; Conference: 15TH INTERNATIONAL CONFERENCE ON ATOMIC PROCESSES IN PLASMAS ; 200703 ; GAITHERSBURG
Country of Publication:
United States
Language:
English

Citation Formats

VRINCEANU, DANIEL. A THEORETICAL SURVEY OF FORMATION OF ANTIHYDROGEN ATOMS IN A PENNING TRAP. United States: N. p., 2007. Web. doi:10.1063/1.2768837.
VRINCEANU, DANIEL. A THEORETICAL SURVEY OF FORMATION OF ANTIHYDROGEN ATOMS IN A PENNING TRAP. United States. doi:10.1063/1.2768837.
VRINCEANU, DANIEL. Mon . "A THEORETICAL SURVEY OF FORMATION OF ANTIHYDROGEN ATOMS IN A PENNING TRAP". United States. doi:10.1063/1.2768837. https://www.osti.gov/servlets/purl/1337078.
@article{osti_1337078,
title = {A THEORETICAL SURVEY OF FORMATION OF ANTIHYDROGEN ATOMS IN A PENNING TRAP},
author = {VRINCEANU, DANIEL},
abstractNote = {},
doi = {10.1063/1.2768837},
journal = {},
number = ,
volume = 926,
place = {United States},
year = {Mon May 07 00:00:00 EDT 2007},
month = {Mon May 07 00:00:00 EDT 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Numerous antihydrogen atoms are created at CERN, by ATRAP and ATHENA experiments, by bringing together positrons and antiprotons in a magnetic Penning trap. Most of these atoms are created in exotic, highly excited states, such that the magnetic forces on positrons are greater than the Coulomb attraction of antiprotons. This paper presents an overview of the recent progress made toward theoretical understanding of the complicated dynamics which leads to the formation and detection of antihydrogen atoms. There is no formal difference between the plasmas described here and normal, electron-proton, matter plasmas, except the reversed sign of electrical charges. The nextmore » generation of experiments need to bring the antihydrogen atoms to the ground state and to cool them to sub-milliKelvin temperature. Only then, high resolution spectroscopy can expose differences between matter and antimatter due to CPT violations. Suggestions are made for possible pathways toward this goal.« less
  • Antiprotons (p) remain confined in a Penning trap, in sufficient numbers to form antihydrogen (H) atoms via charge exchange, when the radial field of a quadrupole Ioffe trap is added. This first demonstration with p suggests that quadrupole Ioffe traps can be superimposed upon p and e{sup +} traps to attempt the capture of H atoms as they form, contrary to conclusions of previous analyses.
  • There exists an international quest to trap neutral antimatter in the form of antihydrogen for scientific study. One method that is being developed for trapping antihydrogen employs a nested Penning trap. Such a trap serves to mix positrons and antiprotons so as to produce low energy antihydrogen atoms. Mixing is achieved when the confinement volumes of the two species overlap one another. In the work presented here, a theoretical understanding of the mixing process is developed by analyzing a mixing scheme that was recently reported [G. Gabrielse et al., Phys. Rev. Lett. 100, 113001 (2008)]. The results indicate that positronmore » space charge or collisions among antiprotons may substantially reduce the fraction of antiprotons that have an energy suitable for antihydrogen trapping.« less
  • Slow antihydrogen (H) is produced within a Penning trap that is located within a quadrupole Ioffe trap, the latter intended to ultimately confine extremely cold, ground-state H atoms. Observed H atoms in this configuration resolve a debate about whether positrons and antiprotons can be brought together to form atoms within the divergent magnetic fields of a quadrupole Ioffe trap. The number of detected H atoms actually increases when a 400 mK Ioffe trap is turned on.
  • In many antihydrogen trapping schemes, antiprotons held in a short-well Penning-Malmberg trap are released into a longer well. This process necessarily causes the bounce-averaged rotation frequency {omega}{sub r} of the antiprotons around the trap axis to pass through zero. In the presence of a transverse magnetic multipole, experiments and simulations show that many antiprotons (over 30% in some cases) can be lost to a hitherto unidentified bounce-resonant process when {omega}{sub r} is close to zero.