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  • 1
    Electronic Resource
    Electronic Resource
    Antihydrogen production using trapped plasmas
    Amsterdam : Elsevier
    Physics Letters A 129 (1988), S. 38-42 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(88)90470-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Open-endcap Penning traps for high precision experiments
    Amsterdam : Elsevier
    International Journal of Mass Spectrometry and Ion Processes 88 (1989), S. 319-332 
    Details
    ISSN: 0168-1176
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-1176(89)85027-X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trapped positrons for antihydrogen (1994)
    Springer
    Hyperfine interactions 89 (1994), S. 371-380 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positrons from a 12 mCi22Na source are slowed by a W(110) reflection moderator and then captured in a Penning trap, by damping their motion with a tuned circuit. Because of the stability of the Penning trap and the cryogenic ultra-high vacuum environment, we anticipate that positrons can be accumulated and stored indefinitely. A continuous loading rate of 0.14 e+/s is observed for 32 h in this initial demonstration. More than 1.6×104 positrons have thus been trapped and stored at 4 K, with improvements expected. The extremely high vacuum is required for compatibility with an existing antiproton trap, which has already held more than 105 antiprotons at 4 K, for producing antihydrogen at low temperatures. The extremely cold positrons in high vacuum may also prove to be useful for cooling highly stripped ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064520
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A single trapped antiproton and antiprotons for antihydrogen production (1993)
    Springer
    Hyperfine interactions 81 (1993), S. 5-14 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract During the last several years, our TRAP collaboration has pioneered techniques for slowing, trapping, cooling and indefinitely storing antiprotons to energies more than 1010 times lower than previously possible. The radio signal from a single trapped antiproton is now being used for precision measurements. Many cold antiprotons are “stacked” as another important step toward the eventual production of antihydrogen, and positrons have been trapped in vacuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567246
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Possible antihydrogen production using trapped plasmas (1989)
    Springer
    Hyperfine interactions 44 (1989), S. 287-293 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Since antiprotons have been captured in an ion trap, we consider the possibility of producing antihydrogen by merging cold trapped plasmas of antiprotons and positrons. The calculated, instantaneous rate for antihydrogen production by the 3-body recombination $$p^ - + e^ + + e^ + \to \bar H + e^ + $$ is much higher than for other proposed techniques, opening up intriguing experimental possibilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398677
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Extremely cold positrons for antihydrogen production (1993)
    Springer
    Hyperfine interactions 76 (1993), S. 143-150 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The storage of extremely cold (4 K) antiprotons in a Penning trap is an important step toward the creation and study of cold antihydrogen. The other required ingredient, the largest possible number of comparably cold positrons, is still lacking. These would be recombined in a high vacuum with the trapped antiprotons, already stored at a pressure below 5×10−17 Torr, thereby avoiding annihilation of the antihydrogen atoms before they can be used in high accuracy measurements or in controlled collision experiments. In an exploratory experiment, positrons from a 18 mCi22Na source follow fringing field lines of a 6 T superconducting solenoid through tiny apertures in the electrodes of a Penning trap to strike a tungsten (reflection) moderator. The positron beam is chopped mechanically and a lock-in directly detects a positron current of 2.5×106e+/s on the moderator. The use of a moderator, unlike an earlier experiment in which 〈 100 positrons were confined in vacuum, should greatly increase the number of positrons trapped in high vacuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316713
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  • 7
    Electronic Resource
    Electronic Resource
    Extremely cold antiprotons for antihydrogen production (1993)
    Springer
    Hyperfine interactions 76 (1993), S. 81-93 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibility to produce, trap and study antihydrogen atoms rests upon the recent availability of extremely cold antiprotons in a Penning trap. Over the last five years, our TRAP Collaboration has slowed, cooled and stored antiprotons at energies 1010 lower than was previously possible. The storage time exceeds 3.4 months despite the extremely low energy, which corresponds to 4.2 K in temperature units. The first example of measurements which become possible with extremely cold antiprotons is a comparison of the antiproton inertial masses which shows they are the same to a fractional accuracy of 4×10−8. (This is 1000 times more accurate than previous comparisons and large additional increases in accuracy are anticipated.) To increase the number of trapped antiprotons available for antihydrogen production, we have demonstrated that we can accumulate or “stack” antiprotons cooled from successive pulsed injections into our trap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316708
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    Paper (German National Licenses)
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