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Communications in Theoretical Physics

Combined Trap and Related Experiments

Guozhong Li

Published Dec 1, 1989• 14 citations
Publisher

Abstract

The regions of stability for simultaneous storage of positive and negative ions in the Combined trap are studied. It is shown that the regions of stability for the Combined trap are significantly larger than that for the Paul trap. The possibilities of making antihydrogen by simultaneous storage of antiprotons and positron clouds in this trap are also discussed.

DOI
10.1088/0253-6102/12/4/355

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AIP conference proceedings•Jan 1, 2012•0 citations
The regions of stability for simultaneous storage of positive and negative ions in the Combined trap are studied. It is shown that the regions of stability for the Combined trap are significantly larger than that for the Paul trap. The possibilities of making antihydrogen by simultaneous storage of antiprotons and positron clouds in this trap are also discussed.
We investigate the properties of a radiofrequency (Paul)-trap with a super-imposed magnetic field (combined trap). The regions of stability are significantly larger than those for a Paul-trap for both positive and negative charged ions. As a result ions of different charge sign and large mass difference can be confined simultaneously. This may have some advantages for electron cooling of highly charged ions or for the formation of anti-hydrogen from simultaneously stored positrons and antiprotons.
Radio-frequency (rf) Paul traps operated with multifrequency rf trapping potentials provide the ability to independently confine charged particle species with widely different charge-to-mass ratios. In particular, these traps may find use in the field of antihydrogen recombination, allowing antiproton and positron clouds to be trapped and confined in the same volume without the use of large superconducting magnets. We explore the stability regions of two-frequency Paul traps and perform numerical simulations of small samples of multispecies charged-particle mixtures of up to twelve particles that indicate the promise of these traps for antihydrogen recombination.
Radio-frequency (rf) Paul traps operated with multifrequency rf trapping potentials provide the ability to independently confine charged particle species with widely different charge-to-mass ratios. In particular, these traps may find use in the field of antihydrogen recombination, allowing antiproton and positron clouds to be trapped and confined in the same volume without the use of large superconducting magnets. We explore the stability regions of two-frequency Paul traps and perform numerical simulations of small samples of multispecies charged-particle mixtures of up to twelve particles that indicate the promise of these traps for antihydrogen recombination.
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. We have measured the storage lifetimes of antiproton and positron plasmas in the combined Penning-neutral trap, and compared these to lifetimes without the neutral trap fields. The magnetic well depth was 0.6 T, deep enough to trap ground state antihydrogen atoms of up to about 0.4 K in temperature. We have demonstrated that both particle species can be stored for times long enough to permit antihydrogen production and trapping studies.
Over the last decades it has become routine to form beams of positrons and antiprotons and to use them to produce trapped samples of both species for a variety of purposes. Positrons can be captured efficiently, for instance using a buffer-gas system, and in such quantities to form dense, single component plasmas useful for antihydrogen formation. The latter is possible using developments of techniques for dynamically capturing and then cooling antiprotons ejected from the Antiproton Decelerator at CERN. The antiprotons can then be manipulated by cloud compression and evaporative cooling to form tailored plasmas. We will review recent advances that have allowed antihydrogen atoms to be confined for the first time in a shallow magnetic minimum neutral atom trap superimposed upon the region in which the antiparticles are held and mixed. A new mixing technique has been developed to help achieve this using autoresonant excitation of the centreofmass longitudinal motion of an antiproton cloud. This allows efficient antihydrogen formation without imparting excess energy to the antiprotons and helps enhance the probability of trapping the anti-atom. © 2012 American Institute of Physics.