Plasma manipulation techniques for positron storage in a multicell trap

Danielson, J. R.; Weber, T. R.; Surko, C. M.

doi:10.1063/1.2390690

Cited by 52 publications

(86 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus confinement of large particle numbers requires large confinement potentials, and this can lead to plasma heating and/or electrical breakdown. Methods are under development to arrange multiple PM traps in parallel in the same vacuum chamber and magnetic field to overcome this limitation (Danielson et al, 2006;Surko and Greaves, 2003). Given acceptable positron sources, accumulation and confinement techniques, and methods to cool and compress the resulting collections of antimatter, it remains a major challenge to tailor the delivery of the antiparticles for specific end uses.…”

Section: Introduction and Overviewmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

234

222

View full text Add to dashboard Cite

In recent years, there has been a wealth of new science involving low-energy antimatter (i.e., positrons and antiprotons) at energies ranging from 10 2 to less than 10 −3 eV. Much of this progress has been driven by the development of new plasma-based techniques to accumulate, manipulate and deliver antiparticles for specific applications. This article focuses on the advances made in this area using positrons. However many of the resulting techniques are relevant to antiprotons as well. An overview is presented of relevant theory of single-component plasmas in electromagnetic traps. Methods are described to produce intense sources of positrons and to efficiently slow the typically energetic particles thus produced. Techniques are described to trap positrons efficiently and to cool and compress the resulting positron gases and plasmas. Finally, the procedures developed to deliver tailored pulses and beams (e.g., in intense, short bursts, or as quasi-monoenergetic continuous beams) for specific applications are reviewed. The status of development in specific application areas is also reviewed. One example is the formation of antihydrogen atoms for fundamental physics [e.g., tests of invariance under charge conjugation, parity inversion and time reversal (the CPT theorem), and studies of the interaction of gravity with antimatter]. Other applications discussed include atomic and materials physics studies and study of the electron-positron many-body system, including both classical electron-positron plasmas and the complementary quantum system in the form of Bose-condensed gases of positronium atoms. Areas of future promise are also discussed. The review concludes with a brief summary and a list of outstanding challenges.

show abstract

Section: Introduction and Overviewmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

234

222

View full text Add to dashboard Cite

show abstract

“…A related, but different control method is the direct autoresonance (AR), where instead of parametric modulations, a chirped external driving force is applied. The direct AR was extensively studied and implemented in various classical and quantum physical systems [10][11][12][13][14][15].When studying the classical to quantum transitions in the direct chirped-driven oscillator, one identifies two limits, where quantum dynamical effects are significant. The first is the saturation of temperature-dependent classical observables at small temperatures due to the zero point quantum fluctuations [16,17].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Quantum Phenomena in a Chirped Parametric Anharmonic Oscillator

Barth

Frièdland

2014

Phys. Rev. Lett.

View full text Add to dashboard Cite

The parametric ladder climbing (successive Landau-Zener-type transitions) and the quantum saturation of the threshold for the classical parametric autoresonance due to the zero point fluctuations at low temperatures are discussed. The probability for capture into the chirped parametric resonance is found by solving the Schrodinger equation in the energy basis and the associated resonant phase space dynamics is illustrated via the Wigner distribution. The numerical threshold for the efficient capture into the resonance is compared with the classical and quantum theories in different parameter regimes.PACS numbers: 42.50.Lc, 05.45.Xt, 85.25.Cp Introduction.-The parametric resonance is one of the most interesting and frequently used phenomena in classical and quantum dynamics. It occurs when the natural frequency of a system depends on a parameter oscillating (modulated) at twice the natural system's frequency [1][2][3][4][5]. In the well studied stationary case, the modulation frequency is constant. However, in nonlinear systems the stationary parametric amplification is restricted to small amplitudes, since at larger amplitudes the resonance (phase-locking) is destroyed due to the nonlinear frequency shift [1]. A robust method to overcome this limitation is to slowly vary the modulation frequency so that the resonance condition is preserved despite the increase of the amplitude of oscillations. This nonstationary phenomenon is called parametric autoresonance (PAR). The PAR was studied in such classical oscillatory systems as the anharmonic oscillator [6,7], Faraday waves [8,9], and plasmas [10]. A related, but different control method is the direct autoresonance (AR), where instead of parametric modulations, a chirped external driving force is applied. The direct AR was extensively studied and implemented in various classical and quantum physical systems [10][11][12][13][14][15].When studying the classical to quantum transitions in the direct chirped-driven oscillator, one identifies two limits, where quantum dynamical effects are significant. The first is the saturation of temperature-dependent classical observables at small temperatures due to the zero point quantum fluctuations [16,17]. In the second limit, at sufficiently large anharmonicity, the smooth classical AR dynamics of many simultaneously coupled energy levels transforms into a quantum ladder climbing involving successive two-level Landau-Zener (LZ) transitions [17][18][19][20]. These two quantum limits were also studied recently in the case of the direct chirped subharmonic (twophoton) resonance [21]. This letter, for the first time, discusses the analogous quantum phenomena in application to the PAR.The model.-The simplest system exhibiting nonlinear parametric resonance is the anharmonic oscillator governed by Hamiltonian

show abstract

“…A bright source of moderated positrons is already available [25] , and a promising positron accumulation trap concept, capable of holding more than 10 11 positrons, has been developed [26].…”

Section: Discussionmentioning

confidence: 99%

Pure electron plasmas confined for 90 ms in a stellarator without electron sources or internal objects

Brenner

Pedersen

2012

Physics of Plasmas

View full text Add to dashboard Cite

We report on the creation and up to 90 millisecond sustainment of pure electron plasmas confined in a stellarator without internal objects. Injection of positrons into such plasmas are expected to lead to the creation of the first electron-positron plasma experiments. These newly created plasmas will also allow a study of pure electron plasmas without the perturbing presence of internal objects.The plasmas were created by thermionic emission of electrons from a heated, biased filament that was retracted in 20 milliseconds. The confinement of these transient plasmas is different from that of steady state plasmas with internal objects and emissive filaments, and is generally shorter, limited by ion buildup. The decay time is increased by lowering the neutral pressure, lowering the electron plasma temperature, or operating with neutrals with high ionization energies (helium). These findings are all consistent with ion accumulation being the cause for the shorter than expected confinement times. The magnetic field strength also moderately increases the decay times. The deleterious effect of ions is not expected to imply a similar deleterious effect when introducing positrons, but it implies that ion accumulation must be avoided also in an electronpositron experiment.

show abstract

Plasma manipulation techniques for positron storage in a multicell trap

Cited by 52 publications

References 40 publications

Plasma and trap-based techniques for science with positrons

Plasma and trap-based techniques for science with positrons

Quantum Phenomena in a Chirped Parametric Anharmonic Oscillator

Pure electron plasmas confined for 90 ms in a stellarator without electron sources or internal objects

Contact Info

Product

Resources

About