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Author: Erik Peter Gilson
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Book Description
We performed experiments that explore the effects of a quadrupole magnetic field on a pure electron plasma confined in a Malmberg-Penning trap. This work is important both as an example of resonant particle transport and for antihydrogen (H-bar)). The H-bar experiments plan to use magnetic quadrupole neutral atom traps to confine H-bar atoms created in double-well positron/antiproton Malmberg-Penning traps. Our results show that a quadrupole field of only 0.020 G/cm can cause significant transport when applied to a 1 cm radius plasma confined by an axial field of 100 G. Our model describes the shape of the plasma and shows that resonant electrons follow trajectories that take them on large radial excursions, leading to enhanced transport. If the electrons are off resonance, then diffusion will not be greatly enhanced. The measured diffusion scales like the square of the quadrupole field strength, inversely like the square of the axial magnetic field and. below resonance, like the square of the E x B rotation frequency. The location of the resonance in parameter space scales accordingly as we vary the length and temperature of the plasma. However, the temperature used in fitting the data differs from the independently measured temperature by a factor of four, suggesting that our description of the effect as purely diffusive is not correct.
Author: Erik Peter Gilson
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Book Description
We performed experiments that explore the effects of a quadrupole magnetic field on a pure electron plasma confined in a Malmberg-Penning trap. This work is important both as an example of resonant particle transport and for antihydrogen (H-bar)). The H-bar experiments plan to use magnetic quadrupole neutral atom traps to confine H-bar atoms created in double-well positron/antiproton Malmberg-Penning traps. Our results show that a quadrupole field of only 0.020 G/cm can cause significant transport when applied to a 1 cm radius plasma confined by an axial field of 100 G. Our model describes the shape of the plasma and shows that resonant electrons follow trajectories that take them on large radial excursions, leading to enhanced transport. If the electrons are off resonance, then diffusion will not be greatly enhanced. The measured diffusion scales like the square of the quadrupole field strength, inversely like the square of the axial magnetic field and. below resonance, like the square of the E x B rotation frequency. The location of the resonance in parameter space scales accordingly as we vary the length and temperature of the plasma. However, the temperature used in fitting the data differs from the independently measured temperature by a factor of four, suggesting that our description of the effect as purely diffusive is not correct.
Author: Brian Paul Cluggish
Publisher:
ISBN:
Category :
Languages : en
Pages : 368
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Author:
Publisher: Elsevier
ISBN: 0080545025
Category : Science
Languages : en
Pages : 321
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Book Description
This series, established in 1965, is concerned with recent developments in the general area of atomic, molecular and optical physics. The field is in a state of rapid growth, as new experimental and theoretical techniques are used on many old and new problems. Topics covered include related applied areas, such as atmospheric science, astrophysics, surface physics and laser physics. Articles are written by distinguished experts who are active in their research fields. The articles contain both relevant review material and detailed descriptions of important recent developments. · Reviews timely fields of atomic physics · Articles written by world leaders in those fields · In depth review of the subject with relevant literature · Suitable for researchers in other fields · Only book series of this kind
Author: Francois Anderegg
Publisher: American Inst. of Physics
ISBN: 9780735400504
Category : Science
Languages : en
Pages : 768
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Book Description
Non-neutral plasmas are clouds of electrons or ions or anti-matter particles contained in a vacuum by magnetic and electric fields. Experiments on these simplest of plasmas give precise tests of basic theories of equilibrium, waves, and cross-field transport. Technical applications include positron beams, mass spectroscopy, quantum computing, and beams for free-electron lasers.
Author: Jason Michael Kriesel
Publisher:
ISBN:
Category :
Languages : en
Pages : 424
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Author: Jonathan Hwa-Jing Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 236
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Author: Chi Yung Chim
Publisher:
ISBN:
Category :
Languages : en
Pages : 171
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First in Chapter 2, we discuss the collisional relaxation of a strongly magnetized pure ion plasma that is composed of two species with slightly different masses, but both with singly-ionized atoms. In a limit of high cyclotron frequencies [omega]j, the total cyclotron action Ij for the two species are adiabatic invariants. In a few collisions, maximizing entropy yields a modified Gibbs distribution of the form exp[-H/T_para-[alpha]1 I1-[alpha]2 I2]. Here, H is the total Hamiltonian and [alpha]j's are related to parallel and perpendicular temperatures through 1/T_(perp,j)=1/T_para+[alpha]j/[omega]j. On a longer timescale, the two species share action so that [alpha]1 and [alpha]2 relax to a common value $\alpha$. On an even longer timescale, the total action ceases to be a constant of the motion and $\alpha$ relaxes to zero. Next, weak transport produces a low density halo of electrons moving radially outward from the pure electron plasma core, and the m=1 mode begins to damp algebraically when the halo reaches the wall. The damping rate is proportional to the particle flux through the resonant layer at the wall. Chapter 3 explains analytically the new algebraic damping due to both mobility and diffusion transport. Electrons swept around the resonant "cat's eye" orbits form a dipole m=1 density distribution, setting up a field that produces ExB-drift of the core back to the axis, that is, damps the mode. Finally, Chapter 4 provides a simple mechanistic interpretation of the resonant wave-particle interaction of Landau. For the simple case of a Vlasov plasma oscillation, the non-resonant electrons are driven resonantly by the bare electric field from the resonant electrons, and this complex driver field is of a phase to reduce the oscillation amplitude. The wave-particle resonant interaction also occurs in 2D ExB-drift waves, such as a diocotron wave. In this case, the bare electric field from the resonant electrons causes ExB-drift motion back in the core plasma, thus damping the wave.
Author: Vladimir Vyacheslavovich Gorgadze
Publisher:
ISBN:
Category :
Languages : en
Pages : 378
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Author: Michael Drewsen
Publisher: American Inst. of Physics
ISBN: 9780735403604
Category : Science
Languages : en
Pages : 352
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Book Description
This book contains the proceedings of the Workshop on Non-Neutral Plasmas 2006. The Workshop focused on fundamental questions regarding confinement and dynamics of one-component plasmas as well as the relevance of these subjects to other related topics in physics, such as antimatter research, accelerator physics, atomic physics, and dusty plasmas.
Author: William Alan Bertsche
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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