Three-dimensional numerical studies of the temperature anisotropy instability in intense charged particle beams

Startsev, Edward A.; Davidson, Ronald C.; Qin, Hong

doi:10.1016/j.nima.2005.01.201

Cited by 8 publications

(10 citation statements)

References 12 publications

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“…4 of Ref. [28].) Saturation values of T k consistent with these thresholds were also observed ( Fig.…”

Section: F Beam Temperature Anisotropy Instabilitysupporting

confidence: 68%

“…In a recent series of papers, Startsev, Davidson, and Qin [25][26][27][28][29][30][31] have analyzed and simulated the stability properties of intense non-neutral charged particle beams with large temperature anisotropy. They show that an electrostatic Harris-like instability [32] may develop in such beams and is a potential source of deterioration of beam quality (growth of T k and longitudinal beam emittance).…”

Section: F Beam Temperature Anisotropy Instabilitymentioning

confidence: 99%

See 1 more Smart Citation

Source-to-target simulation of simultaneous longitudinal and transverse focusing of heavy ion beams

Welch

Coleman

Seidl

et al. 2008

Phys. Rev. ST Accel. Beams

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Longitudinal bunching factors in excess of 70 of a 300-keV, 27-mA K ion beam have been demonstrated in the neutralized drift compression experiment [P. K. Roy et al., Phys. Rev. Lett. 95, 234801 (2005)] in rough agreement with particle-in-cell source-to-target simulations. A key aspect of these experiments is that a preformed plasma provides charge neutralization of the ion beam in the last one meter drift region where the beam perveance becomes large. The simulations utilize the measured ion source temperature, diode voltage, and induction-bunching-module voltage waveforms in order to determine the initial beam longitudinal phase space which is critical to accurate modeling of the longitudinal compression. To enable simultaneous longitudinal and transverse compression, numerical simulations were used in the design of the solenoidal focusing system that compensated for the impact of the applied velocity tilt on the transverse phase space of the beam. Complete source-to-target simulations, that include detailed modeling of the diode, magnetic transport, induction bunching module, and plasma neutralized transport, were critical to understanding the interplay between the various accelerator components in the experiment. Here, we compare simulation results with the experiment and discuss the contributions to longitudinal and transverse emittance that limit the final compression.

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“…4 of Ref. [28].) Saturation values of T k consistent with these thresholds were also observed ( Fig.…”

Section: F Beam Temperature Anisotropy Instabilitysupporting

confidence: 68%

Section: F Beam Temperature Anisotropy Instabilitymentioning

confidence: 99%

Source-to-target simulation of simultaneous longitudinal and transverse focusing of heavy ion beams

Welch

Coleman

Seidl

et al. 2008

Phys. Rev. ST Accel. Beams

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show abstract

“…As shown in previous studies, 5,6,8,9,11 the dipole mode has the highest growth rate, and for T ʈb = 0 the growth rate is an increasing function of k z r b and approaches a maximum value for k z 2 r b 2 ӷ 1. As shown in previous studies, 5,6,8,9,11 the dipole mode has the highest growth rate, and for T ʈb = 0 the growth rate is an increasing function of k z r b and approaches a maximum value for k z 2 r b 2 ӷ 1.…”

Section: The Electrostatic Harris Instabilitysupporting

confidence: 79%

“…Of particular importance at the high beam currents and charge densities of practical interest are the effects of the intense self-fields produced by the beam space charge and current on determining the detailed equilibrium, stability, and transport properties. Two such instabilities are the electrostatic Harris instability 5,6,8,9,11,14 and the electromagnetic Weibel instability, 7,15 both driven by a large temperature anisotropy that develops naturally in accelerators. 4 A characteristic feature of such plasmas is the nonuniformity of the equilibrium density profiles and the nonlinearity of the self-fields, which makes detailed analytical investigation difficult.…”

Section: Introductionmentioning

confidence: 99%

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Collective temperature anisotropy instabilities in intense charged particle beams

2007

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The classical electrostatic Harris instability and the electromagnetic Weibel instability, both driven by a large temperature anisotropy ͑T ʈb / T Ќb Ӷ 1͒ that develops naturally in accelerators, are generalized to the case of a one-component intense charged particle beam with anisotropic temperature, including the important effects of finite transverse geometry and beam space-charge. Such instabilities may lead to an increase in the longitudinal velocity spread, which makes focusing the beam difficult, and may impose a limit on the beam luminosity and the minimum spot size achievable in focusing experiments. This paper describes recent advances in the theory and simulation of collective instabilities in intense charged particle beams caused by large temperature anisotropy. The new simulation tools that have been developed to study these instabilities are also described. Results of the investigations that identify the instability growth rates, levels of saturations, and conditions for quiescent beam propagation are also discussed.

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Survey of collective instabilities and beam–plasma interactions in intense heavy ion beams

Davidson

Dorf

Kaganovich

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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This paper presents a survey of the present theoretical understanding based on advanced analytical and numerical studies of collective processes and beam-plasma interactions in intense heavy ion beams for applications to ion-beam-driven high energy density physics and heavy ion fusion. The topics include: discussion of the conditions for quiescent beam propagation over long distances; and the electrostatic Harris instability and the transverse electromagnetic Weibel instability in highly anisotropic, intense one-component ion beams. In the longitudinal drift compression and transverse compression regions, collective processes associated with the interaction of the intense ion beam with a charge-neutralizing background plasma are described, including the electrostatic electron-ion two-stream instability, the multispecies electromagnetic Weibel instability, and collective excitations in the presence of a solenoidal magnetic field. The effects of a velocity tilt on reducing two-stream instability growth rates are also discussed.Operating regimes are identified where the possible deleterious effects of collective processes on beam quality are minimized.

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Three-dimensional numerical studies of the temperature anisotropy instability in intense charged particle beams

Cited by 8 publications

References 12 publications

Source-to-target simulation of simultaneous longitudinal and transverse focusing of heavy ion beams

Source-to-target simulation of simultaneous longitudinal and transverse focusing of heavy ion beams

Collective temperature anisotropy instabilities in intense charged particle beams

Survey of collective instabilities and beam–plasma interactions in intense heavy ion beams

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