Results on intense beam focusing and neutralization from the neutralized beam experiment

Roy, P.K.; Yu, S.S.; Eylon, S.; Henestroza, E.; Anders, André; Bieniosek, F.M.; Greenway, W.; Logan, B.G.; Waldron, W.L.; Vanecek, D.; Welch, D. R.; Rose, D. V.; Davidson, Ronald C.; Efthimion, P. C.; Gilson, Erik; Sefkow, A. B.; Sharp, W.M.

doi:10.1063/1.1652712

Cited by 65 publications

(33 citation statements)

References 26 publications

(19 reference statements)

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“…The tail of the beam then catches up with the head, achieving a factor of 60 compression to a duration of 3 ns [6]. Neutralization of a beam after the focusing magnets, but not within them, focused a beam to a radius of 0.11 cm, compared with a radius of 1.4 cm with minimal neutralization [7]. These new capabilities will enable near term WDM experiments using ion beams to heat targets to ~1 eV temperatures [4].…”

Section: Introductionmentioning

confidence: 98%

Quantitative experiments with electrons in a positively charged beam

et al. 2007

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Intense ion beams are an extreme example of, and difficult to maintain as, a non-neutral plasma. Experiments and simulations are used to study the complex interactions between beam ions and (unwanted) electrons. Such "electron clouds" limit the performance of many accelerators. To characterize electron clouds, a number of parameters are measured including: total and local electron production and loss for each of three major sources, beam potential versus time, electron line-charge density, and gas pressure within the beam. Electron control methods include surface treatments to reduce electron and gas emission, and techniques to remove, or block, electrons from the beam. Detailed, selfconsistent simulations include beam-transport fields, and electron and gas generation and transport, to compute unexpectedly rich behavior, much of which is confirmed experimentally. For example, in a quadrupole magnetic field, ion and dense electron plasmas interact to produce multi-kV oscillations in the electron plasma and distortions of the beam velocity space distribution, without becoming homogenous or locally neutral.[159 words, ~150 allowed] 2

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Section: Introductionmentioning

confidence: 98%

Quantitative experiments with electrons in a positively charged beam

et al. 2007

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“…Details of the ion beamline are presented elsewhere. [27][28][29] The diagnostic was installed in the 1 m drift section. The steady e-beam was directed perpendicular to the ion beam axis.…”

Section: Results Of Ion Beam Profile Measurementsmentioning

confidence: 99%

Electron-beam diagnostic for space-charge measurement of an ion beam

Roy

Henestroza

et al. 2005

Review of Scientific Instruments

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A nonperturbing electron-beam diagnostic system for measuring the charge distribution of an ion beam is developed for heavy ion fusion beam physics studies. Conventional diagnostics require temporary insertion of sensors into the beam, but such diagnostics stop the beam, or significantly alter its properties. In this diagnostic a low energy, low current electron beam is swept transversely across the ion beam; the measured electron-beam deflection is used to infer the charge density profile of the ion beam. The initial application of this diagnostic is to the neutralized transport experiment (NTX), which is exploring the physics of space-charge-dominated beam focusing onto a small spot using a neutralizing plasma. Design and development of this diagnostic and performance with the NTX ion beamline is presented.

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“…At the very high space-charge intensities characteristic of intense heavy ion beams, one of the major challenges is compressing the charge bunch axially (against space-charge forces) to the very short pulse length ideal for maximizing the beam intensity (number density) focused on the target. To facilitate the compression, one approach now under active theoretical and experimental investigation [23][24][25] is called neutralized drift compression. In neutralized drift compression, the space charge and current of the intense ion charge bunch are neutralized by the electrons from a dense background plasma.…”

Section: Introductionmentioning

confidence: 99%

Kinetic description of neutralized drift compression and transverse focusing of intense ion charge bunches

Davidson

Qin

2005

Phys. Rev. ST Accel. Beams

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A kinetic model based on the Vlasov equation is used to describe the axial drift compression and transverse focusing of an intense ion charge bunch propagating along the axis of a solenoidal focusing field B sol x. The space charge and current of the ion charge bunch are assumed to be completely neutralized by the electrons provided by a dense background plasma. In the absence of self-field forces, the Vlasov equation is solved exactly for general initial distribution function f b x; v; 0, using the method of characteristics. It is shown that the Vlasov equation possesses a class of exact, dynamically evolving solutions f b W ? ; W z , where W ? and W z are transverse and longitudinal constants of the motion. Detailed dynamical properties of the charge bunch are calculated during axial compression and transverse focusing for several choices of distribution function f b W ? ; W z .

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Results on intense beam focusing and neutralization from the neutralized beam experiment

Cited by 65 publications

References 26 publications

Quantitative experiments with electrons in a positively charged beam

Quantitative experiments with electrons in a positively charged beam

Electron-beam diagnostic for space-charge measurement of an ion beam

Kinetic description of neutralized drift compression and transverse focusing of intense ion charge bunches

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