Diagnostics for intense heavy-ion beams in the HIF-VNL

Bieniosek, F.M.; Eylon, S.; Faltens, A.; Friedman, A.; Kwan, J.W.; Leitner, M.; Molvik, A.W.; Prost, L.; Roy, P.K.; Seidl, P.A.; Westenskow, G.A.

doi:10.1016/j.nima.2005.01.220

Cited by 25 publications

(14 citation statements)

References 13 publications

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“…One method used an upstream slit and a downstream slit and a Faraday collector (slit cup). The second method used a 100-m thick alumina scintillator and an image-intensified gated-CCD camera that imaged beam-induced light emission after masking the beam with a single upstream slit [34]. The transverse beam distribution Jx; y was also measured using beam-induced light emission from the scintillator.…”

Section: Introductionmentioning

confidence: 99%

Measured gas desorption and electron cloud effects with an intense ion beam in a solenoid lattice

Coleman

Seidl

Vay

et al. 2008

Phys. Rev. ST Accel. Beams

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Electron cloud and gas measurements were conducted in a solenoid lattice with a 10 s, singly charged K ion bunch at an ion energy of 0.3 MeV and currents of 26 and 45 mA. The principal objective of these experiments is to control electrons and understand their impact on the beam dynamics. Electron clearing measurements indicate an electron density close to 1% of the beam density in the solenoid lattice is enough to partially neutralize the beam and cause the emittance to grow 40%. A new method of measuring the dynamics of beam-induced gas desorption, ionization, and electron emission for normal incidence is also presented. Stainless steel and copper targets exposed to a beam intensity of 1:6 10 12 ions=pulse show ionized gas and electron densities approach the beam density in a single pulse. These measurements also show the gas cloud expands as a function of time and the dynamics are dependent upon the incident material and the bias voltage.

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Section: Introductionmentioning

confidence: 99%

Measured gas desorption and electron cloud effects with an intense ion beam in a solenoid lattice

Coleman

Seidl

Vay

et al. 2008

Phys. Rev. ST Accel. Beams

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“…For example, space-charge waves are widely thought to have potential as a beam diagnostic to measure quantities that appear in the sound speed [22,23,39]. The presence of two counter-propagating waves of similar shape will lead to interference effects [8], which may enhance the precision of such techniques.…”

Section: Observations On Energy Conversionmentioning

confidence: 99%

Longitudinal density modulation and energy conversion in intense beams

et al. 2007

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Density modulation of charged particle beams may occur as a consequence of deliberate action, or may occur inadvertently because of imperfections in the particle source or acceleration method. In the case of intense beams, where space charge and external focusing govern the beam dynamics, density modulation may under some circumstances be converted to velocity modulation, with a corresponding conversion of potential energy to kinetic energy. Whether this will occur depends on the properties of the beam and the initial modulation. This paper describes the evolution of discrete and continuous density modulations on intense beams, and discusses three recent experiments related to the dynamics of density-modulated electron beams. PACS

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“…We can measure the effects of electrons with slit scans, either conventional double slit [7] or optical slit scans with either solenoids and quadrupoles [32]; and we have developed techniques to measure the absolute value of the electron density in quadrupoles [1]. In solenoids, we need to develop and validate tools to measure the electron accumulation.…”

Section: Issuementioning

confidence: 99%

Critical issues for high-brightness heavy-ion beams --prioritized

Molvik¹,

Cohen²,

Davidson³

et al. 2007

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SUMMARYThis study group was initiated to consider whether there were any "show-stopper" issues with accelerators for heavy-ion warm-dense matter (WDM) and heavy-ion inertial fusion energy (HIF), and to prioritize them. Showstopper issues would appear as limits to beam current; that is, the beam would be well-behaved below the current limit, and significantly degraded in current or emittance if the current limit were exceeded at some region of an accelerator. We identified 14 issues: 1-6 could be addressed in the near term, 7-10 are potentially attractive solutions to performance and cost issues but are not yet fully characterized, 11-12 involve multibeam effects that cannot be more than partially studied in near-term facilities, and 13-14 involve new issues that are present in some novel driver concepts. Comparing the issues with the new experimental, simulation, and theoretical tools that we have developed, it is apparent that our new capabilities provide an opportunity to re-examine and significantly increase our understanding of the number one issue -halo growth and mitigation.

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Diagnostics for intense heavy-ion beams in the HIF-VNL

Cited by 25 publications

References 13 publications

Measured gas desorption and electron cloud effects with an intense ion beam in a solenoid lattice

Measured gas desorption and electron cloud effects with an intense ion beam in a solenoid lattice

Longitudinal density modulation and energy conversion in intense beams

Critical issues for high-brightness heavy-ion beams --prioritized

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