Impact of Beam Transport Method on Chamber and Driver Design for Heavy Ion Inertial Fusion Energy

Rose, D. V.; Welch, D. R.; Olson, Craig; Yu, S.S.; Neff, S.; Sharp, W.M.

doi:10.13182/fst04-a584

Cited by 5 publications

(2 citation statements)

References 66 publications

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“…To accommodate an velocity tilt on the beam, the perveance must vary as K = Ω L 2 a 2 /β 2 c 2 , which requires the beam current to rise with beam γβ, i.e., of backstreaming electrons. We accomplish this by placing just upstream of the plasma a dipole magnetic field that has been shown to be effective in previous simulations [14].…”

Section: Transition From Vacuum Brillouin Flow To Neutralized Trmentioning

confidence: 99%

Simulations of neutralized final focus

Welch

Rose

Genoni

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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In order to drive an inertial fusion target or study high energy density physics with heavy ion beams, the beam radius must be focused to < 3 mm and the pulselength must be compressed to < 10 ns. The conventional scheme for temporal pulse compression makes use of an increasing ion velocity to compress the beam as it drifts and beam space charge to stagnate the compression before final focus. Beam compression in a neutralizing plasma does not require stagnation of the compression, enabling a more robust method.The final pulse shape at the target can be programmed by an applied velocity tilt. In this paper, neutralized drift compression is investigated. The sensitivity of the compression and focusing to beam momentum spread, plasma, and magnetic field conditions is studied with realistic driver examples. Using the 3D particle-in-cell code, we examine issues associated with self-field generation, stability, and vacuum-neutralized transport transition and focusing.

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Section: Transition From Vacuum Brillouin Flow To Neutralized Trmentioning

confidence: 99%

Simulations of neutralized final focus

Welch

Rose

Genoni

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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“…Olson [48], Rose et al [59], and Davidson et al [23]. The fourth chamber is compatible with a Z-pinch driver.…”

Section: Introductionmentioning

confidence: 99%

Gas Transport and Control in Thick-Liquid Inertial Fusion PowerPlants

Debonnel

2006

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Among the numerous potential routes to a commercial fusion power plant, the inertial path with thick-liquid protection is explored in this doctoral dissertation. Gas dynamics phenomena in such fusion target chambers have been investigated since the early 1990s with the help of a series of simulation codes known as TSUNAMI. For this doctoral work, the code was redesigned and rewritten entirely to enable the use of modern programming techniques, languages and software; improve its user-friendliness; and refine its ability to model thick-liquid protected chambers. The new ablation and gas dynamics code is named "Visual Tsunami" to emphasize its graphics-based pre-and post-processors. It is aimed at providing a versatile and user-friendly design tool for complex systems for which transient gas dynamics phenomena play a key role. Simultaneously, some of these improvements were implemented in a previous version of the code; the resulting code constitutes the version 2.8 of the TSUNAMI series.Visual Tsunami was used to design and model the novel Condensation Debris Experiment (CDE), which presents many aspects of a typical Inertial Fusion Energy (IFE) system and has therefore been used to exercise the code. Numerical and experimental results are in good 2 agreement.In a heavy-ion IFE target chamber, proper beam and target propagation set stringent requirements for the control of ablation debris transport in the target chamber and beam tubes.When the neutralized ballistic transport mode is employed, the background gas density should be adequately low and the beam tube metallic surfaces upstream of the neutralizing region should be free of contaminants. TSUNAMI 2.8 was used for the first simulation of gas transport through the complex geometry of the liquid blanket of a hybrid target chamber and beam lines. Concurrently, the feasibility of controlling the gas density was addressed with a novel beam tube design, which introduces magnetic shutters and a long low-temperature liquid vortex; this beam tube configuration was included in the first thick-liquid heavy-ion fusion point design, the so-called Robust Point Design 2002. Additionally, novel, alternative thick-liquid chambers that can accommodate the assisted-pinch, the solenoidal final-focusing, or a Z-pinch driver are discussed.Prof.

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