Progress in heavy ion target capsule and hohlraum design

Callahan, D. A.; Herrmann, Mark; Tabak, M.

doi:10.1017/s0263034602203079

Cited by 30 publications

(23 citation statements)

References 4 publications

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“…Different versions of this target have been shown to allow longer-range ions [6], different ion stopping profiles [7], and smaller case-tocapsule ratios [7]. For the point design, a further modification of the target was made to accommodate illumination from an array of beams with a maximum extent from centerline of 24 degrees (rather than 12 degrees in the previous version) [8]. This change was needed to accommodate the number of beams together with the magnet and shielding requirements for the RPD.…”

Section: Targetmentioning

confidence: 99%

An Updated Point Design for Heavy Ion Fusion

Meier

Abbott

et al. 2003

Fusion Science and Technology

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An updated, self-consistent point design for a heavy ion fusion (HIF) power plant based on an induction linac driver, indirect-drive targets, and a thick liquid wall chamber has been completed. Conservative parameters were selected to allow each design area to meet its functional requirements in a robust manner, and thus this design is referred to as the Robust Point Design (RPD-2002). This paper provides a top-level summary of the major characteristics and design parameters for the target, driver, final focus magnet layout and shielding, chamber, beam propagation to the target, and overall power plant.

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Section: Targetmentioning

confidence: 99%

An Updated Point Design for Heavy Ion Fusion

Meier

Abbott

et al. 2003

Fusion Science and Technology

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“…Cylindrical hohlraum, indirect drive targets.-Detailed designs include the ''distributed radiator'' targets [54,55], and their close relatives the ''closely coupled target'' [54,56] and the ''hybrid'' target [57]. These are the most mature HIF target designs, with integrated 2D models having gains ranging from 60-130 for 3-7 MJ input energy.…”

Section: Target Physicsmentioning

confidence: 99%

Research and development toward heavy ion driven inertial fusion energy

Seidl

Barnard

Faltens

et al. 2013

Phys. Rev. ST Accel. Beams

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We describe near-term heavy ion fusion (HIF) research objectives associated with developing an inertial fusion energy demonstration power plant. The goal of this near-term research is to lay the essential groundwork for an intermediate research experiment (IRE), designed to demonstrate all the key driver beam manipulations at a meaningful scale, and to enable HIF relevant target physics experiments. This is a very large step in size and complexity compared to HIF experiments to date, and if successful, it would justify proceeding to a demonstration fusion power plant. With an emphasis on accelerator research, this paper is focused on the most important near-term research objectives to justify and to reduce the risks associated with the IRE. The chosen time scale for this research is 5-10 years, to answer key questions associated with the HIF accelerator drivers, in turn enabling a key decision on whether to pursue a much more ambitious and focused inertial fusion energy research and development program. This is consistent with the National Academies of Sciences Review of Inertial Fusion Energy Systems Interim Report, which concludes that ''it would be premature at the present time to choose a particular driver approach. . .'' and encouraged the continued development of community consensus on critical issues, and to develop ''options for a community-based roadmap for the development of inertial fusion as a practical energy source.''

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“…Au low-density converters of heavy ions energy to x-rays should have their density varying from 10 mg/cm 3 to 400 mg/cm 3 [7]. Unlike polymers, metal foams are heat conductive and allow cryo-layer formation in fuel capsule of the target by rapid cooling (quench).…”

Section: Direct-indirect Targets Schemesmentioning

confidence: 99%

“…Rosen and J.H. Hammer proved [5], and observed experimentally [6], that x-ray temperature in gold low-density converter is higher than in ordinary Au-converter of indirect-drive targets.Au low-density converters of heavy ions energy to x-rays should have their density varying from 10 mg/cm 3 to 400 mg/cm 3 [7]. Unlike polymers, metal foams are heat conductive and allow cryo-layer formation in fuel capsule of the target by rapid cooling (quench).…”

mentioning

confidence: 99%

Laser study into and explanation of the direct-indirect target concept

Борисенко

Chaurasia

Dhareshwar

et al. 2013

EPJ Web of Conferences

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Abstract. The idea of direct-indirect target is experimentally tested with planar targets from LPI made of low-density metal foam (nanosnow) or of nanoparticles (30%) in plastic aerogels. The laser experiments in BARC have shown that compared to plain targets the foams of/with nanoparticles demonstrate: 1) better x-ray emissivity ; 2) smoother energy distribution over the target surface; 3) material flow from low-density wall being slower and more uniform; 4) active transverse energy transport over the target plane. These properties could be useful for hohlraums and direct-indirect concept. DIRECT-INDIRECT TARGETS SCHEMESPlasma from foams has been studied for decades [1 and ref.], but Au and Bi are not studied enough. The design of direct-indirect target using a 0.25 m-thick outer gold shell was suggested in [2]. The advantage of this design was in the easy process of laser focusing. Disadvantages, such as low x-ray efficiency, necessity of short laser pulse duration and high velocity of Au-plasma were consequent.Another design shown in Fig. 1 was proposed by Yu.A. Merkul'ev [3]. This is a target with Au-lowdensity converter which allows easy laser focusing and long laser pulse. As the result, the Au-plasma motion is slower, but the x-ray efficiency is still low. One more design, shown in Fig. 2, was proposed in [4]. The target with low-density absorber-converter was invented for 2 MJ 5 ns laser pulses. Easy laser focusing, possibility of long laser pulse and high efficiency for 0.53 m wavelength are among its advantages. However with mixed interaction (both x-ray and thermal) taking place in this case, the cryogenic DT layer is difficult to keep.M.D. Rosen and J.H. Hammer proved [5], and observed experimentally [6], that x-ray temperature in gold low-density converter is higher than in ordinary Au-converter of indirect-drive targets.Au low-density converters of heavy ions energy to x-rays should have their density varying from 10 mg/cm 3 to 400 mg/cm 3 [7]. Unlike polymers, metal foams are heat conductive and allow cryo-layer formation in fuel capsule of the target by rapid cooling (quench).Low-density Au is being developed in LLNL and GA, USA, as well as in LPI (Russia). METAL FOAMS PRODUCTION FOR DIFFERENT DENSITIESNo universal fabrication methods exist for high-Z low-density metals in a wide density range. Various technology routes of metal low-density layers are realized for

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Progress in heavy ion target capsule and hohlraum design

Cited by 30 publications

References 4 publications

An Updated Point Design for Heavy Ion Fusion

An Updated Point Design for Heavy Ion Fusion

Research and development toward heavy ion driven inertial fusion energy

Laser study into and explanation of the direct-indirect target concept

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