On the inefficiency of hole boring in fast ignition

Mulser, P.; Schneider, R.

doi:10.1017/s0263034604222108

Cited by 26 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…lead to volume ignition~Hora et al, 1998!. One remarkable alternative is the use of peripheral ignition of a highly precompressed plasma~Hain & Mulser, 2001;Mulser & Bauer, 2004;Mulser & Schneider, 2004;Deutsch, 2004! or the generation of very high density 5 MeV electron beams from petawatt irradiation of a high density precompressed DT plasma, where the electron beam will ignite a controlled fusion reaction wave in a large amount of nearly uncompressed DT fuel producing a very high gain~Nuckolls & Wood, 2002!.…”

Section: Fusion Energymentioning

confidence: 99%

Difference between relativistic petawatt-picosecond laser-plasma interaction and subrelativistic plasma-block generation

Hora

2005

Laser Part. Beams

View full text Add to dashboard Cite

Some preliminary views are presented to the topic "Fast High Density Plasma Blocks Driven by Picosecond Terawatt Lasers" of the UWS-International Workshop 1-4 December 2004 in Sydney, Australia, underlining the motivation to explain the difference between the relativistic and the subrelativistic effects of ps-laser pulse interaction with plasma at powers above TW. This refers to specifically selected experimental and theoretical presentations at the workshop containing results for explaining the differences but also the important applications for studies on the fast ignitor scheme for application on nuclear fusion energy. One of the aims with relativistic proton beams is to realize conditions of spark ignition, while the subrelativistic case implies the generation of fast plasma blocks eventually with the possibility to ignite a fusion flame in uncompressed solid DT fuel for a power station with high efficiency.

show abstract

Section: Fusion Energymentioning

confidence: 99%

Difference between relativistic petawatt-picosecond laser-plasma interaction and subrelativistic plasma-block generation

Hora

2005

Laser Part. Beams

View full text Add to dashboard Cite

show abstract

“…is a new approach to inertial fusion energy in which the ignition process is separated from the compression procedure, and is expected to reduce the criteria for fuel burning. This scheme was explored by experiments with cone-guided targets~Kodama et al, 2001targets~Kodama et al, , 2002 and theoretically investigated with intense lasers as the driver for ignition~Mulser & Bauer, 2004;Mulser & Schneider, 2004!. Ion beams driven by fast electrons~Pegoraro et Shorokhov & Pukhov, 2004!…”

Section: Introductionmentioning

confidence: 99%

Fast ignition integrated interconnecting code project for cone-guided targets

et al. 2006

View full text Add to dashboard Cite

It was reported that the fuel core was heated up to ;0.8 keV in the fast ignition experiments with cone-guided targets, but they could not theoretically explain heating mechanisms and achievement of such high temperature. Thus simulations should play an important role in estimating the scheme performance, and we must simulate each phenomenon with individual codes and integrate them under the fast ignition integrated interconnecting code project. In the previous integrated simulations, fast electrons generated by the laser-plasma interaction were too hot to efficiently heat the core and we got only 0.096 keV rise of temperature. Including the density gap at the contact surface between the cone tip and the imploded plasma, the period of core heating became longer and the core was heated by 0.162 keV, ; 69% higher increment compared with ignoring the density gap effect.

show abstract

“…The core plasma is surrounded by dense plasma; ignition laser energy is transported by converting them to kinetic energy of high energy charged particles, mainly electrons. The phenomena and problems arising from the fast ignition scheme are a subject of current scientific discussion~Mulser & Schneider, 2004;Mulser & Bauer, 2004;Deutsch, 2004;Pegoraro et al, 2004!. In recent experiments of fast ignition, three orders increase of neutron yield and core temperature of 800 eV were observed by using a cone-guided target, where a gold cone is irradiated by a PW laser pulse to generate high energy electrons effectively~Kodama et al, 2001;Baiwen et al, 2004;Malka & Fritzler, 2004!. For the further improvements details of physics involved in fast ignition, fast ignition need to be understood.…”

Section: Introductionmentioning

confidence: 99%

Generation and transport of fast electrons inside cone targets irradiated by intense laser pulses

et al. 2006

View full text Add to dashboard Cite

Fast electrons are effectively generated from solid targets of cone-geometry by irradiating intense laser pulses, which is applied to fast ignition scheme. For realizing optimal core heating by those electrons, understanding the characteristics of electrons emitted from cone targets is crucial. In this paper, in order to understand the generation and transport processes of hot electrons inside the cone target, two-dimensional~2D! particle-in-cell~PIC! simulations were carried out. It is shown that hot electrons form current layers which are guided by self-generated surface magnetic field, which results in effective energy transfer from laser pulse to hot electrons. When the hot electrons propagate through the steep density gradient at the cone tip, electrostatic field is induced via Weibel instability. As a result, hot electrons are confined inside and emitted gradually from the target, as an electron beam of long duration. Energy spectrum and temporal profile of hot electrons are also evaluated at the rear side of the target, where the profile of rear side plasma is taken from the fluid code and the result is sent to Fokker-Planck code.

show abstract

On the inefficiency of hole boring in fast ignition

Cited by 26 publications

References 12 publications

Difference between relativistic petawatt-picosecond laser-plasma interaction and subrelativistic plasma-block generation

Difference between relativistic petawatt-picosecond laser-plasma interaction and subrelativistic plasma-block generation

Fast ignition integrated interconnecting code project for cone-guided targets

Generation and transport of fast electrons inside cone targets irradiated by intense laser pulses

Contact Info

Product

Resources

About