scholarly journals Direct-indirect mixture implosion in heavy ion fusion

2006 ◽  
Vol 24 (3) ◽  
pp. 359-369 ◽  
Author(s):  
TETSUO SOMEYA ◽  
KENTAROU MIYAZAWA ◽  
TAKASHI KIKUCHI ◽  
SHIGEO KAWATA
Keyword(s):  
Inertial Confinement Fusion ◽  
Radiation Transport ◽  
Ion Beam ◽  
Fusion Energy ◽  
Heavy Ion ◽  
Inertial Confinement ◽  
Foam Layer ◽  
Lateral Direction ◽  
Confinement Fusion ◽  
Heavy Ion Fusion

In order to realize an effective implosion, the beam illumination non-uniformity and implosion non-uniformity must be suppressed to less than a few percent. In this paper, a direct-indirect mixture implosion mode is proposed and discussed in heavy ion beam (HIB) inertial confinement fusion (HIF) in order to release sufficient fusion energy in a robust manner. On the other hand, the HIB illumination non-uniformity depends strongly on a target displacement (dz) in a reactor. In a direct-driven implosion mode dz of ∼20 μm was tolerance and in an indirect-implosion mode dz of ∼100 μm was allowable. In the direct-indirect mixture mode target, a low-density foam layer is inserted, and radiation is confined in the foam layer. In the foam layer the radiation transport is expected in the lateral direction for the HIB illumination non-uniformity smoothing. Two-dimensional implosion simulations are performed and show that the HIB illumination non-uniformity is well smoothed. The simulation results present that a large pellet displacement of ∼300 μm is tolerable in order to obtain sufficient fusion energy in HIF.

scholarly journals Uniformity of fuel target implosion in heavy ion fusion

2015 ◽  
Vol 33 (4) ◽  
pp. 591-599
Author(s):  
S. Kawata ◽  
K. Noguchi ◽  
T. Suzuki ◽  
T. Karino ◽  
D. Barada ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Large Scale ◽  
Ion Beam ◽  
Radiation Energy ◽  
Heavy Ion ◽  
Alignment Error ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Rayleigh Taylor Instability ◽  
Heavy Ion Fusion

AbstractIn inertial confinement fusion the target implosion non-uniformity is introduced by a driver beams’ illumination non-uniformity, a fuel target alignment error in a fusion reactor, the target fabrication defect, etc. For a steady operation of a fusion power plant the target implosion should be robust against the implosion non-uniformities. In this paper the requirement for the implosion uniformity is first discussed. The implosion uniformity should be less than a few percent. A study on the fuel hotspot dynamics is also presented and shows that the stagnating plasma fluid provides a significant enhancement of vorticity at the final stage of the fuel stagnation. Then non-uniformity mitigation mechanisms of the heavy-ion beam (HIB) illumination are also briefly discussed in heavy ion inertial fusion (HIF). A density valley appears in the energy absorber, and the large-scale density valley also works as a radiation energy confinement layer, which contributes to a radiation energy smoothing. In HIF a wobbling HIB illumination was also introduced to realize a uniform implosion. In the wobbling HIBs illumination, the illumination non-uniformity oscillates in time and space on a HIF target. The oscillating-HIB energy deposition may contribute to the reduction of the HIBs’ illumination non-uniformity by its smoothing effect on the HIB illumination non-uniformity and also by a growth mitigation effect on the Rayleigh–Taylor instability.

scholarly journals Heavy Ion Beam Illumination Uniformity in Heavy Ion Beam Inertial Confinement Fusion

2004 ◽  
Vol 124 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Tetsuo Someya ◽  
Aleksandar Ogoyski ◽  
Shigeo Kawata ◽  
Toru Sasaki
Keyword(s):  
Inertial Confinement Fusion ◽  
Ion Beam ◽  
Heavy Ion ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Heavy Ion Beam

scholarly journals Numerical Simulation of Radiation-driven Targets for Light-ion Inertial Confinement Fusion

1997 ◽  
Vol 15 (3) ◽  
pp. 461-470 ◽  
Author(s):  
R.E. Olson ◽  
J.J. Macfarlane
Keyword(s):  
Inertial Confinement Fusion ◽  
Ion Beam ◽  
Fusion Energy ◽  
Lithium Ion ◽  
Energy Output ◽  
Inertial Confinement ◽  
Total Input ◽  
Confinement Fusion ◽  
Indirect Drive ◽  
Icf Target

Light ion beam inertial confinement fusion (ICF) is a concept in which intense beams of low atomic number ions would be used to drive ICF targets to ignition and gain. Here, results from numerical simulations are presented describing the operation of an indirect-drive light-ion ICF target designed for a commercial power plant application. The simulations indicate that the ICF target, consisting of an X-ray-driven capsule embedded in a spherical foam-filled hohlraum, will produce a fusion energy output of over 500 MJ when driven with lithium ion beams containing a total input energy of 8 MJ.

Heavy-ion beam inertial-confinement fusion

Nature ◽  
1978 ◽  
Vol 276 (5683) ◽  
pp. 19-23 ◽  
Author(s):  
Richard C. Arnold
Keyword(s):  
Inertial Confinement Fusion ◽  
Ion Beam ◽  
Heavy Ion ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Heavy Ion Beam

Beam Non-Uniformity Smoothing Using Density Valley Formed by Heavy Ion Beam Deposition in Inertial Confinement Fusion Fuel Pellet

2001 ◽  
Vol 40 (Part 1, No. 2B) ◽  
pp. 968-971 ◽  
Author(s):  
Jun Sasaki ◽  
Takashi Nakamura ◽  
Yoshinori Uchida ◽  
Tetsuo Someya ◽  
Kouji Shimizu ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Ion Beam ◽  
Heavy Ion ◽  
Fuel Pellet ◽  
Inertial Confinement ◽  
Ion Beam Deposition ◽  
Confinement Fusion ◽  
Heavy Ion Beam ◽  
Beam Deposition

scholarly journals Low microdivergence medium-mass ion beam produced from a N2O cryogenic diode

2001 ◽  
Vol 19 (2) ◽  
pp. 309-316 ◽  
Author(s):  
KOICHI KASUYA ◽  
YOHSUKE KISHI ◽  
TAKAHIRO KAMIYA ◽  
MASATO FUNATSU
Keyword(s):  
Inertial Confinement Fusion ◽  
Ion Beam ◽  
Fusion Energy ◽  
Ion Source ◽  
Divergence Angle ◽  
Inertial Confinement ◽  
A Value ◽  
Medium Mass ◽  
Confinement Fusion ◽  
Near Future

Medium-mass ion beams including nitrogen and oxygen were produced from a cryogenic diode with N2O ice as the ion source. The nominal diode voltage was 300–400 kV, and the peak ion current was 240 A. The beam divergence angle was measured with a five-aperture time-integrated pinhole camera. The five camera images were analyzed to estimate the spatial distribution of the beam source divergence angle along the anode radius, yielding a value of 5–6 mrad for the average microdivergence. This is low enough for this ion source to be studied further in the near future. If possible, we want to consider this as one of the probable candidate ion sources for ion beam drivers for future inertial confinement fusion (ICF) and inertial fusion energy (IFE) applications.

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