scholarly journals Evaluation of Negative-Ion-Beam Driver Concepts for Heavy Ion Fusion

2003 ◽  
Vol 43 (2) ◽  
pp. 191-199 ◽  
Author(s):  
Larry R. Grisham
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Negative Ion ◽  
Heavy Ion Fusion

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.

Intense-heavy-ion-beam transport through an insulator beam guide for heavy ion fusion

1999 ◽  
Author(s):  
Takashi Kikuchi ◽  
Shigeo Kawata ◽  
Shigeru Kato ◽  
Susumu Hanamori ◽  
Masaru Yazawa
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Beam Transport ◽  
Heavy Ion Beam ◽  
Heavy Ion Fusion

scholarly journals Integrated experiments for heavy ion fusion

2003 ◽  
Vol 21 (4) ◽  
pp. 553-560 ◽  
Author(s):  
J.J. BARNARD ◽  
L.E. AHLE ◽  
F.M. BIENIOSEK ◽  
C.M. CELATA ◽  
R.C. DAVIDSON ◽  
...  
Keyword(s):  
Ion Beam ◽  
National Laboratory ◽  
Heavy Ion ◽  
Trade Offs ◽  
Integrated Research ◽  
Beam Experiment ◽  
Research Experiment ◽  
Significant Line ◽  
Induction Accelerator ◽  
Heavy Ion Fusion

We describe the next set of experiments proposed in the U.S. Heavy Ion Fusion Virtual National Laboratory, the so-called Integrated Beam Experiment (IBX). The purpose of IBX is to investigate in an integrated manner the processes and manipulations necessary for a heavy ion fusion induction accelerator. The IBX experiment will demonstrate injection, acceleration, compression, bending, and final focus of a heavy ion beam at significant line charge density. Preliminary conceptual designs are presented and issues and trade-offs are discussed. Plans are also described for the step after IBX, the Integrated Research Experiment (IRE), which will carry out significant target experiments.

scholarly journals Effects of preneutralization on heavy ion fusion chamber transport

2002 ◽  
Vol 20 (4) ◽  
pp. 621-625 ◽  
Author(s):  
D.R. WELCH ◽  
D.V. ROSE ◽  
W.M. SHARP ◽  
C.L. OLSON ◽  
S.S. YU
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Spot Size ◽  
Target Chamber ◽  
Beam Emittance ◽  
Particle In Cell ◽  
Beam Parameters ◽  
Background Gas ◽  
Beam Currents ◽  
Heavy Ion Fusion

Beams for heavy ion fusion are likely to require at least partial neutralization in the reactor chamber. Present target designs call for higher beam currents and smaller focal spots than most earlier designs, leading to high space-charge fields. Focusing is complicated by beam stripping in the low-pressure background gas expected in chambers. One method proposed for neutralization is passing an ion beam through a plasma before the beam enters the chamber. In this article, the electromagnetic particle-in-cell code LSP is used to study the effectiveness of this form of preneutralization for a range of plasma and beam parameters. For target chamber pressures below a few milliTorr of flibe gas, preneutralization is found to significantly reduce the beam emittance growth and spot size in the chamber.

scholarly journals Overview of theory and modeling in the heavy ion fusion virtual national laboratory

2002 ◽  
Vol 20 (3) ◽  
pp. 377-384 ◽  
Author(s):  
R.C. DAVIDSON ◽  
I.D. KAGANOVICH ◽  
W.W. LEE ◽  
H. QIN ◽  
E.A. STARTSEV ◽  
...  
Keyword(s):  
Ion Beam ◽  
National Laboratory ◽  
Three Dimensional ◽  
Development Program ◽  
Heavy Ion ◽  
Target Chamber ◽  
Temperature Anisotropy ◽  
Particle In Cell ◽  
Beam Experiment ◽  
Heavy Ion Fusion

This article presents analytical and simulation studies of intense heavy ion beam propagation, including the injection, acceleration, transport and compression phases, and beam transport and focusing in background plasma in the target chamber. Analytical theory and simulations that support the High Current Experiment (HCX), the Neutralized Transport Experiment (NTX), and the advanced injector development program, are being used to provide a basic understanding of the nonlinear beam dynamics and collective processes, and to develop design concepts for the next-step Integrated Beam Experiment (IBX), an Integrated Research Experiment (IRE), and a heavy ion fusion driver. Three-dimensional nonlinear perturbative simulations have been applied to collective instabilities driven by beam temperature anisotropy, and to two-stream interactions between the beam ions and any unwanted background electrons; three-dimensional particle-in-cell simulations of the 2-MV electrostatic quadrupole (ESQ) injector have clarified the influence of pulse rise time; analytical studies and simulations of the drift compression process have been carried out; syntheses of a four-dimensional particle distribution function from phase-space projections have been developed; and studies of the generation and trapping of stray electrons in the beam self-fields have been performed. Particle-in-cell simulations, involving preformed plasma, are being used to study the influence of charge and current neutralization on the focusing of the ion beam in NTX and in a fusion chamber.

scholarly journals Proof-of-Concept Experiments for Negative Ion Driver Beams for Heavy Ion Fusion

2003 ◽  
Author(s):  
L.R. Grisham ◽  
S.K. Hahto ◽  
S.T. Hahto ◽  
J.W. Kwan ◽  
K.N. Leung
Keyword(s):  
Heavy Ion ◽  
Negative Ion ◽  
Proof Of Concept ◽  
Heavy Ion Fusion
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