scholarly journals Irradiation of materials with short, intense ion pulses at NDCX-II

2017 ◽  
Vol 35 (2) ◽  
pp. 373-378 ◽  
Author(s):  
P.A. Seidl ◽  
J.J. Barnard ◽  
E. Feinberg ◽  
A. Friedman ◽  
E.P. Gilson ◽  
...  
Keyword(s):  
Space Charge ◽  
Focal Spot ◽  
Short Pulse ◽  
Ion Beam ◽  
Heavy Ion ◽  
Quantitative Comparison ◽  
Inertial Fusion ◽  
Ion Energy ◽  
Particle In Cell ◽  
Maximum Duration

AbstractWe present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and report on recent target experiments on beam-driven melting and transmission ion energy loss measurements with nanosecond and millimeter-scale ion beam pulses and thin tin foils. Bunches with around 1011 ions, 1 mm radius, and 2–30 ns full width at half maximum duration have been created with corresponding fluences in the range of 0.1–0.7 J/cm2. To achieve these short pulse durations and mm-scale focal spot radii, the 1.1 MeV [megaelectronvolt (106 eV)] He+ ion beam is neutralized in a drift compression section, which removes the space charge defocusing effect during final compression and focusing. The beam space charge and drift compression techniques resemble necessary beam conditions and manipulations in heavy ion inertial fusion accelerators. Quantitative comparison of detailed particle-in-cell simulations with the experiment plays an important role in optimizing accelerator performance.

scholarly journals The high current experiment: First results

2002 ◽  
Vol 20 (3) ◽  
pp. 435-440 ◽  
Author(s):  
P.A. SEIDL ◽  
D. BACA ◽  
F.M. BIENIOSEK ◽  
A. FALTENS ◽  
S.M. LUND ◽  
...  
Keyword(s):  
Space Charge ◽  
Ion Beam ◽  
Beam Steering ◽  
Fusion Energy ◽  
National Laboratory ◽  
Heavy Ion ◽  
High Current ◽  
Current Experiment ◽  
First Results ◽  
High Space

The High Current Experiment (HCX) is being assembled at Lawrence Berkeley National Laboratory as part of the U.S. program to explore heavy ion beam transport at a scale representative of the low-energy end of an induction linac driver for fusion energy production. The primary mission of this experiment is to investigate aperture fill factors acceptable for the transport of space-charge dominated heavy ion beams at high space-charge intensity (line-charge density ∼ 0.2 μC/m) over long pulse durations (>4 μs). This machine will test transport issues at a driver-relevant scale resulting from nonlinear space-charge effects and collective modes, beam centroid alignment and beam steering, matching, image charges, halo, lost-particle induced electron effects, and longitudinal bunch control. We present the first experimental results carried out with the coasting K+ ion beam transported through the first 10 electrostatic transport quadrupoles and associated diagnostics. Later phases of the experiment will include more electrostatic lattice periods to allow more sensitive tests of emittance growth, and also magnetic quadrupoles to explore similar issues in magnetic channels with a full driver scale beam.

scholarly journals Driver Technology for Inertial Fusion Research Introduction. Heavy Ion Beam Drivers.

1999 ◽  
Vol 75 (2) ◽  
pp. 121-125
Author(s):  
Masao OGAWA ◽  
Kazuhiko HORIOKA ◽  
Toshiyuki HATTORI
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Inertial Fusion ◽  
Fusion Research ◽  
Heavy Ion Beam

Particle-in-cell techniques for the study of space charge effects in an electrostatic ion beam trap

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Dhanoj Gupta ◽  
Raj Singh ◽  
Ryan Ringle ◽  
Catherine R. Nicoloff ◽  
Igor Rahinov ◽  
...  
Keyword(s):  
Space Charge ◽  
Ion Beam ◽  
Space Charge Effects ◽  
Charge Effects ◽  
Particle In Cell

scholarly journals Heavy-ion beam illumination on a direct-driven pellet in heavy-ion inertial fusion

2004 ◽  
Vol 7 (4) ◽  
Author(s):  
Tetsuo Someya ◽  
Aleksandar I. Ogoyski ◽  
Shigeo Kawata ◽  
Toru Sasaki
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Inertial Fusion ◽  
Heavy Ion Beam

scholarly journals Heavy-ion beam focusing with a wall-stabilized plasma lens

1995 ◽  
Vol 13 (2) ◽  
pp. 221-229 ◽  
Author(s):  
A. Tauschwitz ◽  
E. Boggasch ◽  
D.H.H. Hoffmann ◽  
J. Jacoby ◽  
U. Neuner ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Focal Spot ◽  
Ion Beam ◽  
Heavy Ion ◽  
Spot Size ◽  
High Energy ◽  
Experimental Program ◽  
Focal Spot Size ◽  
Beam Emittance ◽  
Beam Focusing

Focusing of heavy-ion beams is an important issue for ion beam-driven inertial confinement fusion. For the experimental program to investigate matter at high energy densities at GSI, the application of a plasma lens has attractive features compared to standard quadrupole lenses. A plasma lens using a wall-stabilized discharge has been systematically investigated and optimized for this purpose. Different lenses were tested in several runs at the GSI linear accelerator UNILAC and at the SIS-synchrotron. A remarkably high accuracy and reproducibility of the focusing were found. The focal spot size was mainly limited by the beam emittance. A summary of experimental results and important limitations of the focal spot size is given.

Progress in 3D particle-in-cell modeling of heavy ion beam transport in quadrupole focusing channels

2003 ◽  
Author(s):  
A. Friedman ◽  
J.W.-K. Mark ◽  
D.E. Nielsen ◽  
C.-L. Chang ◽  
A.T. Drobot ◽  
...  
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Beam Transport ◽  
Particle In Cell ◽  
Cell Modeling ◽  
Heavy Ion Beam

scholarly journals Effects of the Surface on Displacement Cascades Produced by Heavy-Ion Irradiation of Ni3Al and Cu3Au

1996 ◽  
Vol 439 ◽  
Author(s):  
S. Müller ◽  
M. L. Jenkins ◽  
C. Abromeit ◽  
H. Wollenberger
Keyword(s):  
Ion Irradiation ◽  
Incident Angle ◽  
Ion Beam ◽  
Heavy Ion ◽  
Small Population ◽  
Dislocation Loops ◽  
Near Surface ◽  
Ion Energy ◽  
Heavy Ion Irradiation ◽  
Transmission Electron

AbstractStereo transmission electron microscopy has been used to characterise the distribution in depth of disordered zones and associated dislocation loops in the ordered alloys Ni3Al and Cu3Au after heavy ion irradiation, most extensively for Ni3Al irradiated with 50 keV Ta+ ions at a temperature of 573 K. The Cu3Au specimen was irradiated with 50 keV Ni+ ions at an incident angle of 45° at a temperature of 373 K. In Ni3Al the defect yield, i.e. the probability for a disordered zone to contain a loop was found to be strongly dependent on the depth of the zone in the foil, varying from about 0.7 for near-surface zones to about 0.2 in the bulk. The sizes and shapes of disordered zones were only weakly dependent on depth, except for a small population of zones very near the surface which were strongly elongated parallel to the incident ion beam. In Cu3Au the surface had a smaller but still significant effect on the defect yield. The dependence of the tranverse disordered zone diameter d on ion energy E for Ta+ irradiation of NiA was found to follow a relationship d = k1, E1/α with k, = 2.4 ± 0.4 and α = 3.3 ± 0.4. A similar relationship with the same value of α is valid for a wide variety of incident ion/target combinations found in the literature.

scholarly journals Overview of virtual national laboratory objectives, plans, and projects

2002 ◽  
Vol 20 (3) ◽  
pp. 369-375 ◽  
Author(s):  
B.G. LOGAN ◽  
C.M. CELATA ◽  
J.W. KWAN ◽  
E.P. LEE ◽  
M. LEITNER ◽  
...  
Keyword(s):  
Focal Spot ◽  
National Laboratory ◽  
Heavy Ion ◽  
Beam Current ◽  
Secondary Electrons ◽  
Ion Energy ◽  
Space Potential ◽  
High Beam Current ◽  
Heavy Ion Fusion ◽  
Made In

Significant experimental and theoretical progress has been made in the U.S. heavy ion fusion program on high-current sources, transport, and focusing. Currents over 200 mA have been transported through a matching section and 10 half-lattice periods with electric quadrupoles. An experiment shows control of high-beam current with an aperture, while avoiding secondary electrons. New theory and simulations of the neutralization of intense beam space charge with plasma in various focusing chamber configurations predict that near-emittance-limited beam focal spot sizes can be obtained even with beam perveance (ratio of beam space potential to ion energy) >10× higher than in earlier HIF focusing experiments. Progress in a new focusing experiment with plasma neutralization up to 10−3 perveance, and designs for a next-step experiment to study beam brightness evolution from source to target are described.

Sign in / Sign up

Export Citation Format

Share Document