High precision measurements of the fusion excitation functions for the reactions Ca + Pt, Os clearly demonstrate that projectile excitation significantly modifies the potential barrier distribution. In sharp contrast, fusion of O + Sm appears to show no influence of the projectile excitation on the shape of the barrier distribution. These apparently conflicting conclusions are reconciled in thi...

A drift compression and f i n d focus lattice for heavy ion beams should focus the entire bepulse onto the same r o d spot on the tnrget. We show thnt this requircmont implies thnt the drift cornprmion design necds to satisfy a self-similar symmetry condition. Far un-neutmdizcd hems, the Lie symmetry group annlysis i6 applied to the wnrm-fluid model to sy;tematicdly derive thc self-similar drif...

Extensive studies have been performed to optimize the design of superconducting quadrupole arrays for beam transport in future heavy-ion fusion accelerators. In these arrays 20 or more quadrupole coils are densely packed with their axes aligned in parallel. Field strengths between 3 and 5 tesla at the inner coil diameters have been investigated. The aperture of the individual quadrupoles has be...

It is a pleasure to be able to come to Abingdon to help in this study of applications of the Spallatron Neutron Source (SNS) to problems of Heavy Ion Fusion (HIF). I feel that I am in a small way repaying those from Rutherford who have contributed so much to our US HIF workshops. In order to review the US HIF program, it is necessary to discuss both the program elements and the political situat...

We are developing techniques for imaging beams in heavy-ion beam fusion experiments in the HIF-VNL in 2 to 4 transverse dimensions. The beams in current experiments range in energy from 50 keV to 2 MeV, with beam current densities from <10 to 200 mA/cm, and pulse lengths of 4 to 20 μs. The beam energy will range up to 10 MeV in near-future beam experiments. The imaging techniques, based on kapt...

The Neutralized Drift Compression Experiment II (NDCX II) is an induction accelerator planned for initial commissioning in 2012. The final design calls for a 3 MeV, Li+ ion beam, delivered in a bunch with characteristic pulse duration of 1 ns, and transverse dimension of order 1 mm. The NDCX II will be used in studies of material in the warm dense matter (WDM) regime, and ion beam/hydrodynamic ...

A new analytic model is presented which accurately estimates the radially averaged axial component of the space&age field of an axisymmetric heavy-ion beam in a cylindrical beam pipe. The model recovers details of the field near the beam ends that are overlooked by simpler models, and the results compare well to exact solutions of Poisson’s equation. Field values are shown for several simple be...

The High Current Experiment (HCX) at Lawrence Berkeley National Laboratory is part of the US 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 ...

Transverse beam combining is a cost-saving option employed in many designs for induction linac heavy ion fusion drivers. The resultant transverse emittance increase, due predominantly to anharmonic space charge forces, must be kept minimal so that the beam remains focusable at the target. A prototype combining experiment has been built and preliminary results are presented. Four sources each pr...

Measured cross sections for the fusion of Ni with Ni, Ge, and Mo targets are analyzed in a coupled-channels approach. The data for the Ni target above 0.1 mb are reproduced by including couplings to the low-lying 2 and 3 states and the mutual and two-phonon excitations of these states. The calculations become more challenging as the fusing nuclei become softer and heavier, and excitations to mu...