9 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "Cuneo, M. E."

open access

Light ion sources and target results on PBFA II (Particle Beam Fusion Accelerator II)

Advances in ion beam theory, diagnostics, and experiments in the past two years have enabled efficient generation of intense proton beams on PBFA II, and focusing of the beam power to 5.4 TW/cm{sup 2} on a 6-mm-diameter target. Target experiments have been started with the intense proton beams, since the range of protons at 4--5 MeV is equivalent to that of lithium at 30 MeV. Three series of experiments have been conducted using planar, conical, and cylindrical targets. These tests have provide… more

Date: January 1, 1990

Creator: Cook, D. L.; Bailey, J. E.; Bieg, K. W.; Bloomquist, D. D.; Coats, R. S.; Chandler, G. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Beam transport

Transport and focusing of light ion beams for inertial confinement fusion is discussed, including transport schemes, gas breakdown research, and a strategy for divergence reduction.

Date: December 31, 1993

Creator: Olson, C. L.; Cuneo, M. E. & Desjarlais, M. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cleaning techniques for applied-B ion diodes

Measurements and theoretical considerations indicate that the lithium-fluoride (LiF) lithium ion source operates by electron-assisted field-desorption, and provides a pure lithium beam for 10--20 ns. Evidence on both the SABRE (1 TW) and PBFA-II (20 TW) accelerators indicates that the lithium beam is replaced by a beam of protons, and carbon resulting from electron thermal desorption of hydrocarbon surface and bulk contamination with subsequent avalanche ionization. Appearance of contaminant io… more

Date: September 1, 1995

Creator: Cuneo, M. E.; Menge, P. R. & Hanson, D. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A light ion beam driver for the Laboratory Microfusion Facility

The Laboratory Microfusion Facility (LMF) is being planned to develop high-grain, high-yield (200 MJ-1000 MJ) ICF targets for applications to nuclear weapons effects simulation, thermonuclear weapons physics, and energy production. It is expected that a 1000-MJ yield will require {approximately}10--20 MJ input energy to the target. The light-ion beam driver concept for the LMF consists of 36 accelerator modules that drive independent Li{sup +} ion diodes. Each ion beam is extracted from an annu… more

Date: January 1, 1990

Creator: Ramirez, J. J.; Prestwich, K. R.; Stinnett, R. W.; Johnson, D. L.; Olson, C. L.; Allshouse, G. O. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

LIF standoff research

Present LIF target experiments on PBFA II use a barrel diode in which the total transport length from the anode to the target is {le} 15 cm. Future LIF development includes high yield applications (LMF) and energy production (ETF and LIBRA power plants) that require standoff - the generation of extracted ion beams and transport of these beams over distances of several meters. Standoff research includes the development of high efficiency extraction diodes (single stage and two-stage), improvemen… more

Date: September 1, 1994

Creator: Olson, C. L.; Cuneo, M. E.; Desjarlais, M. P.; Filuk, A. B.; Hanson, D. L.; Lockner, T. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Observation of reflected waves on the SABRE positive polarity inductive adder MITL

We are studying the coupling of extraction applied-B ion diodes to Magnetically Insulated Transmission Line (MITLs) on the SABRE (Sandia Accelerator and Beam Research Experiment, 6 MV, 300 kA) positive polarity inductive voltage adder. Our goal is to determine conditions under which efficient coupling occurs. The best total power efficiency for an ideal ion diode load (i.e., without parasitic losses) is obtained by maximizing the product of cathode current and gap voltage. MITLs require that th… more

Date: August 1, 1993

Creator: Cuneo, M. E.; Poukey, J. W.; Mendel, C. W.; Rosenthal, S. E.; Hanson, D. L.; Smith, J. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

X-Ray-Spectroscopy of Astrophysically-Relevant Photoionized Iron Plasmas at Z

In order to provide benchmark data for models used to interpret X-ray astronomy data from newly-launched orbital telescopes such as Chandra, they have used 120 TW, 180 eV pinch plasmas on the Sandia Z facility to drive iron foils into X-ray photoionized equilibrium. The experiment was designed to achieve photoionization parameters characteristic of accretion-powered objects such as X-ray binaries (neutron stars) and active galactic nuclei (black holes). These objects comprise roughly half of ob… more

Date: June 12, 2000

Creator: Heeter, R. F.; Bailey, J. E.; Cuneo, M. E.; Emig, J.; Foord, M. E.; Springer, P. T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Uniform current density and divergence control in high power extraction ion diodes

A theory of radial beam uniformity in extraction ion diodes is presented. The theory is based on a locally one dimensional analysis of the diamagnetic compression of magnetic streamlines and the self consistent determination of the virtual cathode location. The radial dependence of the applied magnetic field is used to determine the critical parameters of this locally one dimensional treatment. The theory has been incorporated into the ATHETA magnetic field code to allow the rapid evaluation of… more

Date: July 1, 1996

Creator: Desjarlais, M. P.; Coats, R. S.; Lockner, T. R.; Pointon, T. D.; Johnson, D. J.; Slutz, S. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advances in Target Design for Heavy-Ion Fusion

Over the past few years, the emphasis in heavy ion target design has moved from the distributed radiator target to the 'hybrid' target because the hybrid target allows a larger beam focal spot than the distributed radiator ({approx} 5 mm radius rather than {approx} 2 mm radius). The larger spot relaxes some of the requirements on the driver, but introduces some new target physics issues. Most notable is the use of shine shields and shims in the hohlraum to achieve symmetry rather than achieving… more

Date: June 21, 2005

Creator: Callahan, D. A.; Tabak, M.; Bennett, G. R.; Cuneo, M. E.; Vesey, R. A.; Nikroo, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department