George J Caporaso

7173385, Feb 6, 2007

Jan 14, 2005

11/036431

George J. Caporaso - Livermore CA, US
Stephen E. Sampayan - Manteca CA, US
Hugh C. Kirbie - Los Alamos NM, US

The Regents of the University of California - Oakland CA

H05H 9/00

315505, 315500, 315507

A compact linear accelerator having at least one strip-shaped Blumlein module which guides a propagating wavefront between first and second ends and controls the output pulse at the second end. Each Blumlein module has first, second, and third planar conductor strips, with a first dielectric strip between the first and second conductor strips, and a second dielectric strip between the second and third conductor strips. Additionally, the compact linear accelerator includes a high voltage power supply connected to charge the second conductor strip to a high potential, and a switch for switching the high potential in the second conductor strip to at least one of the first and third conductor strips so as to initiate a propagating reverse polarity wavefront(s) in the corresponding dielectric strip(s).

7576499, Aug 18, 2009

Oct 24, 2006

11/586377

George J. Caporaso - Livermore CA, US
Scott D. Nelson - Patterson CA, US
Brian R. Poole - Tracy CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H05H 9/00

315505, 315507, 315500

A sequentially pulsed traveling wave compact accelerator having two or more pulse forming lines each with a switch for producing a short acceleration pulse along a short length of a beam tube, and a trigger mechanism for sequentially triggering the switches so that a traveling axial electric field is produced along the beam tube in synchronism with an axially traversing pulsed beam of charged particles to serially impart energy to the particle beam.

7710051, May 4, 2010

Oct 24, 2006

11/586378

George J. Caporaso - Livermore CA, US
Steven A. Hawkins - Livermore CA, US
Stephen E. Sampayan - Manteca CA, US
Arthur C. Paul - Walnut Creek CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H05H 9/00

315505, 315500, 315507

A compact accelerator system having an integrated particle generator-linear accelerator with a compact, small-scale construction capable of producing an energetic (70-250 MeV) proton beam or other nuclei and transporting the beam direction to a medical therapy patient without the need for bending magnets or other hardware often required for remote beam transport. The integrated particle generator-accelerator is actuable as a unitary body on a support structure to enable scanning of a particle beam by direction actuation of the particle generator-accelerator.

7893541, Feb 22, 2011

Oct 24, 2006

11/586468

George J. Caporaso - Livermore CA, US
Stephen E. Sampayan - Manteca CA, US
James S. Sullivan - Livermore CA, US
David M. Sanders - Livermore CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H01L 23/48
H01L 23/52
H01L 29/40

257778, 257 82, 257433

An improved photoconductive switch having a SiC or other wide band gap substrate material, such as GaAs and field-grading liners composed of preferably SiN formed on the substrate adjacent the electrode perimeters or adjacent the substrate perimeters for grading the electric fields.

7924121, Apr 12, 2011

Jun 23, 2008

12/144274

George J. Caporaso - Livermore CA, US
Scott D. Nelson - Patterson CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H01P 3/10
H05H 9/00

333236, 333 34, 315500

A dispersion-free radial transmission line (“DFRTL”) preferably for linear accelerators, having two plane conductors each with a central hole, and an electromagnetically permeable material (“EPM”) between the two conductors and surrounding a channel connecting the two holes. At least one of the material parameters of relative magnetic permeability, relative dielectric permittivity, and axial width of the EPM is varied as a function of radius, so that the characteristic impedance of the DFRTL is held substantially constant, and pulse transmission therethrough is substantially dispersion-free. Preferably, the EPM is divided into concentric radial sections, with the varied material parameters held constant in each respective section but stepwise varied between sections as a step function of the radius. The radial widths of the concentric sections are selected so that pulse traversal time across each section is the same, and the varied material parameters of the concentric sections are selected to minimize traversal error.

8125089, Feb 28, 2012

Nov 23, 2010

12/952949

George J. Caporaso - Livermore CA, US
Stephen E. Sampayan - Manteca CA, US
James S. Sullivan - Livermore CA, US
David M. Sanders - Livermore CA, US

Lawrence Livermore National Security, LLC - Livermore CA

H01L 23/48
H01L 23/52
H01L 29/40

257778, 257 82, 257433

An improved photoconductive switch having a SIC or other wide band gap substrate material, such as GaAs and field-grading liners composed of preferably SiN formed on the substrate adjacent the electrode perimeters or adjacent the substrate perimeters for grading the electric fields.

8563930, Oct 22, 2013

Apr 17, 2009

12/426143

John Richardson Harris - Patterson CA, US
George J. Caporaso - Livermore CA, US
Stephen E. Sampayan - Manteca CA, US

Lawrence Livermore National Security, LLC - Livermore CA

G01J 5/00
H01L 31/09
H01L 31/08

2503381, 250200, 338 15, 332149, 332150

A system and method for producing modulated electrical signals. The system uses a variable resistor having a photoconductive wide bandgap semiconductor material construction whose conduction response to changes in amplitude of incident radiation is substantially linear throughout a non-saturation region to enable operation in non-avalanche mode. The system also includes a modulated radiation source, such as a modulated laser, for producing amplitude-modulated radiation with which to direct upon the variable resistor and modulate its conduction response. A voltage source and an output port, are both operably connected to the variable resistor so that an electrical signal may be produced at the output port by way of the variable resistor, either generated by activation of the variable resistor or propagating through the variable resistor. In this manner, the electrical signal is modulated by the variable resistor so as to have a waveform substantially similar to the amplitude-modulated radiation.

8563957, Oct 22, 2013

May 6, 2010

12/775156

George J. Caporaso - Livermore CA, US

Lawrence Livermore National Security, LLC. - Livermore CA

H03K 17/78
H01L 23/48

250551, 250214 SW, 257431, 257773

A photoconductive switch is formed of a substrate that has a central portion of SiC or other photoconductive material and an outer portion of cvd-diamond or other suitable material surrounding the central portion. Conducting electrodes are formed on opposed sides of the substrate, with the electrodes extending beyond the central portion and the edges of the electrodes lying over the outer portion. Thus any high electric fields produced at the edges of the electrodes lie outside of and do not affect the central portion, which is the active switching element. Light is transmitted through the outer portion to the central portion to actuate the switch.