Patent application number | Description | Published |
20080315801 | Dispersion-Free Radial Transmission Lines - A dispersion-free radial transmission line preferably for linear accelerators, having two plane conductors each with a central hole, and an electromagnetically permeable material between the two conductors and surrounding a central channel connecting the two central holes. At least one of the material parameters of relative magnetic permeability, relative dielectric permittivity, and axial width of the permeable material is varied as a function of radius, so that the characteristic impedance of the radial transmission line is held substantially constant, and pulse transmission through the radial transmission line is substantially dispersion-free. Preferably, the electromagnetically permeable material is divided into concentric radial sections, with the varied material parameters held constant in each respective section but stepwise varied from section to section 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 so that the traversal error is minimized. | 12-25-2008 |
20090261258 | SYSTEM AND METHOD OF MODULATING ELECTRICAL SIGNALS USING PHOTOCONDUCTIVE WIDE BANDGAP SEMICONDUCTORS AS VARIABLE RESISTORS - 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. | 10-22-2009 |
20100032580 | Compact Accelerator For Medical Therapy - 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. | 02-11-2010 |
20100060207 | COMPACT ACCELERATOR FOR MEDICAL THERAPY - 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. | 03-11-2010 |
20100282949 | PHOTOCONDUCTIVE SWITCH PACKAGE - 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. | 11-11-2010 |
20110101376 | Optically-Initiated Silicon Carbide High Voltage Switch - 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. | 05-05-2011 |
20110297841 | Generalized Focusing And Deflection Utilizing Deformed Conducting Electrodes - A charged particle focusing and deflection apparatus and system utilizing one or more (i.e. stacked) ring-shaped electrodes which are contorted or deformed to shape a multipole electric field and thereby effect multipole electric focusing and deflection. In particular the ring-shaped electrodes may be used in a high gradient insulator of a particle accelerator, such as a dielectric wall accelerator (DWA). | 12-08-2011 |
20130106316 | RESISTIVE FOIL EDGE GRADING FOR ACCELERATOR AND OTHER HIGH VOLTAGE STRUCTURES | 05-02-2013 |
20140038321 | PHOTOCONDUCTIVE SWITCH PACKAGE - 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. | 02-06-2014 |
20140265940 | DIAMAGNETIC COMPOSITE MATERIAL STRUCTURE FOR REDUCING UNDESIRED ELECTROMAGNETIC INTERFERENCE AND EDDY CURRENTS IN DIELECTRIC WALL ACCELERATORS AND OTHER DEVICES - The devices, systems and techniques disclosed here can be used to reduce undesired effects by magnetic field induced eddy currents based on a diamagnetic composite material structure including diamagnetic composite sheets that are separated from one another to provide a high impedance composite material structure. In some implementations, each diamagnetic composite sheet includes patterned conductor layers are separated by a dielectric material and each patterned conductor layer includes voids and conductor areas. The voids in the patterned conductor layers of each diamagnetic composite sheet are arranged to be displaced in position from one patterned conductor layer to an adjacent patterned conductor layer while conductor areas of the patterned conductor layers collectively form a contiguous conductor structure in each diamagnetic composite sheet to prevent penetration by a magnetic field. | 09-18-2014 |
20140284451 | REDUCING LOCALIZED HIGH ELECTRIC FIELDS IN PHOTOCONDUCTIVE WIDE BANDGAP SEMICONDUCTORS - Methods, systems, and devices are disclosed for implementing a high voltage variable resistor. In one aspect, an optical transconductance variable resistor includes a photoconductive wide bandgap semiconductor material (PWBSM) substrate, whose conduction response to changes in amplitude of incident radiation that is substantially linear throughout a non-saturation region thereof, whereby the material is operable in non-avalanche mode as a variable resistor, and first and second electrodes in contact with the material so that: a first triple junction boundary region is formed between the PWBSM substrate and the first electrode, and a second triple junction boundary region is formed between the PWBSM substrate and the second electrode, and the PWBSM substrate is located within an internal triple junction region formed between the first and second triple junction boundary regions. | 09-25-2014 |
20140363123 | HIGH VOLTAGE PHOTOCONDUCTIVE SWITCH PACKAGE - A photoconductive switch having a wide bandgap material substrate between opposing electrodes, and a doped dielectric filler that is in contact with both the electrodes and the substrate at the triple point. The dielectric filler material is doped with a conductive material to make it partially or completely conducting, to minimize the field enhancement near the triple point both when the substrate is not conducting in the “off” state and when the substrate is rendered conducting by radiation in the “on” state. | 12-11-2014 |