Patents by Inventor Chiping Chen
Chiping Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20110121194Abstract: A charged-particle beam control system includes a plurality of external magnets that generate an axially-varying longitudinal magnetic (AVLM)/axially-varying quadrupole magnetic (AVQM) field. A plurality of external electrode geometries generates an axially-varying longitudinal electrostatic (AVLE)/axially-varying quadrupole electrostatic (AVQE) field. The external electrode geometries and magnets control and confine a charged-particle beam of elliptic cross-section.Type: ApplicationFiled: October 16, 2007Publication date: May 26, 2011Inventors: Ronak J. Bhatt, Chiping Chen, Jing Zhou
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Patent number: 7663327Abstract: A permanent magnet focusing system includes an electron gun that provides an electron ribbon beam having an elliptical shape. A plurality of permanent magnets provide transport for the electron ribbon beam. The permanent magnets produce a non-axisymmetric periodic permanent magnet (PPM) focusing field to allow the electron ribbon beam to be transported in the permanent magnet focusing system.Type: GrantFiled: May 15, 2006Date of Patent: February 16, 2010Assignee: Massachusetts Institute of TechnologyInventors: Ronak J. Bhatt, Chiping Chen, Jing Zhou, Alexey Radovinsky
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Patent number: 7619224Abstract: A high-brightness, space-charge-dominated circular charged-particle beam system includes a flat circular emitter that emits charge particles to form a space-charge-dominated circular charged-particle beam. The space-charge-dominated circular charged-particle beam is emitted from the flat circular emitter with a uniform density and having a current emission being space-charge-limited, obeying the Child-Langmuir law. A diode includes at least one electrode at the flat circular emitter and at least one additional electrode that accelerates the charged particles. A beam tunnel is coupled electrically to at least one of the additional electrodes. An applied axisymmetric magnetic field focuses the space-charge-dominated circular charged-particle beam. A depressed collector collects the space-charge-dominated circular charged-particle beam.Type: GrantFiled: November 15, 2007Date of Patent: November 17, 2009Assignee: Massachusetts Institute of TechnologyInventors: Chiping Chen, Thomas M. Bemis, Ronak J. Bhatt, Jing Zhou
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Patent number: 7612346Abstract: The charged-particle beam system includes a non-axisymmetric diode forms a non-axisymmetric beam having an elliptic cross-section. A focusing element utilizes a magnetic field for focusing and transporting the non-axisymmetric beam, wherein the non-axisymmetric beam is approximately matched with the channel of the focusing element.Type: GrantFiled: January 3, 2008Date of Patent: November 3, 2009Assignee: Massachusetts Institute of TechnologyInventors: Ronak J. Bhatt, Chiping Chen, Jing Zhou
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Patent number: 7538608Abstract: A RF amplifier includes a RF input section for receiving a RF input signal. At least one single-sided slow-wave structure is associated with the RF interaction section. An electron ribbon beam that interacts with the RF input supported by the at least one single-sided slow-wave structure so that the kinetic energy of the electron beam is transferred to the RF fields of the RF input signal, thus amplifying the RF input signal. A RF output section outputs the amplified RF input signal.Type: GrantFiled: June 17, 2004Date of Patent: May 26, 2009Assignee: Massachusetts Institute of TechnologyInventors: Chiping Chen, Bao-Liang Qian, Richard J. Temkin
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Publication number: 20080191144Abstract: The charged-particle beam system includes a non-axisymmetric diode forms a non-axisymmetric beam having an elliptic cross-section. A focusing element utilizes a magnetic field for focusing and transporting the non-axisymmetric beam, wherein the non-axisymmetric beam is approximately matched with the channel of the focusing element.Type: ApplicationFiled: January 3, 2008Publication date: August 14, 2008Inventors: Ronak J. Bhatt, Chiping Chen, Jing Zhou
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Publication number: 20080173827Abstract: A high-brightness, space-charge-dominated circular charged-particle beam system includes a flat circular emitter that emits charge particles to form a space-charge-dominated circular charged-particle beam. The space-charge-dominated circular charged-particle beam is emitted from the flat circular emitter with a uniform density and having a current emission being space-charge-limited, obeying the Child-Langmuir law. A diode includes at least one electrode at the flat circular emitter and at least one additional electrode that accelerates the charged particles. A beam tunnel is coupled electrically to at least one of the additional electrodes. An applied axisymmetric magnetic field focuses the space-charge-dominated circular charged-particle beam. A depressed collector collects the space-charge-dominated circular charged-particle beam.Type: ApplicationFiled: November 15, 2007Publication date: July 24, 2008Inventors: Chiping Chen, Thomas M. Bemis, Ronak J. Bhatt, Jing Zhou
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Patent number: 7381967Abstract: The charged-particle beam system includes a non-axisymmetric diode forms a non-axisymmetric beam having an elliptic cross-section. A focusing element utilizes a magnetic field for focusing and transporting the non-axisymmetric beam, wherein the non-axisymmetric beam is approximately matched with the channel of the focusing element.Type: GrantFiled: June 6, 2005Date of Patent: June 3, 2008Assignee: Massachusetts Institute of TechnologyInventors: Ronak J. Bhatt, Chiping Chen, Jing Zhou
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Publication number: 20060290452Abstract: A permanent magnet focusing system includes an electron gun that provides an electron ribbon beam having an elliptical shape. A plurality of permanent magnets provide transport for the electron ribbon beam. The permanent magnets produce a non-axisymmetric periodic permanent magnet (PPM) focusing field to allow the electron ribbon beam to be transported in the permanent magnet focusing system.Type: ApplicationFiled: May 15, 2006Publication date: December 28, 2006Inventors: Ronak Bhatt, Chiping Chen, Jing Zhou, Alexey Radovinsky
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Patent number: 7117133Abstract: A system and method for designing photonic band gap structures. The system and method provide a user with the capability to produce a model of a two-dimensional array of conductors corresponding to a unit cell. The model involves a linear equation. Boundary conditions representative of conditions at the boundary of the unit cell are applied to a solution of the Helmholtz equation defined for the unit cell. The linear equation can be approximated by a Hermitian matrix. An eigenvalue of the Helmholtz equation is calculated. One computation approach involves calculating finite differences. The model can include a symmetry element, such as a center of inversion, a rotation axis, and a mirror plane. A graphical user interface is provided for the user's convenience. A display is provided to display to a user the calculated eigenvalue, corresponding to a photonic energy level in the Brilloin zone of the unit cell.Type: GrantFiled: June 14, 2002Date of Patent: October 3, 2006Assignee: Massachusetts Institute of TechnologyInventors: Chiping Chen, Michael A. Shapiro, Evgenya I. Smirnova, Richard J. Temkin, Jagadishwar R. Sirigiri
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Publication number: 20060017002Abstract: The charged-particle beam system includes a non-axisymmetric diode forms a non-axisymmetric beam having an elliptic cross-section. A focusing element utilizes a magnetic field for focusing and transporting the non-axisymmetric beam, wherein the non-axisymmetric beam is approximately matched with the channel of the focusing element.Type: ApplicationFiled: June 6, 2005Publication date: January 26, 2006Inventors: Ronak Bhatt, Chiping Chen, Jing Zhou
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Publication number: 20050062424Abstract: A RF amplifier includes a RF input section for receiving a RF input signal. At least one single-sided slow-wave structure is associated with the RF interaction section. An electron ribbon beam that interacts with the RF input supported by the at least one single-sided slow-wave structure so that the kinetic energy of the electron beam is transferred to the RF fields of the RF input signal, thus amplifying the RF input signal. A RF output section outputs the amplified RF input signal.Type: ApplicationFiled: June 17, 2004Publication date: March 24, 2005Inventors: Chiping Chen, Bao-Liang Qian, Richard Temkin
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Patent number: 6801107Abstract: A vacuum electron device with a photonic bandgap structure that provides the ability to tune the behavior of the device to a particular mode of a plurality of modes of propagation. The photonic bandgap structure comprises a plurality of members, at least one of which is movable, and at least one of which is temperature controlled. The photonic bandgap structure makes possible the selection of one mode of propagation without the necessity to build structures having dimensions comparable to the wavelength of the propagation mode.Type: GrantFiled: January 4, 2002Date of Patent: October 5, 2004Assignee: Massachusetts Institute of TechnologyInventors: Chiping Chen, Michael Shapiro, Jagadishwar Sirigiri, Richard J. Temkin
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Patent number: 6617775Abstract: Electrons are arranged so they circulate along a spiral path in a vacuum. The path has a hollow symmetrical shape which is defined by a surface of a toroid. The shape is controllable by a magnetic field and the electrons can be contained within the shape. A containing force can be created by external electromagnetic fields, ions within the vacuum, or by interactions between the orbiting electrons themselves. The contained electrons store energy for later retrieval.Type: GrantFiled: October 31, 2000Date of Patent: September 9, 2003Assignee: Electron Power Systems, Inc.Inventors: D. Clint Seward, III, Chiping Chen, Richard J. Temkin
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Patent number: 6603911Abstract: A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.Type: GrantFiled: August 1, 2002Date of Patent: August 5, 2003Assignee: Massachusetts Institute of TechnologyInventors: Yoel Fink, Shanhui Fan, Edwin Thomas, Chiping Chen, John Joannopoulos
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Publication number: 20030023417Abstract: A system and method for designing photonic band gap structures. The system and method provide a user with the capability to produce a model of a two-dimensional array of conductors corresponding to a unit cell. The model involves a linear equation. Boundary conditions representative of conditions at the boundary of the unit cell are applied to a solution of the Helmholtz equation defined for the unit cell. The linear equation can be approximated by a Hermitian matrix. An eigenvalue of the Helmholtz equation is calculated. One computation approach involves calculating finite differences. The model can include a symmetry element, such as a center of inversion, a rotation axis, and a mirror plane. A graphical user interface is provided for the user's convenience. A display is provided to display to a user the calculated eigenvalue, corresponding to a photonic energy level in the Brilloin zone of the unit cell.Type: ApplicationFiled: June 14, 2002Publication date: January 30, 2003Inventors: Chiping Chen, Michael A. Shapiro, Evgenya I. Smirnova, Richard J. Temkin, Jagadishwar R. Sirigiri
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Publication number: 20020190655Abstract: A vacuum electron device with a photonic bandgap structure that provides the ability to tune the behavior of the device to a particular mode of a plurality of modes of propagation. The photonic bandgap structure comprises a plurality of members, at least one of which is movable, and at least one of which is temperature controlled. The photonic bandgap structure makes possible the selection of one mode of propagation without the necessity to build structures having dimensions comparable to the wavelength of the propagation mode.Type: ApplicationFiled: January 4, 2002Publication date: December 19, 2002Inventors: Chiping Chen, Michael Shapiro, Jagadishwar Sirigiri, Richard J. Temkin
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Publication number: 20020191929Abstract: A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.Type: ApplicationFiled: August 1, 2002Publication date: December 19, 2002Applicant: Massachusetts Institute of Technology, a Massachusetts corporationInventors: Yoel Fink, Shanhui Fan, Edwin Thomas, Chiping Chen, John Joannopoulos
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Patent number: 6463200Abstract: A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.Type: GrantFiled: October 14, 1999Date of Patent: October 8, 2002Assignee: Massachusetts Institute of TechnologyInventors: Yoel Fink, Shanhui Fan, Edwin Thomas, Chiping Chen, John Joannopoulos
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Publication number: 20020025130Abstract: A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.Type: ApplicationFiled: October 14, 1999Publication date: February 28, 2002Inventors: YOEL FINK, SHANHUI FAN, JOHN D. JOANNOPOULOS, CHIPING CHEN, EDWIN L. THOMAS