Mark A Rhodes

US Patent:

6605901, Aug 12, 2003

Filed:

Jan 3, 2002

Appl. No.:

10/038386

Inventors:

Mark A. Rhodes - Redwood City CA
Scott N. Fochs - Livermore CA

Assignee:

The United States of America as represented by the Department of Energy - Washington DC

International Classification:

H01J 724

US Classification:

31511171, 31511121, 315337, 3151691

Abstract:

An apparatus and method to contain plasma at optimal fill capacity of a metallic container is disclosed. The invention includes the utilization of anodized layers forming the internal surfaces of the container volume. Bias resistors are calibrated to provide constant current at variable voltage conditions. By choosing the appropriate values of the bias resistors, the voltages of the metallic container relative to the voltage of an anode are adjusted to achieve optimal plasma fill while minimizing the chance of reaching the breakdown voltage of the anodized layer.

US Patent:

6627461, Sep 30, 2003

Filed:

Apr 18, 2001

Appl. No.:

09/837898

Inventors:

Robert G. Chapman - Burlingame CA
John Hefti - San Francisco CA
Barrett J. Bartell - Pacifica CA
Mark A. Rhodes - Redwood City CA
Min Zhao - Foster City CA
Tyler Palmer - San Francisco CA

Assignee:

Signature Bioscience, Inc. - San Francisco CA

International Classification:

G01N 33536

US Classification:

436536, 422 8201, 435 4, 435 6, 435 71, 435 72, 435 792, 4352871, 4352872, 436149, 436150, 436151, 436517, 436518, 436524, 436805, 436806

Abstract:

The present invention provides a method for detecting a molecular event, comprising (1) applying an electromagnetic test signal to a sample in which a molecular event is being detected, whereby the sample interacts with and modulates the test signal to produce a modulated test signal, and (2) detecting the modulated test signal, wherein the applying and detecting take place in a temperature-controlled environment, wherein the temperature-controlled environment comprises the sample, a radiating portion of a signal generating circuit, and a receiving portion of a signal detection circuit and wherein the applying and detecting take place in the environment at a temperature controlled to within Â0. 5Â C.

US Patent:

7083985, Aug 1, 2006

Filed:

Aug 23, 2002

Appl. No.:

10/226794

Inventors:

John J. Hefti - San Francisco CA, US
Barrett Bartell - Pacifica CA, US
Kurt Kramer - Albany CA, US
Mark A. Rhodes - Redwood City CA, US

International Classification:

G01N 33/543

US Classification:

436518, 385 4, 385 8, 385 9, 385 12, 385129, 422 8201, 435 6, 435 71, 435 792, 4352871, 4352872, 436149, 436150, 436151, 436517, 436524, 436525, 436805, 436806

Abstract:

A coplanar waveguide biosensor and methods of use include a coplanar waveguide transmission line and a sample containment structure. The coplanar waveguide transmission line is operable to support the propagation of an electromagnetic signal and includes a signal line and one or more spaced apart ground elements. The signal line is configured to conduct a time-varying voltage, and the one or more ground elements are configured to maintain a time-invariant voltage, a detection region being formed between a portion of the signal line and a portion of at least one of the one or more ground elements. Detection methods are improved through the enhancement of the electric field in the detection region via impedance discontinuities in the signal line and ground elements. The sample containment structure intersects the detection region of the coplanar waveguide transmission line and includes a cavity configured to hold 1 ml or less of sample solution within the detection region.

US Patent:

7440568, Oct 21, 2008

Filed:

Jun 9, 2006

Appl. No.:

11/450429

Inventors:

Mark A. Rhodes - Pleasanton CA, US

Assignee:

Lawrence Livermore National Security, LLC - Livermore CA

International Classification:

H04M 1/00

US Classification:

37941304, 379414, 379398, 315505, 307106, 333 173, 333101, 331172

Abstract:

A bipolar pulse forming transmission line module for linear induction accelerators having first, second, third, fourth, and fifth planar conductors which form an interleaved stack with dielectric layers between the conductors. Each conductor has a first end, and a second end adjacent an acceleration axis. The first and second planar conductors are connected to each other at the second ends, the fourth and fifth planar conductors are connected to each other at the second ends, and the first and fifth planar conductors are connected to each other at the first ends via a shorting plate adjacent the first ends. The third planar conductor is electrically connectable to a high voltage source, and an internal switch functions to short a high voltage from the first end of the third planar conductor to the first end of the fourth planar conductor to produce a bipolar pulse at the acceleration axis with a zero net time integral. Improved access to the switch is enabled by an aperture through the shorting plate and the proximity of the aperture to the switch.

US Patent:

7949126, May 24, 2011

Filed:

Jun 17, 2008

Appl. No.:

12/140913

Inventors:

Mark A. Rhodes - Pleasanton CA, US

Assignee:

Lawrence Livermore National Security, LLC - Livermore CA

International Classification:

H04M 1/00

US Classification:

37941304, 379414, 379398, 315505, 331 99, 331172, 333 173, 333161

Abstract:

A bipolar pulse forming transmission line module and system for linear induction accelerators having first, second, third, and fourth planar conductors which form a sequentially arranged interleaved stack having opposing first and second ends, with dielectric layers between the conductors. The first and second planar conductors are connected to each other at the first end, and the first and fourth planar conductors are connected to each other at the second end via a shorting plate. The third planar conductor is electrically connectable to a high voltage source, and an internal switch functions to short at the first end a high voltage from the third planar conductor to the fourth planar conductor to produce a bipolar pulse at the acceleration axis with a zero net time integral. Improved access to the switch is enabled by an aperture through the shorting plate and the proximity of the aperture to the switch.

US Patent:

8514475, Aug 20, 2013

Filed:

Oct 27, 2010

Appl. No.:

12/913651

Inventors:

Robert J. Deri - Pleasanton CA, US
Mark A. Rhodes - Pleasanton CA, US
Andrew J. Bayramian - Manteca CA, US
John A. Caird - San Francisco CA, US
Mark A. Henesian - Livermore CA, US
Christopher A. Ebbers - Pleasanton CA, US

Assignee:

Lawrence Livermore National Security, LLC - Livermore CA

International Classification:

G02F 1/03

US Classification:

359254

Abstract:

An electro-optic device includes an electro-optic crystal having a predetermined thickness, a first face and a second face. The electro-optic device also includes a first electrode substrate disposed opposing the first face. The first electrode substrate includes a first substrate material having a first thickness and a first electrode coating coupled to the first substrate material. The electro-optic device further includes a second electrode substrate disposed opposing the second face. The second electrode substrate includes a second substrate material having a second thickness and a second electrode coating coupled to the second substrate material. The electro-optic device additionally includes a voltage source electrically coupled to the first electrode coating and the second electrode coating.

US Patent:

8608375, Dec 17, 2013

Filed:

Oct 15, 2010

Appl. No.:

12/905958

Inventors:

Mark Rhodes - Pleasanton CA, US

Assignee:

Lawrence Livermore National Security, LLC - Livermore CA

International Classification:

G01J 5/08
G01K 11/00
G01J 3/10

US Classification:

374161, 374130, 374121, 374141, 73 2501, 356301

Abstract:

A method of measuring a temperature of a noble gas in a chamber includes providing the noble gas in the chamber. The noble gas is characterized by a pressure and a temperature. The method also includes directing a first laser beam into the chamber and directing a second laser beam into the chamber. The first laser beam is characterized by a first frequency and the second laser beam is characterized by a second frequency. The method further includes converting at least a portion of the first laser beam and the second laser beam into a coherent anti-Stokes beam, measuring a Doppler broadening of the coherent anti-Stokes beam, and computing the temperature using the Doppler broadening.

US Patent:

54104254, Apr 25, 1995

Filed:

May 10, 1993

Appl. No.:

8/058844

Inventors:

Mark A. Rhodes - Pleasanton CA

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G02F 103

US Classification:

359254

Abstract:

Magnetron cathodes, which produce high current discharges, form greatly improved plasma electrodes on each side of an electro-optic crystal. The plasma electrode has a low pressure gas region on both sides of the crystal. When the gas is ionized, e. g. , by a glow discharge in the low pressure gas, the plasma formed is a good conductor. The gas electrode acts as a highly uniform conducting electrode. Since the plasma is transparent to a high energy laser beam passing through the crystal, the plasma is transparent. A crystal exposed from two sides to such a plasma can be charged up uniformly to any desired voltage. A typical configuration utilizes helium at 50 millitorr operating. pressure and 2 kA discharge current. The magnetron cathode produces a more uniform plasma and allows a reduced operating pressure which leads to lower plasma resistivity and a more uniform charge on the crystal.