David K Dahl

US Patent:

7038216, May 2, 2006

Filed:

Dec 23, 2004

Appl. No.:

11/021380

Inventors:

David A. Dahl - Idaho Falls ID, US
Jill R. Scott - Idaho Falls ID, US
Anthony D. Appelhans - Idaho Falls ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

H01J 27/00

US Classification:

250423R, 250281, 250282, 250288, 250292

Abstract:

Electrostatic shape-shifting ion optics includes an outer electrode that defines an interior region between first and second opposed open ends. A first inner electrode is positioned within the interior region of the outer electrode at about the first open end. A second inner electrode is positioned within the interior region of the outer electrode at about the second open end. A first end cap electrode is positioned at about a first open end of the first inner electrode so that the first end cap electrode substantially encloses the first open end of the first inner electrode. A second end cap electrode is positioned at about a second open end of the second inner electrode so that the second end cap electrode substantially encloses the second open end of the second inner electrode. A voltage source operatively connected to each of the electrodes applies voltage functions to each of the electrodes to produce an electric field within an interior space enclosed by the electrodes.

US Patent:

7259369, Aug 21, 2007

Filed:

Aug 22, 2005

Appl. No.:

11/209534

Inventors:

Jill R. Scott - Idaho Falls ID, US
David A. Dahl - Idaho Falls ID, US
Carla J. Miller - Idaho Falls ID, US
Paul L. Tremblay - Idaho Falls ID, US
Timothy R. McJunkin - Idaho Falls ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

H01J 49/40
H01J 49/28
H01J 49/00

US Classification:

250287, 250281, 250282, 250283, 250299, 3133591

Abstract:

Ion mobility spectrometer apparatus may include an ion interface that is operable to hold positive and negative ions and to simultaneously release positive and negative ions through respective positive and negative ion ports. A first drift chamber is operatively associated with the positive ion port of the ion interface and encloses an electric field therein. A first ion detector operatively associated with the first drift chamber detects positive ions from the first drift chamber. A second drift chamber is operatively associated with the negative ion port of the ion interface and encloses an electric field therein. A second ion detector operatively associated with the second drift chamber detects negative ions from said second drift chamber.

US Patent:

7518105, Apr 14, 2009

Filed:

Dec 14, 2006

Appl. No.:

11/610609

Inventors:

David A. Dahl - Idaho Falls ID, US
Jill R. Scott - Idaho Falls ID, US
Anthony D. Appelhans - Idaho Falls ID, US
Timothy R. McJunkin - Idaho Falls ID, US
John E. Olson - Rigby ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

H01J 49/40
H01J 49/00

US Classification:

250286, 250281, 250282, 250299

Abstract:

An ion mobility spectrometer may include a flow channel having an inlet end and an outlet end. A deflection electrode is positioned within the flow channel so that a non-linear electric field is created between at least a portion of the flow channel and at least a portion of the deflection electrode when an electrostatic potential is placed across the deflection electrode and the flow channel. The ion mobility spectrometer also includes means for producing ions at a position upstream from the leading edge of the deflection electrode, so that ions produced thereby are deflected by the deflection electrode into the non-linear electric field. A detector positioned within the flow channel for detects ions from the non-linear electric field.

US Patent:

7518106, Apr 14, 2009

Filed:

Dec 14, 2006

Appl. No.:

11/610633

Inventors:

David A. Dahl - Idaho Falls ID, US
Jill R. Scott - Idaho Falls ID, US
Anthony D. Appelhans - Idaho Falls ID, US
Timothy R. McJunkin - Idaho Falls ID, US
John E. Olson - Rigby ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

H01J 49/40
H01J 49/00

US Classification:

250286, 250281, 250282, 250299

Abstract:

An ion mobility spectrometer may include an inner electrode and an outer electrode arranged so that at least a portion of the outer electrode surrounds at least a portion of the inner electrode and defines a drift space therebetween. The inner and outer electrodes are electrically insulated from one another so that a non-linear electric field is created in the drift space when an electric potential is placed on the inner and outer electrodes. An ion source operatively associated with the ion mobility spectrometer releases ions to the drift space defined between the inner and outer electrodes. A detector operatively associated with at least a portion of the outer electrode detects ions from the drift space.

US Patent:

7777182, Aug 17, 2010

Filed:

Aug 2, 2007

Appl. No.:

11/833079

Inventors:

David A. Dahl - Idaho Falls ID, US
Jill R. Scott - Idaho Falls ID, US
Timothy R. McJunkin - Idaho Falls ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

B01D 59/44

US Classification:

250291, 250293, 250292, 250290, 250288, 250282

Abstract:

An ion cyclotron spectrometer may include a vacuum chamber that extends at least along a z-axis and means for producing a magnetic field within the vacuum chamber so that a magnetic field vector is generally parallel to the z-axis. The ion cyclotron spectrometer may also include means for producing a trapping electric field within the vacuum chamber that includes at least a first section that induces a first magnetron effect that increases a cyclotron frequency of an ion and at least a second section that induces a second magnetron effect that decreases the cyclotron frequency of an ion. The cyclotron frequency changes induced by the first and second magnetron effects substantially cancel one another so that an ion traversing the at least first and second sections will experience no net change in cyclotron frequency.

US Patent:

7858950, Dec 28, 2010

Filed:

May 29, 2007

Appl. No.:

11/754898

Inventors:

David A. Dahl - Idaho Falls ID, US
Anthony D. Appelhans - Idaho Falls ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

G21K 5/04
H01J 49/26

US Classification:

250396R, 250396 ML, 250281, 250282

Abstract:

An EDL includes a case surface and at least one electrode surface. The EDL is configured to receive through the EDL a plurality of ion beams, to generate an electrostatic field between the one electrode surface and either the case surface or another electrode surface, and to increase the separation between the beams using the field. Other than an optional mid-plane intended to contain trajectories of the beams, the electrode surface or surfaces do not exhibit a plane of symmetry through which any beam received through the EDL must pass. In addition or in the alternative, the one electrode surface and either the case surface or the other electrode surface have geometries configured to shape the field to exhibit a less abrupt entrance and/or exit field transition in comparison to another electrostatic field shaped by two nested, one-quarter section, right cylindrical electrode surfaces with a constant gap width.

US Patent:

8129678, Mar 6, 2012

Filed:

Jun 17, 2010

Appl. No.:

12/818051

Inventors:

David A. Dahl - Idaho Falls ID, US
Jill R. Scott - Idaho Falls ID, US
Timothy R. McJunkin - Idaho Falls ID, US

Assignee:

Battelle Energy Alliance, LLC - Idaho Falls ID

International Classification:

B01D 59/44

US Classification:

250291, 250290, 250292, 250294, 250298

Abstract:

An ion cyclotron spectrometer may include a vacuum chamber that extends at least along a z-axis and means for producing a magnetic field within the vacuum chamber so that a magnetic field vector is generally parallel to the z-axis. The ion cyclotron spectrometer may also include means for producing a trapping electric field within the vacuum chamber. The trapping electric field may comprise a field potential that, when taken in cross-section along the z-axis, includes at least one section that is concave down and at least one section that is concave up so that ions traversing the field potential experience a net magnetron effect on a cyclotron frequency of the ions that is substantially equal to zero. Other apparatuses and a method for performing ion cyclotron spectrometry are also disclosed herein.

US Patent:

49688880, Nov 6, 1990

Filed:

Jul 5, 1989

Appl. No.:

7/375442

Inventors:

Anthony D. Appelhans - Idaho Falls ID
David A. Dahl - Idaho Falls ID
James E. Delmore - Idaho Falls ID

Assignee:

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

International Classification:

G01N 2300

US Classification:

250306

Abstract:

An apparatus and method for alternating voltage and for varying the rate of extraction during the extraction of secondary particles, resulting in periods when either positive ions, or negative ions and electrons are extracted at varying rates. Using voltage with alternating charge during successive periods to extract particles from materials which accumulate charge opposite that being extracted causes accumulation of surface charge of opposite sign. Charge accumulation can then be adjusted to a ratio which maintains a balance of positive and negative charge emission, thus maintaining the charge neutrality of the sample.