Positron lifetime spectrometer using a DC positron beam

Title: Positron lifetime spectrometer using a DC positron beam

Abstract

An entrance grid is positioned in the incident beam path of a DC beam positron lifetime spectrometer. The electrical potential difference between the sample and the entrance grid provides simultaneous acceleration of both the primary positrons and the secondary electrons. The result is a reduction in the time spread induced by the energy distribution of the secondary electrons. In addition, the sample, sample holder, entrance grid, and entrance face of the multichannel plate electron detector assembly are made parallel to each other, and are arranged at a tilt angle to the axis of the positron beam to effectively separate the path of the secondary electrons from the path of the incident positrons.

Inventors:: Xu, Jun; Moxom, Jeremy

Issue Date:: 2003-10-21

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1174542

Patent Number(s):: 6635871

Application Number:: 09/894,776

Assignee:: UT-Battelle, LLC (Oak Ridge, TN)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

Show more

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N23/22 - by measuring secondary emission from the material

Show less

DOE Contract Number:: AC05-00OR22725

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats


                    Xu, Jun, and Moxom, Jeremy. Positron lifetime spectrometer using a DC positron beam.  United States: N. p., 2003. 
        Web.

Copy to clipboard


                    Xu, Jun, & Moxom, Jeremy. Positron lifetime spectrometer using a DC positron beam.  United States.

Copy to clipboard


                    Xu, Jun, and Moxom, Jeremy. Tue .  
        "Positron lifetime spectrometer using a DC positron beam".  United States.  https://www.osti.gov/servlets/purl/1174542.

Copy to clipboard


                    
@article{osti_1174542,

  title        = {Positron lifetime spectrometer using a DC positron beam},

  author       = {Xu, Jun and Moxom, Jeremy},

  abstractNote = {An entrance grid is positioned in the incident beam path of a DC beam positron lifetime spectrometer. The electrical potential difference between the sample and the entrance grid provides simultaneous acceleration of both the primary positrons and the secondary electrons. The result is a reduction in the time spread induced by the energy distribution of the secondary electrons. In addition, the sample, sample holder, entrance grid, and entrance face of the multichannel plate electron detector assembly are made parallel to each other, and are arranged at a tilt angle to the axis of the positron beam to effectively separate the path of the secondary electrons from the path of the incident positrons.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2003},

  month        = {10}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

An intense pulsed positron beam
journal, December 1994

Suzuki, Ryoichi; Kobayashi, Yoshinori; Mikado, Tomohisa
Hyperfine Interactions, Vol. 84, Issue 1
https://doi.org/10.1007/BF02060682

Measurement of the Positron Surface-State Lifetime for Al
journal, March 1984

Lynn, K. G.; Frieze, W. E.; Schultz, Peter J.
Physical Review Letters, Vol. 52, Issue 13
https://doi.org/10.1103/PhysRevLett.52.1137

Similar Records in DOE Patents and OSTI.GOV collections:

High collection efficiency X-ray spectrometer system with integrated electron beam stop, electron detector and X-ray detector for use on electron-optical beam lines and microscopes

Patent Zaluzec, Nestor J.

An X-ray spectrometer systems and methods are provided for implementing signal detection for use on electron-optical beam lines and microscopes. The X-ray Spectrometer System (XSS) includes an X-ray detector (XD) measuring the X-ray signal and positioned proximate to a specimen. An environmental isolation window together with an electron beam stop is disposed between XD and the specimen. The environmental isolation window and the electron beam stop protect XD from electrons directly transmitted through the specimen. An electron detector is located between the electron beam stop and the specimen allowing the measurement of scattered electrons. The XD measures an X-ray signalmore » in the X-ray spectrometer system.« less
Full Text Available
Determination of interfacial states in solid heterostructures using a variable-energy positron beam

Patent Asoka kumar, Palakkal P. V. (Coram, NY); Lynn, Kelvin G [Center Moriches, NY]

A method and means is provided for characterizing interfacial electron states in solid heterostructures using a variable energy positron beam to probe the solid heterostructure. The method includes the steps of directing a positron beam having a selected energy level at a point on the solid heterostructure so that the positron beam penetrates into the solid heterostructure and causes positrons to collide with the electrons at an interface of the solid heterostructure. The number and energy of gamma rays emitted from the solid heterostructure as a result of the annihilation of positrons with electrons at the interface are detected. Themore »« less
Full Text Available
DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers

Patent Fan, Non Q [San Diego, CA]; Clarke, John [Berkeley, CA]

A spectrometer for measuring the nuclear quadrupole resonance spectra or the zero-field nuclear magnetic resonance spectra generated by a sample is disclosed. The spectrometer uses an amplifier having a dc SQUID operating in a flux-locked loop for generating an amplified output as a function of the intensity of the signal generated by the sample. The flux-locked loop circuit includes an integrator. The amplifier also includes means for preventing the integrator from being driven into saturation. As a result, the time for the flux-locked loop to recover from the excitation pulses generated by the spectrometer is reduced.
Full Text Available
Apparatus for GHz rate high duty cycle pulsing and manipulation of low and medium energy DC electron beams

Patent Baryshev, Sergey V.; Jing, Chunguang; Qiu, Jiaqi; ...

An ElectroMagnetic-Mechanical Pulser can generate electron pulses at rates up to 50 GHz, energies up to 1 MeV, duty cycles up to 10%, and pulse widths between 100 fs and 10 ps. A modulating Transverse Deflecting Cavity (“TDC”) imposes a transverse modulation on a continuous electron beam, which is then chopped into pulses by an adjustable Chopping Collimating Aperture. Pulse dispersion due to the modulating TDC is minimized by a suppressing section comprising a plurality of additional TDC's and/or magnetic quadrupoles. In embodiments the suppression section includes a magnetic quadrupole and a TDC followed by four additional magnetic quadrupoles. Themore »« less
Full Text Available
Mass spectrometer with electron source for reducing space charge effects in sample beam

Patent Houk, Robert S.; Praphairaksit, Narong

A mass spectrometer includes an ion source which generates a beam including positive ions, a sampling interface which extracts a portion of the beam from the ion source to form a sample beam that travels along a path and has an excess of positive ions over at least part of the path, thereby causing space charge effects to occur in the sample beam due to the excess of positive ions in the sample beam, an electron source which adds electrons to the sample beam to reduce space charge repulsion between the positive ions in the sample beam, thereby reducing themore »« less
Full Text Available

Similar Records

Title: Positron lifetime spectrometer using a DC positron beam

Abstract

Citation Formats

An intense pulsed positron beam journal, December 1994

Measurement of the Positron Surface-State Lifetime for Al journal, March 1984

An intense pulsed positron beam
journal, December 1994

Measurement of the Positron Surface-State Lifetime for Al
journal, March 1984