Robert Kowalczyk

Jet Propulsion Laboratory

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R. J. Holt

Argonne National Laboratory

R. Gilman

Rutgers, The State University of New Jersey

D. H. Potterveld

Argonne National Laboratory

E. Kinney

University of Colorado Boulder

Linda Young

Argonne National Laboratory

D. K. Toporkov

Budker Institute of Nuclear Physics

K. P. Coulter

University of Ontario Institute of Technology

Catherine Jones

University of Strathclyde

D. M. Nikolenko

Budker Institute of Nuclear Physics

J. A. Fedchak

University of Wisconsin–Madison

Cooperative Institutions

Argonne National Laboratory

137

Ross School

University of Alberta

California Institute of Technology

Massachusetts Institute of Technology

Thomas Jefferson National Accelerator Facility

Jet Propulsion Laboratory

Hermes Arzneimittel (Germany)

Health and Education Research Management and Epidemiologic Services (United States)

Istituto Nazionale di Fisica Nucleare

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High-density production of spin-polarized atomic hydrogen and deuterium

Physical Review A (1994)

Matt Poelker K. P. Coulter R. J. Holt Catherine Jones Robert Kowalczyk

The electron polarization of hydrogen (H) and deuterium (D) atoms in a spin-exchange optical-pumping apparatus has been measured as a function of H (D) density and magnetic-field strength. The atomic density was varied between 4\ifmmode\times\else\texttimes\fi{}${10}^{13}$ and 2.6\ifmmode\times\else\texttimes\fi{}${10}^{14}$ atoms/${\mathrm{cm}}^{3}$ and the magnetic-field strength from 120 to 400 mT. The results suggest that the atoms approach spin-temperature equilibrium even though the magnetic fields are large compared to the critical fields of the atoms.

10.1103/physreva.50.2450

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Citations (19)

Direct measurement of nuclear polarization in a laser driven polarized deuterium internal target

Bulletin of the American Physical Society (1995)

C.E. Jones J. A. Fedchak Robert Kowalczyk

Driven by the desire to study the spin properties of the deuteron and of the nucleons and quarks, a significant effort has been made to develop optically-pumped polarized hydrogen and deuterium internal targets with a combination of polarization and density that gives a higher figure-of-merit for scattering experiments than targets using more conventional polarization techniques. In order to be used for studies of the nucleus and its constituents these targets must provide polarized nuclei. It was generally considered necessary to explicitly induce RF transitions in order to obtain nuclear polarization from the laser-driven source because it operates in a high B field. However, it was realized recently that even in the presence of high-magnetic fields, collisions in a sufficiently dense sample of polarized hydrogen or deuterium atoms would drive the ensemble to a spin temperature distribution, where the net polarization is shared between the atomic electrons and the nuclei. Here we report direct measurements of the nuclear polarization of deuterium induced by these collisions and study the approach to spin temperature equilibrium of a deuterium internal target as a function of magnetic field and density.

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Development of a polarized deuterium target by spin exchange with optically pumped K

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (1987)

Linda Young R. J. Holt M.C. Green Robert Kowalczyk

Optical Pumping

10.1016/s0168-583x(87)80289-6

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Measurement of pzz of the laser-driven polarized deuterium target

AIP conference proceedings (1993)

Catherine Jones K. P. Coulter R. J. Holt Matt Poelker D. H. Potterveld

The question of whether nuclei are polarized as a result of H–H(D–D) spin‐exchange collisions within the relatively dense gas of a laser‐driven source of polarized hydrogen (deuterium) can be addressed directly by measuring the nuclear polarization of atoms from the source. The feasibility of using a polarimeter based on the D+T→n+4He reaction to measure the tensor polarization of deuterium in an internal target fed by the laser‐driven source has been tested. The device and the measurements necessary to test the spin‐exchange polarization theory are described.

10.1063/1.45155

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Carbon Nanotube Array Dynamics In Immersion And Drying

APS Division of Fluid Dynamics Meeting Abstracts (2002)

Elijah Sansom Flavio Noca Fei Chen Morteza Gharib Michael E. Hoenk

Immersion

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Fiber optic applications for laser polarized targets

AIP conference proceedings (1998)

W. J. Cummings Robert Kowalczyk

For the past two years, the laser polarized target group at Argonne has been using multi-mode fiber optic patch cords for a variety of applications. In this paper, we describe our design for transporting high power laser beams with optical fibers currently in use at IUCF.

10.1063/1.54993

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Analiza sił skrawania podczas toczenia węglików spiekanych WC-Co narzędziami z PCD

Inżynieria Maszyn (2013)

Robert Kowalczyk Wojciech Zębala

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Prospect for observation of polarization in electron-deuteron elastic scattering at high momentum transfer

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (1985)

R. J. Holt M C Green L. Young Robert Kowalczyk D. F. Geesaman

Momentum transfer

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Measurement of tensor analyzing power in elastic electron-deuteron scattering at momentum transfer range 2.8 – 4.6fm−1

Nuclear Physics A (2003)

D. M. Nikolenko H. Arenhövel Л.М. Барков S.L. Belostotsky В. Ф. Дмитриев

Momentum transfer

Electron scattering

Momentum (technical analysis)

10.1016/s0375-9474(03)01084-4

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[Treatment of cranial fractures, evaluation of osteosynthesis plates, complications and results].

The Polish otolaryngology (2005)

Mieczysław Sulikowski Robert Kowalczyk Piotr Zawodny

In recent years, the osteosynthesis plate has became very popular due to its quality during treatment of visceral cranium bone fractures. It is recommended to be used for stabile fusion of multi segment fractures. In the Maxillo-Facial Surgery Clinic of PMA Szczecin the presented method is applied from the mid-80-ies of the last century. Experience and obtained results permit as to state that osteosynthesis plate of visceral cranium posttraumatic fractures provides most efficient method in their treatment. It allows to establish one-time anatomical functional bone fusion, soon return to correct stomatognathic system, shortens hospitalizations time, thus securing speedy return to normal life. Analyzing the complications it was found out that in the majority of cases the decisive significance referred to: the condition of patients, time of reporting after trauma, biomechanical fusion features as wall as skill of the operator. Not always the complications were the results of the applied method.

Osteosynthesis

Cranial bone

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