نتایج جستجو برای: ion source
تعداد نتایج: 614261 فیلتر نتایج به سال:
An ion source which utilizes a beam of monoenergetic electrons as the ionizing agent was designed and built for use in a 60° sector general utility mass spectrometer. The source was made to be used without a magnetic field to collimate the electron beam. The source is interchangeable with a surface ionization source that was already utilized in the mass spectrometer. Various operating character...
Ion Assisted Deposition (IAD) has become well established as a means of improving optical coating performance and reducing cost. Some performance improvements include durability, stability with humidity and temperature, and better stoichiometry. Cost reductions result from low temperature deposition and increased rates for reactive processes. The rate at which a deposition can occur with IAD is...
There are regimes of plasma source operation in which the ion motion is controlled by the ambipolar electric eld and ion-atom collisions. This paper presents a derivation of the corresponding ion distribution function and plasma density pro les in the source for a given electron temperature and a given gas ionization rate. Conditions are discussed under which the ion ux is predominantly radial ...
VENUS (Versatile ECR ion source for NUclear Science) is a next generation superconducting ECR ion source, designed to produce high current, high charge state ions for the 88-Inch Cyclotron at the Lawrence Berkeley National Laboratory. VENUS also serves as the prototype ion source for the RIA (Rare Isotope Accelerator) front end. The magnetic confinement configuration consists of three supercond...
We investigated the pressure dependence of gas flow and field ion intensity a coaxial source operating at room temperature over wide range, testing various gases ionisation voltages. Flow conductance measurements taking into account different gases' viscosity molecular mass consistently exhibit generic pattern. Three regimes appear with increasing upstream pressure. Since supplies locally, very...
We describe a source capable of producing single barium ions through nuclear recoils in radioactive decay. The source is fabricated by electroplating (148)Gd onto a silicon α-particle detector and vapor depositing a layer of BaF(2) over it. (144)Sm recoils from the alpha decay of (148)Gd are used to dislodge Ba(+) ions from the BaF(2) layer and emit them in the surrounding environment. The simu...
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