8 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Charge Exchange"  
Results: 1 - 8
open access

Neutral beamline with improved ion-energy recovery

Description: A neutral beamline employing direct energy recovery of unneutralized residual ions is provided which enhances the energy recovery of the full energy ion component of the beam exiting the neutralizer cell, and thus improves the overall neutral beamline efficiency. The unneutralized full energy ions exiting the neutralizer are deflected from the beam path and the electrons in the cell are blocked by a magnetic field applied transverse to the beam direction in the neutralizer exit region. The ions… more
Date: April 13, 1981
Creator: Kim, J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Negative ion yields from protons and hydrogen atoms backscattered from cesium-coated surfaces

Description: The formation of negative ions by hydrogen collisions on cesium-coated surfaces is discussed in the limiting cases where the resident cesium is either in the purely ionic state or in the purely atomic state. The survival fraction for negative ions moving away from a metal surface is calculated using a method employing complex eigenvalues. The fraction of surviving ions is found to be larger than calculated by previous workers. The secondary emission coefficient for negative ion production by in… more
Date: May 13, 1977
Creator: Hiskes, J. R. & Karo, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurements of the Total Charge-Changing Cross Sections for Collisions of Fast Ions with Target Gas Using High Current Experiment

Description: The sum of ionization and charge-exchange cross sections of several gas targets (H2, N2, He, Ne, Kr, Xe, Ar, and water vapor) impacted by 1MeV K+ beam are measured. In a high current ion beam, the self-electric field of the beam is high enough that ions produced from the gas ionization or charge exchange by the ion beam are quickly swept to the sides of accelerator. The flux of the expelled ions is measured by a retarding field analyzer. This allows accurate measuring of the total charge-changi… more
Date: April 13, 2009
Creator: Covo, Michel Kireeff; Molvik, Arthur W.; Kaganovich, Igor D.; Shnidman, Ariel & Vujic, Jasmina L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Cometary X-ray emission: theoretical cross sections following charge exchange by multiply charged ions of astrophysical interest

Description: The CTMC method is used to calculate emission cross sections following charge exchange collisions involving highly charged ions of astrophysical interest and typical cometary targets. Comparison is made to experimental data obtained on the EBIT machine at Lawrence Livermore National Laboratory (LLNL) for O{sup 8+} projectiles impinging on different targets at a collision energy of 10 eV/amu. The theoretical cross sections are used together with ion abundances measured by the Advanced Compositio… more
Date: February 13, 2007
Creator: Otranto, S; Olson, R E & Beiersdorfer, P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Solid State Neutral Particle Analyzer Array on NSTX

Description: A Solid State Neutral Particle Analyzer (SSNPA) array has been installed on the National Spherical Torus Experiment (NSTX). The array consists of four chords viewing through a common vacuum flange. The tangency radii of the viewing chords are 60, 90, 100, and 120 cm. They view across the three co-injection neutral beam lines (deuterium, 80 keV (typ.) with tangency radii 48.7, 59.2, and 69.4 cm) on NSTX and detect co-going energetic ions. A silicon photodiode used was calibrated by using a mono-… more
Date: May 13, 2004
Creator: Shinohara, K.; Darrow, D. S.; Roquemore, A. L.; Medley, S. S. & Cecil, F. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electron capture and loss cross sections and angular scattering of D/sup +/ /sup 0/ /sup -/ in Cs: formation of D/sup -/ beams for MFE experiments and reactors. Technical progress report No. 1, January 2-November 30, 1980

Description: This project is a combined experimental and modeling effort directed to problems in negative ion beam formation that are important in the design and development of high energy neutral injectors for the DOE fusion program. Specifically, the present program is concerned with the electron capture and loss mechanisms and the associated angular scattering effects that govern the production of D/sup -/ via double charge-transfer of D/sup +/ in alkali vapors at energies below 1 keV/amu. The overall ai… more
Date: January 13, 1981
Creator: Coggiola, M. J. & Peterson, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laboratory simulation of cometary x rays using a high-resolution microcalorimeter

Description: X-ray emission following charge exchange has been studied on the University of California Lawrence Livermore National Laboratory electron beam ion traps EBIT-I and EBIT-II using a high-resolution microcalorimeter. The measured spectra include the K-shell emission from hydrogen-like and helium-like C, N, O, and Ne needed for simulations of cometary x-ray emission. A comparison of the spectra produced in the interaction of O{sup 8+} with N{sub 2} and CH{sub 4} is presented that illustrates the de… more
Date: August 13, 2004
Creator: Beiersdorfer, P; Chen, H; Boyce, K R; Brown, G V; Kelley, R L; Kilbourne, C A et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Neutral beamline with improved ion-energy recovery

Description: A neutral beamline generator with unneutralized ion energy recovery is provided which enhances the energy recovery of the full energy ion component of the beam exiting the neutralizer cell of the beamline. The unneutralized full energy ions exiting the neutralizer are deflected from the beam path and the electrons in the cell are blocked by a magnetic field applied transverse to the beamline in the cell exit region. The ions, which are generated at essentially ground potential and accelerated t… more
Date: April 13, 1981
Creator: Dagenhart, William K.; Haselton, Halsey H.; Stirling, William L. & Whealton, John H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
Back to Top of Screen