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Use of molybdenum ion source electrodes at RTNS-II

Description: Reports are reported for an ongoing effort to optimize D+ beam production by the MATS-III ion source used at RTNS-II. The three seven-aperture electrodes, originally consisting of water-cooled copper, have now been tested using uncooled molybdenum and with water cooling on the second (decel) electrode only. Details of the change, the results of the testing, and the benefits in operation, performance and cost are given.
Date: September 29, 1986
Creator: Massoletti, D.J.; Harter, G.A. & Heikkinen, D.W.
Partner: UNT Libraries Government Documents Department
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Injection scenarios for TNS

Description: Neutral beam injection heating is the most technically advanced and experimentally proven form of auxiliary Tokamak heating. In TNS, due to its large size and density, the major problem is a lack of beam penetration. An attempt is made to determine the scope of the problem and outline possible strategies for dealing with it. Some of these strategies are: raise the injection energy, injection vertically into a locally produced minimum in the toroidal magnetic field so that the injected ions are … more
Date: January 1, 1977
Creator: Rome, J. A.; Peng, Y. K. M. & Davidson, J. N.
Partner: UNT Libraries Government Documents Department
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Analyzing-power formalism for three-body final states

Description: Various relations important for extraction of analyzing powers from data on reactions involving three particles in the final state were derived. Several of the results pertinent for spin-1/2 and spin-1 polarized beams are presented here. These may be used in analysis of the /sup 1/H(d-vector,pp)n reaction. 3 figures. (RWR)
Date: January 1, 1980
Creator: Ohlsen, G.G.; Brown, R.E.; Correll, F.D. & Hardekopf, R.A.
Partner: UNT Libraries Government Documents Department
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Comparison of methods for the production of neutral beams

Description: The fusion reactor neutral beam program consists principally of development and application of positive ion based systems in the energy range of less than or equal to 120 keV. Reactor studies for both mirrors and tokamaks, and even studies of tokamak research devices beyond TFTR, indicate a need for higher energies and also higher efficiencies than can be obtained by extrapolating positive ion based systems. The relative merits of systems based on positive ions, positive ions with energy recove… more
Date: December 1, 1977
Creator: Stewart, L. D.
Partner: UNT Libraries Government Documents Department
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Report of Working Group on Accelerator Problems

Description: There are many experimental elementary particle objectives which are uniquely achievable with polarized proton beams. These objectives require both higher beam energies and intensities than are presently available. The polarized ion source working group concluded that it looks quite practical to produce polarized H sources with output currents of several mA. The significance of this is best demonstrated by the fact that the ZGS operates at its space charge limit using a 6 mA H/sup -/ impolarize… more
Date: October 18, 1977
Creator: Cho, Y.; Montague, B. W.; Kubischta, W.; Turrin, A.; Courant, E. D. & Ratner, L.
Partner: UNT Libraries Government Documents Department
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Negative beam generation, transport, and acceleration

Description: A negative ion beam, generated by double charge exchange, has been accelerated to 60 keV. The components of the beamline are described, and an analysis of the flow and the effect of the beam-generated plasma is presented. It is shown that plasma flow along the beamline is limited by transverse ambipolar transport; acceleration of electrons can therefore be minimized by employing a drift space to control the flow of electrons from the cesium cell to the accelerator entrance.
Date: October 1, 1977
Creator: Poulsen, P.; Anderson, O. A.; Hooper, E. B. Jr.; Orzechowski, T. J. & Turnbull, R. J.
Partner: UNT Libraries Government Documents Department
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Accelerator-based intense neutron source for materials R D

Description: Accelerator-based neutron sources for R D of materials in nuclear energy systems, including fusion reactors, can provide sufficient neutron flux, flux-volume, fluence and other attractive features for many aspects of materials research. The neutron spectrum produced from the D-Li reaction has been judged useful for many basic materials research problems, and to be a satisfactory approximation to that of the fusion process. The technology of high-intensity linear accelerators can readily be appl… more
Date: January 1, 1990
Creator: Jameson, Robert A.
Partner: UNT Libraries Government Documents Department
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Neutron environment in the fusion materials irradiaton test facility

Description: The methodology used to generate a neutron flux map is described in considerable detail. Representative spectra are displayed for the test module. The implications of the variations of damage parameters within this FMIT module have been considered previously. (MOW)
Date: July 1, 1979
Creator: Carter, L. L.
Partner: UNT Libraries Government Documents Department
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Neutron production in a high-intensity deuterium neutral beam facility

Description: Measurement of d-d neutron yields incidentally produced in multi-megawatt neutral deuterium beam injectors used in magnetic fusion experiments is discussed. Unavoidable neutron production in the neutralizer, ion-beam dump, neutral beam calorimeter and beam collimator sections of an injector is measured to provide data for the design of radiation shielding and beam diagnostic experiments. At 120 kV, 10A, 0.5s pulsed injector operation, neutron yields plateau at an instantaneous yield from the ca… more
Date: June 1, 1977
Creator: Berkner, K. H.; Cooper, W. S.; McCaslin, J. B. & Pyle, R. V.
Partner: UNT Libraries Government Documents Department
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High-intensity polarized H-(proton), deuteron and 3He++ion source development at BNL.

Description: New techniques for the production of polarized electron, H{sup -} (proton), D (D+) and {sup 3}H{sup ++} ion beams are discussed. Feasibility studies of these techniques are in progress at BNL. An Optically Pumped Polarized H{sup -} Ion Source (OPPIS) delivers beam for polarization studies in RHIC. The polarized deuteron beam will be required for the deuteron Electron Dipole Moment (EDM) experiment, and the {sup 3}H{sup ++} ion beam is a part of the experimental program for the future eRHIC (Ele… more
Date: June 23, 2008
Creator: Zelenski,A.
Partner: UNT Libraries Government Documents Department
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Analysis of intensity instability threshold at transition in RHIC.

Description: The beam intensity of ion beams in RHIC is limited by a fast transverse instability at transition, driven by the machine impedance and electron clouds. For gold and deuteron beams we analyze the dependence of the instability threshold on beam and machine parameters from recent operational data and dedicated experiments. We fit the machine impedance to the experimental data.
Date: June 23, 2008
Creator: Fischer, W.; Blaskiewicz, M.; Cameron, P.; Montag, C. & Ptitsyn, V.
Partner: UNT Libraries Government Documents Department
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A Sealed-Accelerator-Tube Neutron Generator for Boron Neutron Capture Therapy Application

Description: Radio-frequency (RF) driven ion sources are being developed in Lawrence Berkeley National Laboratory (LBNL) for sealed-accelerator-tube neutron generator applications. By using a 2.5-cm-diameter RF-driven multicusp source and a computer designed 100 keV accelerator column, peak extractable hydrogen current exceeding 1 A from a 3-mm-diameter aperture, together with H{sup +} yields over 94% have been achieved. These experimental findings together with recent moderator design will enable one to de… more
Date: June 1, 1998
Creator: Leung, K. N.; Leung, K. N.; Lee, Y.; Verbeke, J. M.; Vurjic, J.; Williams, M. D. et al.
Partner: UNT Libraries Government Documents Department
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Accelerator-Driven Neutron Source for Cargo Screening

Description: Advanced neutron interrogation systems for the screening ofsea-land cargo containers for shielded special nuclear materials (SNM)require a high-yield neutron source to achieve the desired detectionprobability, false alarm rate, and throughput. An accelerator-drivenneutron source is described that produces a forward directed beam ofhigh-energy (up to 8.5 MeV) neutrons utilizing the D(d,n)3He reaction atdeuteron beam energies of up to 6 MeV. The key components of the neutronsource are a high-curr… more
Date: November 15, 2006
Creator: Ludewigt, B. A.; Bleuel, D. L.; Hoff, M. D.; Kwan, J. W.; Li, D.; Ratti, A. et al.
Partner: UNT Libraries Government Documents Department
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Mechanical Design and Analysis of a 200 MHz, Bolt-together RFQ forthe Accelerator Driven Neutron Source

Description: A high-yield neutron source to screen sea-land cargocontainers for shielded Special Nuclear Materials (SNM) has been designedat LBNL [1,2]. The Accelerator-Driven Neutron Source (ADNS) uses theD(d,n)3He reaction to create a forward directed neutron beam. Keycomponents are a high-current radio-frequency quadrupole (RFQ)accelerator and a high-power target capable of producing a neutron fluxof>107 n/(cm2 cdot s) at a distance of 2.5 m. The mechanical designand analysis of the four-module, bolt-tog… more
Date: June 20, 2007
Creator: Virostek, Steve; Hoff, Matt; Li, Derun; Staples, John & Wells,Russell
Partner: UNT Libraries Government Documents Department
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Design of the accelerating structures for FMIT

Description: Design considerations and concepts are presented for the accelerating structures for the Fusion Materials Irradiation Test (FMIT) Facility. These structures consist of three major units: 0.1- to 2-MeV radio-frequency quadrupole based on the Russian concept, a 2- to 35-MeV drift-tube linac made up of two separate tanks designed to generate either 20- or 35-MeV beams, and an energy dispersion cavity capable of spreading the energy of the beam slightly to ease thermal loading in the target. Becaus… more
Date: January 1, 1979
Creator: Liska, D.; Schamaun, R.; Potter, C.; Fuller, C.; Clark, D.; Greenwood, D. et al.
Partner: UNT Libraries Government Documents Department
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FMIT accelerator vacuum system

Description: The Fusion Materials Irradiation Test (FMIT) Facility accelerator is being designed to continuously accelerate 100-mA deuterons to 25 MeV. High vacuum pumping of the accelerator structure and beam lines will be done by ion pumps and titanium sublimation pumps. The design of the roughing system includes a Roots blower/mechanical pump package. For economy the size of the system has been designed to operate at 10/sup -6/ torr, where beam particle scattering on residual gases is negligible. For min… more
Date: January 1, 1979
Creator: Machalek, M. D.; Meyer, E. A. & Price, L. S.
Partner: UNT Libraries Government Documents Department
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Photodetachment now

Description: To illustrate the feasibility of photodetachment, the author describes a conceptual design of photo-neutralizers for 0.5 and 3.0 MeV deuterium beams. The negative ions are stripped in optical cavities using large mirrors with higher than 99.99% reflectivity. The neutralizers are illuminated by an array of Nd:YAG slab-lasers emitting about 30 kW/m of light per unit length, while the mirrors are exposed to an irradiance of the order of 100 MW/m/sup 2/. Details of the photodetachment cells and the… more
Date: October 1, 1987
Creator: Fink, J.H.
Partner: UNT Libraries Government Documents Department
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High energy polarized deuterons at the Argonne National Laboratory zero gradient synchrotron

Description: Modifications made on the ZGS to allow the acceleration of polarized deuterons and the operational experiences with the first production run with this beam are described.
Date: January 1, 1979
Creator: Parker, E. F.; Brandeberry, F. E.; Crosbie, E. A.; Knott, M. J.; Potts, C. W.; Ratner, L. C. et al.
Partner: UNT Libraries Government Documents Department
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Dosimetry program for characterization of the FMIT facility

Description: The environmental characterization program for the Fusion Materials Irradiaton Test (FMIT) facility is presented. Requirements for the development and testing of Magnetic Fusion Energy (MFE) materials together with the complexity of the FMIT (d,Li) generated radiation field warrant a multifaceted dosimetric approach. Specific passive, active and calculational dosimetry efforts comprising this multifaceted approach are described. Special emphasis is given to those dosimetry capabilities uniquely… more
Date: January 1, 1979
Creator: Gold, R.; McElroy, W. N.; Fuller, J. L.; Sheen, E. M. & Dierckx, R.
Partner: UNT Libraries Government Documents Department
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Choice of geometry for the Alvarez section of the FMIT deuteron linac

Description: The Hanford Fusion Materials Irradiation Test (FMIT) 35-MeV linac is intended to produce neutrons for materials studies. Its operation will be virtually continuous for at least 20 years. Such operation implies that the accelerator design must be conservative to avoid excessive downtime and that the accelerator be economical of power. The initial design of the linac drift-tube section was preceded by more than 800 SUPERFISH computer runs. SUPERFISH allows the selection of a geometry for the FMIT… more
Date: January 1, 1979
Creator: Boicourt, G.P. & Swenson, D.A.
Partner: UNT Libraries Government Documents Department
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RTNS-II neutron sources: status report

Description: Experience with neutron sources consisting of air-insulated 400 kV deuteron accelerators and tritium targets which rotate at 5000 rpm is reported. These accelerators are part of the Rotating Target Neutron Source-II (RTNS-II) facility. A review of the accelerator design is given. Operation of the prototype accelerator using hydrogen beams is discussed in detail. The parameters are tabulated for the first accelerator operated as a neutron source in November, 1978. Additional terminal pumping has… more
Date: March 1, 1979
Creator: Davis, J. C.; Heikkinen, D. W.; Held, J. L.; Logan, C. M. & Osher, J. E.
Partner: UNT Libraries Government Documents Department
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High-intensity deuteron linear accelerator (FMIT)

Description: For fusion reactors to become operational, one of the many problems to be solved is to find materials able to withstand the intense bombardment of 14-MeV neutrons released by the fusion process. The development of alloys less likely to become damaged by this neutron bombardment will require years of work, making it desirable to begin studies in parallel with other aspects of fusion power generators. The Fusion Materials Irradiation Test (FMIT) Facility, to be built at the Hanford Engineering De… more
Date: January 1, 1979
Creator: Jameson, Robert A.
Partner: UNT Libraries Government Documents Department
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R-matrix analyses of light-element reactions for fusion applications

Description: Comprehensive R-matrix analyses of reactions in light systems done at LASL contain cross-section information of interest in fusion applications. Results for analyses of the 4-, 5-, 6-, and 7-nucleon systems are presented, with particular emphasis on cross sections for the T(d,n), D(d,n) D(d,p), T(p,2n), and /sup 6/Li(p,/sup 3/He) fusion reactions.
Date: January 1, 1979
Creator: Hale, G.M. & Dodder, D.C.
Partner: UNT Libraries Government Documents Department
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C-w operation of a 2-MeV RFQ accelerator

Description: We have achieved reliable cw operation of the Fusion Materials Irradiation Test (FMIT) radio-frequency quadrupole (RFQ) accelerator and have accelerated 40 mA of H/sub 2//sup +/ beam to an energy of 2 MeV. The technical considerations for future cw accelerator designs, based on our experience in achieving cw operation, will be presented. Also to be discussed are measurements of beam emittance, matching into the RFQ, and beam transmission through the accelerator. These measurements will be compa… more
Date: January 1, 1986
Creator: Cornelius, W.D.
Partner: UNT Libraries Government Documents Department
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