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PLASMA WINDOW FOR VACUUM - ATMOSPHERE INTERFACE AND FOCUSING LENS OF SOURCES FOR NON-VACUUM MATERIAL MODIFICATION.

Description: Material modifications by ion implantation, dry etching, and micro-fabrication are widely used technologies, all of which are performed in vacuum, since ion beams at energies used in these applications are completely attenuated by foils or by long differentially pumped sections, which ate currently used to interface between vacuum and atmosphere. A novel plasma window, which utilizes a short arc for vacuum-atmosphere interface has been developed. This window provides for sufficient vacuum atmos… more
Date: September 7, 1997
Creator: Hershcovitch, A.
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Partner: UNT Libraries Government Documents Department
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A new 14 GHz Electron-Cyclotron-Resonance Ion Source (ECRIS) for the Heavy Ion Accelerator Facility ATLAS

Description: A new 14 GHz Electron-Cyclotron-Resonance Ion Source (ECRIS) has been designed and built over the last two years. The source, which is a modification of the AECR at Berkeley, incorporates the latest results from ECR developments to produce intense beams of highly charged ions, i.e. an improved magnetic confinement of the plasma electrons. The aluminum plasma chamber and extraction electrode as well as a biased disk on axis at the microwave injection side donate additional electrons to the plasm… more
Date: April 1, 1997
Creator: Schlapp, M.; Vondrasek, R. C.; Szczech, J.; Billquist, P. J.; Pardo, R. C.; Xie, Z. Q. et al.
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Partner: UNT Libraries Government Documents Department
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State of the Art ECR Ion Sources

Description: Electron Cyclotron Resonance (ECR) ion source which produces highly-charged ions is used in heavy ion accelerators worldwide. Applications also found in atomic physics research and industry ion implantation. ECR ion source performance continues to improve, especially in the last few years with new techniques, such as multiple-frequency plasma heating and better methods to provide extra cold electrons, combined with higher magnetic mirror fields. So far more than 1 emA of multiply-charged ions s… more
Date: May 1, 1997
Creator: Xie, Z.Q.
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Partner: UNT Libraries Government Documents Department
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Status report of a compact 10 GHz electron cyclotron resonance (ECR) ion source for atomic physics experiments

Description: A summary of recent modifications and developments of a compact, fully permanent magnet ECR ion source will be given in this paper. To improve the confinement of the plasma electrons the axial magnetic mirror ratio has been enhanced to 2.5. This results in a more efficient plasma heating at low microwave power levels and therefore ion currents up to 320 e{mu}A could be extracted with a microwave power of less than 10 Watts. The maximum intensities for different charge states and various gases o… more
Date: August 1, 1997
Creator: Trassl, R.; Broetz, F. & Pawlowsky, M.
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Partner: UNT Libraries Government Documents Department
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Development of a 130-mA, 75-kV high voltage column for high-intensity dc proton injectors

Description: A reliable high-voltage (HV) column has been developed for dc proton injectors with applications to high-intensity cw linacs. The HV column is coupled with a microwave-driven plasma generator to produce a 75-keV, 110-mA dc proton beam. Typical proton fraction from this source is 85--90%, requiring the HV column and accelerating electrodes to operate with a 130-mA hydrogen-ion beam current. A glow-discharge, which was caused by the ion source axial magnetic field, was initially observed in the H… more
Date: December 1, 1997
Creator: Sherman, J.; Arvin, A.; Hansborough, L.; Hodgkins, D.; Meyer, E.; Schneider, J. D. et al.
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Partner: UNT Libraries Government Documents Department
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A new 14 GH{sub z} electron-cyclotron-resonance ion source (ECRIS) for the heavy ion accelerator facility ATLAS

Description: A new 14 GHz ECRIS has been designed and built over the last two years. The source design incorporates the latest results from ECR developments to produce intense beams of highly charged ions. An improved magnetic electron confinement is achieved from a large mirror ratio and strong hexapole field. The aluminum plasma chamber and extraction electrode as well as a biased disk on axis at the microwave injection side donate additional electrons to the plasma, making use of the large secondary elec… more
Date: September 1, 1997
Creator: Schlapp, M.; Vondrasek, R.C.; Szczech, J.; Biliquist, P.J.; Pardo, R.C.; Xie, Z.Q. et al.
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Partner: UNT Libraries Government Documents Department
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Oak Ridge 24URC tandem accelerator

Description: This report discusses the operation of the Holifield Radioactive Ion Beam Facility (HRIBF) which was dedicated on December 12, 1996, with a formal ceremony followed by a reception and tour. This dedication marked the culmination of the reconfiguration, started in the middle of 1992, and the beginning of full-time operation as an international user facility. Although construction and commissioning are finished, development continues on ion sources and better methods to produce new and more inten… more
Date: November 1, 1997
Creator: Meigs, M. J.; Haynes, D. L. & Juras, R. C.
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Partner: UNT Libraries Government Documents Department
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Software architecture considerations for ion source control systems

Description: General characteristics of distributed control system software tools are examined from the perspective of ion source control system requirements. Emphasis is placed on strategies for building extensible, distributed systems in which the ion source element is one component of a larger system. Vsystem, a commercial software tool kit from Vista Control Systems was utilized extensively in the control system upgrade of the Holifield Radioactive Ion Beam Facility. Part of the control system is descri… more
Date: September 1, 1997
Creator: Sinclair, J.W.
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Partner: UNT Libraries Government Documents Department
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Overview of progress on the improvement projects for the LANSCE accelerator and target facilities

Description: Three projects have been initiated since 1994 to improve the performance of the accelerator and target facilities for the Los Alamos Neutron Science Center (LANSCE). The LANSCE Reliability Improvement Project (LRIP) was separated into two phases. Phase 1, completed in 1995, targeted near-term improvements to beam reliability and availability that could be completed in one-year`s time. Phase 2, now underway and scheduled for completion in May 1998, consists of two projects: (a) implementation of… more
Date: June 1, 1997
Creator: Macek, R. J.; Browne, J.; Brun, T.; Donahue, J. B.; Fitzgerald, D. H.; Hoffman, E. et al.
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Partner: UNT Libraries Government Documents Department
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Experimental results from the BNL TestEBIS

Description: At Brookhaven National Laboratory, an Electron Beam Ion Source (EBIS) is operational and has produced charge states such as N{sup 7+}, Ar{sup 16+}, and Xe{sup 26+} using neutral gas injection. Ions such as Na{sup 7+} and Tl{sup 41+} have been produced using external ion injection. The BNL EBIS effort is directed at reaching intensities of interest to RHIC, approximately 3 {times} 10{sup 9} particles/pulse which will require EBIS electron beams on the order of 10A. Pulsed electron beams up to 1.… more
Date: December 31, 1997
Creator: Beebe, E.; Alessi, J.; Hershcovitch, A.; Kponou, A.; Pikin, A.; Prelec, K. et al.
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Partner: UNT Libraries Government Documents Department
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Historical perspective of the H{sup {minus}} Ion Source Symposia

Description: The International Symposium on the Production and Neutralization of Negative Hydrogen Ions and Beams is entering its third decade of providing a forum for the H{sup -} ion source community. The first meeting was held at Brookhaven National Laboratory in 1977 and has returned there every three years to 1995. This is the eighth meeting in this series and for the first time is in Europe, hosted by CEA/Center de Cadarache. Since this Symposium is meeting in Europe many new people have had an opport… more
Date: November 1, 1997
Creator: Schmidt, C.W.
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Partner: UNT Libraries Government Documents Department
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A low power low cost 2.45 GHz ECRIS for the production of multiply charged ions

Description: A low cost, low power ECR ion source designed for the use on a high voltage platform with limited electrical power available, has been developed. To reduce the power consumption of the source the radial and axial magnetic confinement are produced entirely by permanent magnets. An axial magnetic mirror ratio of 2.7 is obtained by a configuration of two times four block magnets. A radial magnetic field of 0.5 T inside the plasma chamber of 60 mm inner diameter is produced by a hexapole magnet. Mi… more
Date: September 1, 1997
Creator: Schlapp, M.; Trassl, R.; Salzborn, E. & Liehr, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ultra-High Intensity Proton Accelerators and their Applications

Description: The science and technology of proton accelerators have progressed considerably in the past three decades. Three to four orders of magnitude increase in both peak intensity and average flux have made it possible to construct high intensity proton accelerators for modern applications, such as: spallation neutron sources, kaon factory, accelerator production of tritium, energy amplifier and muon collider drivers. The accelerator design focus switched over from intensity for synchrotrons, to bright… more
Date: December 31, 1997
Creator: Weng, W. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Prototype Negative Ion Sources for RIB Generation

Description: Radioactive ion beams (RIBs) of {sup 17}F and {sup 18}F are of interest for investigation of astrophysical phenomena such as the hot CNO cycle and the rp stellar nuclear synthesis processes. In order to generate useful beam intensities of atomic F{sup {minus}}, the species must be efficiently and expediently released from the target material, thermally dissociated from fluoride release products during transport to the ionization chamber of the ion source, and efficiently ionized in the source u… more
Date: December 1, 1997
Creator: Alton, G. D.; Murray, S. N.; Welton, R. F.; Williams, C. & Cui, B.
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Partner: UNT Libraries Government Documents Department
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Characterization and recent modification of a compact 10 GHz ECRIS for atomic physics experiments and spectroscopic investigations

Description: A compact 10 ECR ion source (200 mm long, 170 mm diameter) has been developed and tested. The complete magnetic structure made from permanent magnet material is comprised of four ring magnets producing an asymmetric axial magnetic field and a hexapole magnet with a maximum radial field of 0.94 T inside the plasma chamber. The coupling of the microwave to the plasma shows efficient ECR plasma heating at microwave power levels around 10 watts. Charge state distributions for various elements with … more
Date: September 1, 1997
Creator: Schlapp, M.; Trassl, R.; Salzborn, E.; McCullough, R.W. & Greenwood, J.B.
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Partner: UNT Libraries Government Documents Department
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Development of the 3rd Generation ECR ion source

Description: The LBNL 3rd Generation ECR ion source has progressed from a concept to the fabrication of a full scale prototype superconducting magnet structure. This new ECR ion source will combine the recent ECR ion source techniques that significantly enhance the production of high charge state ions. The design includes a plasma chamber made from aluminum to provide additional cold electrons, three separate microwave feeds to allow multiple-frequency plasma heating (at 10, 14 and 18 GHz or at 6, 10 and 14… more
Date: September 1, 1997
Creator: Lyneis, C. M.; Xie, Z. Q. & Taylor, C. E.
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Partner: UNT Libraries Government Documents Department
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Toward a realistic and tractable model for negative ion extraction from volume sources

Description: A new negative ion source extraction model has been formulated and implemented that explicitly considers the motion of positive ions and the volume generation of negative ions. It is found that (1) for high-beam currents, the beam current is limited by a transverse space charge limit, meaning that an increase in negative ion density at the extraction sheath will result in a lower beam current; (2) there is a saddle point with a potential barrier preventing most volume produced negative ions fro… more
Date: December 1, 1997
Creator: Whealton, J.H.; Olsen, D.K. & Raridon, R.J.
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Partner: UNT Libraries Government Documents Department
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Results from E-Mevva and Z-Mevva: Development of new sources of intense high charge state heavy-ion beams

Description: The authors are exploring a new approach for heavy ion beam injection (e.g., into the Relativistic Heavy Ion Collider (RHIC) at BNL), as well as new sources of intense high charge state ions to be mounted on a relatively low voltage platform for high energy ion implantation. While conventional Metal Vapor Vacuum Arc (Mevva) ion sources can produce up to hundreds of milliamps or more of several-times-ionized metal ions (e.g., U3+), the recent results from Batalin et al. indicate that the additio… more
Date: November 1997
Creator: Hershcovitch, A.; Johnson, B. M.; Liu, F.; Anders, A. & Brown, I. G.
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Partner: UNT Libraries Government Documents Department
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Use of fusible beam plugs for accident mitigation at the LANSCE Complex

Description: The LANSCE accelerator relies on a Radiation Security System to provide personnel protection from prompt beam-induced radiation. System faults inhibit beam generation in ion sources until areas are made safe by the automatic insertion of beam plugs (stoppers) for the affected area. Should system failures occur, final protection is provided by reliably-engineered, redundant fusible beam plugs which can intercept the beam at the accelerator injection energy of 750 keV. These plugs auto-insert on … more
Date: January 1, 1997
Creator: Jones, K. W.; Boedeker, W. & Browman, A.
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Partner: UNT Libraries Government Documents Department
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LANSCE Beam Current Limiter (XL)

Description: The Radiation Security System (RSS) at the Los Alamos Neutron Science Center (LANSCE) is an engineered safety system that provides personnel protection from prompt radiation due to accelerated proton beams. The Beam Current Limiter (XL), as an active component of the RSS, limits the maximum average current in a beamline, thus the current available for a beam spill accident. Exceeding the pre-set limit initiates action by the RSS to mitigate the hazard (insertion of beam stoppers in the low ener… more
Date: January 1, 1997
Creator: Gallegos, F.R. & Hall, M.J.
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Partner: UNT Libraries Government Documents Department
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Progress on an EBIS for RHIC

Description: Work is continuing on the development of an Electron Beam Ion source (EBIS) which could be used as part of a new heavy ion injector for RHIC. On a test EBIS, the authors have operated with an electron beam current of up to 1.14A, and have extracted ions such as Tl{sup 41+}, Xe{sup 26+}, Ar{sup 14+}, N{sup 7+}, and Na{sup 7+}. Recent experimental results are reported. In addition, they discuss plans for a new electron beam test stand that is now being built. This will allow operation with electr… more
Date: July 1, 1997
Creator: Alessi, J.; Beebe, E.; Hershcovitch, A.; Kponou, A.; Lockey, R.; Pikin, A. et al.
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Partner: UNT Libraries Government Documents Department
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Report on the workshop on ion sources for hadron colliders

Description: A workshop on Ion Sources for Hadron Colliders was held September 4--5, 1997 in Gelnhausen, Germany. This workshop, organized by the WE-Heraeus-Stiftung Foundation, the University of Frankfurt, Brookhaven National Laboratory, and CERN, directly followed the 7th Symposium on Electron Beam Ion Sources and Traps. Various options were reviewed for the development of a high current, intermediate charge state heavy ion source for use on colliders such as RHIC and LHC. In addition to status reports on… more
Date: November 1, 1997
Creator: Alessi, J.G.
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Partner: UNT Libraries Government Documents Department
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Review of electron beam macroinstabilities and other EBIS related stability and issues

Description: Plasma magnetohydrodynamics and macro-instability theories are briefly reviewed. Although the configuration of any EBIS is inherently susceptible to a number of classical beam instabilities, the small radial dimension of an EBIS plasma prevents modes from occurring in EBIS traps with low beam compression due to physical limitations. In EBIS devices with high electron beam compression, where the potential for beam instabilities is great, the radial dimension is smaller than the Debye length, whi… more
Date: November 1, 1997
Creator: Hershcovitch, A.
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Partner: UNT Libraries Government Documents Department
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Production of highly charged ion beams from ECR ion sources

Description: Electron Cyclotron Resonance (ECR) ion source development has progressed with multiple-frequency plasma heating, higher mirror magnetic fields and better technique to provide extra cold electrons. Such techniques greatly enhance the production of highly charged ions from ECR ion sources. So far at cw mode operation, up to 300 e{mu}A of O{sup 7+} and 1.15 emA of O{sup 6+}, more than 100 e{mu}A of intermediate heavy ions for charge states up to Ar{sup 13+}, Ca{sup 13+}, Fe{sup 13+}, Co{sup 14+} a… more
Date: September 1, 1997
Creator: Xie, Z.Q.
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Partner: UNT Libraries Government Documents Department
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