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  • 1
    Electronic Resource
    Electronic Resource
    The new BNL polarized negative ion source : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2628-2630 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new ground state source of negative hydrogen ions with polarized nuclei (H−) is being developed at BNL. Extensive developmental research has been aimed at improving each element of (H−) production: cold H° beam, spin selection and focusing magnets, and ionizer. These elements have recently been integrated into a source. A first test with the accommodator nozzle cooled only to liquid nitrogen temperatures resulted in 5 μA of H−. Tests at liquid helium temperatures are now beginning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142860
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  • 2
    Electronic Resource
    Electronic Resource
    Brookhaven National Laboratory electron beam test stand : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 697-699 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The main purpose of the electron beam test stand (EBTS) project at the Brookhaven National Laboratory is to build a versatile device to develop technologies that are relevant for a high intensity electron beam ion source (EBIS) and to study the physics of ion confinement in a trap. The EBTS will have all the main attributes of EBIS: a 1-m-long, 5 T superconducting solenoid, electron gun, drift tube structure, electron collector, vacuum system, ion injection system, appropriate control, and instrumentation. Therefore it can be considered a short prototype of an EBIS for a relativistic heavy ion collider. The drift tube structure will be mounted in a vacuum tube inside a "warm" bore of a superconducting solenoid, it will be at room temperature, and its design will employ ultrahigh vacuum technology to reach the 10−10 Torr level. The first gun to be tested will be a 10 A electron gun with high emission density and magnetic compression of the electron beam. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148465
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  • 3
    Electronic Resource
    Electronic Resource
    Status of the Brookhaven National Laboratory high current electron beam ion source test stand : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 893-895 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: As part of a new, compact heavy ion injector for the AGS/RHIC complex at Brookhaven National Laboratory we are developing an electron beam ion source (EBIS) that would satisfy present and future requirements. Such a source should be capable of producing intensities of, e.g., Au35+ ions of about 3×109 particles/pulse or U45+ of about 2×109 particles/pulse. To achieve this, the required e-beam intensity is 10 A, at a pulse length of 100 ms. An EBIS test stand has been constructed, designed for the full electron beam power and having close to 1/2 of the trap length of an EBIS for RHIC. Initial electron beam tests have resulted in a 50 μs, 13 A electron beam. Ion production and extraction has been shown with a 3.1 A, 50 ms electron beam, achieving an ion yield of 19 nC/pulse (neutralization degree of 61%); fast extraction trials have yielded extracted ion pulses of 1 mA peak current and 18 μs at FWHM. Details of the test stand construction, results of the electron beam studies, and properties of the extracted ion pulse are presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150324
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental results from the Brookhaven National Laboratory test electron beam ion source : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 640-642 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At Brookhaven National Laboratory, an Electron Beam Ion Source (EBIS) is operational and has produced charge states such as N7+, Ar16+, and Xe26+ using neutral gas injection. Ions such as Na7+ and Tl41+ have been produced using external ion injection. The BNL EBIS effort is directed at reaching intensities of interest to RHIC, approximately 3×109 particles/pulse which will require EBIS electron beams on the order of 10 A. Pulsed electron beams up to 1.14 A have been produced using a 3 mm LaB6 cathode. Ion yields corresponding to 50% of the maximum trap capacity for electron beams up to 0.5 A have been obtained. The goal for the TestEBIS is to produce a uranium ion charge state distribution peaked at U45+ with 50% of the trap capacity for a 1 A electron beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148726
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  • 5
    Electronic Resource
    Electronic Resource
    Report on the workshop on ion sources for hadron colliders (invited) : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1040-1044 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: 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 electron cyclotron resonance, electron beam ion source, and laser sources, there was also discussion of issues relevant to the scaling of these sources to intensities as required by RHIC and LHC. The presentations and discussions from this workshop are summarized. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148709
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  • 6
    Electronic Resource
    Electronic Resource
    Development of an electron-beam ion source for a relativistic heavy-ion collider preinjector : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 878-880 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At Brookhaven National Laboratory (BNL), an electron-beam ion source (EBIS) is operational as a test bed for development of a high current EBIS for relativistic heavy-ion collider (RHIC). Previously, the goal of most EBIS research has been to produce bare or nearly bare nuclei. At BNL, the EBIS is required to produce only medium charge states of heavy ions, e.g., Au35+, since there is further stripping at higher energies. The BNL effort is directed at reaching intensities of interest to RHIC, approximately 3×109 particles/pulse, which will require an EBIS electron beam on the order of 10 A. Initial tests using a 1 mm LaB6 cathode have produced electron beam currents up to the design value of 110 mA. A 2 mm LaB6 cathode has been installed and in a first run has produced currents up to 350 mA. This source has so far produced charge states up to Ar16+ using neutral gas injection, and up to Tl50+ using external ion injection. Results of these studies and ion injection trials are presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146827
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  • 7
    Electronic Resource
    Electronic Resource
    H− source and low energy transport for an RFQ preinjector : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 625-627 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A radio-frequency quadrupole (RFQ) accelerator has replaced a 750-keV Cockcroft-Walton as the H− preinjector for the Brookhaven alternating gradient synchrotron. A magnetron surface-plasma source with a circular aperture is used to produce 65–100 mA of H− at 35 keV with a discharge current of less than 20 A. The symmetry of the beam is maintained in the 2-m transport to the RFQ via the use of magnetic solenoids for focusing. Currents up to 60 mA have been obtained out of the RFQ. A traveling-wave electrostatic chopper in the 35-keV transport line leads to a distortion of the emittance due to space-charge effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141939
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  • 8
    Electronic Resource
    Electronic Resource
    Performance of a volume H− ion source with a toroidal discharge chamber : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 415-417 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new volume H− ion source with a toroidal discharge chamber has been designed. Its main feature is a full rotational symmetry, including a conically shaped dipole field separating the main toroidal discharge from the central extraction chamber. Measurements of the H− yield and the accompanying electron component have been performed, both for this rotationally symmetric geometry and for a standard line dipole geometry. With the rotationally symmetric geometry, the H− yield was up to 30 mA through an aperture of 1 cm2 , while the ratio Ie /IH− depended greatly on the value of IH− and was about 20–30 for the highest currents. The beam emittance was measured for the rotationally symmetric geometry, and was found to be εn (90%)≈0.094 π cm mrad for a 21-mA beam. An estimate of the H− ion temperature from the measured emittance gives a value of approximately 3.6 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141257
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  • 9
    Electronic Resource
    Electronic Resource
    BNL intense polarized H− source progress : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 403-405 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Components are being developed which will eventually be part of a high-current polarized H− source. An atomic beam has been cooled to 6 K, resulting in a most probable velocity of approximately 680 m/s and a forward flux of about 3×1020 H0/sr/s. Focusing of this beam with a superconducting solenoid was unsuccessful at high H0 densities due to H0-H0 scattering. A permanent magnet sextupole is now being tested. An ionizer based on the charge exchange of the polarized H0 with ≈150-eV D− has also been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141954
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  • 10
    Electronic Resource
    Electronic Resource
    BNL volume H− source : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2717-2719 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The volume H− ion source under development at Brookhaven is unique in that it has a toroidal plasma region, which feeds ions into the central extraction region through a conically shaped filter field. In pulsed operation, it produces 25 mA of H− in a 1 cm2 aperture, with an electron-to-H− ratio of ≈3. At 19 mA, a normalized, 90% emittance of 0.44 π mm mrad has been measured. Up to 50 mA has been extracted through a 1.87 cm2 aperture. Although not designed for steady state operation, up to 6 mA has been extracted dc. The addition of xenon to the discharge was found to improve the source output by 20%–70%. The circular magnetic cusp field geometry was found to be more favorable than radial cusp fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142833
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