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  • 1
    Electronic Resource
    Electronic Resource
    Effect of a biased probe on the afterglow operation of an ECR4 ion source : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 863-865 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Various experiments have been performed on a 14.5 GHz ECR4 in order to improve the ion yield. The source runs in pulsed afterglow mode, and provides currents ∼120 eμA of Pb27+ to the CERN Heavy Ion Facility on an operational basis. In the search for higher beam intensities, the effects of a pulsed biased disk on axis at the injection side were investigated with different pulse timing and voltage settings. No proof for absolute higher intensities was seen for any of these modifications. However, the yield from a poorly tuned/low-performing source could be improved and the extracted pulse was less noisy with bias voltage applied. The fast response on the bias implies that increases/decreases are not due to ionization processes. A good tune for high yield of high charge states during the afterglow coincides with a high plasma potential. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150314
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  • 2
    Electronic Resource
    Electronic Resource
    Status of the CO2 laser ion source at CERN : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 924-926 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A laser ion source using a CO2 laser focused onto a solid target is under study at CERN for the production of high currents of highly charged heavy ions, for possible use in the preinjector for the large hadron collider. A new expansion and extraction layout was installed in this test facility, improving the alignment and making the target to extraction distance more flexible. A two solenoid beam transport system was studied for providing the matching of the beam to a radio-frequency quadrupole. An electrostatic beam transport using gridded electrostatic lenses was designed and constructed as an alternative to a magnetic system. Results show an increased overall current transmission for the electrostatic case. Investigation of the laser parameters required for the production of 1.4×1010 Pb25+ ions in a 5 μs pulse, has been performed using the TIR-1 laser facility at power densities up to 1014 W cm−2 for a focal spot size of 65 μm. The results of the latest scaling are presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150347
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  • 3
    Electronic Resource
    Electronic Resource
    High current metal ion production (invited) : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1248-1252 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Methods of metal ion production will be presented in relation to high current ion sources. The choice of the method of metal ion production will be influenced by the operational conditions of the ion source, in particular by the duty cycle. Various ion sources are discussed in relation to metal ion production. Problems related to formation and transport of metal ion beams will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145023
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  • 4
    Electronic Resource
    Electronic Resource
    Development of heavy ion sources at GSI : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 406-408 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the heavy ion accelerator Unilac Penning ionization gauge (PIG) ion sources are used to deliver multiply charged ions (〈10+) of nearly any element of the periodic table. Typical operational ion currents are given. In the future electron cyclotron resonance (ECR) ion sources will play a dominant role for the Unilac. The development of a new 14-GHz ECR ion source for very high charge states (〈28+ ) was carried out by Centre d'Études Nucléaires de Grenoble at Grenoble for a new Unilac injector. For the new heavy ion synchrotron Schwen Ionen synchrotron higher ion currents than those available from the PIG sources are required. The high current source CHORDIS was developed at Gesellschaft für schwerionenforschung (GSI) to deliver singly charged ions in the 10–100 mA range. In comparison to CHORDIS a Metal vapor vacuum arc ion source is being studied at GSI in cooperation with Lawrence Berkeley Lab. Typical operation conditions and ion yields are given for the different ion sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141254
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  • 5
    Electronic Resource
    Electronic Resource
    Pulsed magnetic field-electron cyclotron resonance ion source operation : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1331-1333 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The pulsed magnetic field (PuMa)-electron cyclotron resonance (ECR) ion source uses a pulsed coil to improve the peak current by opening the magnetic bottle along the beam axis. After demonstration of the principle of the pulsed magnetic extraction, the ion source was tested with different gases. We received promising results from helium to krypton. The influence of the current in the pulsed coil on the analyzed ion current was measured. With increased current levels within the pulsed coil not only the pulse height of the PuMa pulse, but the pulse length can also be controlled. By using the pulsed coil the maximum of the charge state distribution can be shifted to higher charge states. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146710
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  • 6
    Electronic Resource
    Electronic Resource
    A microwave plasma cathode for the high-current CHORDIS ion source : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1344-1346 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The microwave plasma cathodes (MPC) dedicated to high-current ion sources are characterized by long lifetime with reactive gases and a compact structure. An Ishikawa-type MPC developed at GSI Darmstadt coupled with the CHORDIS ion source is presented. The electron current of the MPC is extracted from a dense plasma generated under electron-cyclotron-resonance condition. The axial magnetic field is produced by permanent magnets and ferromagnetic components. The 2.45 GHz microwave power (some tens of watts) is introduced into the plasma chamber via a coaxial line ended with a helical antenna. Experiments with argon and oxygen gas are presented and discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146660
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  • 7
    Electronic Resource
    Electronic Resource
    Ion beam noise reduction method for the MEVVA ion sourcea) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3109-3112 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The beam extracted from the MEVVA ion source tends to be of a relatively high noise level, particularly for the higher charge states, making beam transport difficult in accelerator application. This paper presents experimental results which show that the use of grids within the ion source in combination with a solenoidal magnetic field can decrease the noise of the extracted beam considerably. The noise reduction can be explained by an increase in plasma density due to the applied magnetic field and space charge limitation of the extracted ion beam current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144763
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  • 8
    Electronic Resource
    Electronic Resource
    Status of the pulsed magnetic field electron cyclotron resonance ion source : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1078-1080 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Synchrotrons like the heavy-ion synchrotron SIS at GSI need an efficient low duty cycle injector (typical 1-pulse/s and 200-μs pulse length). To improve the peak current, an electron cyclotron resonance (ECR) ion source has been designed using a pulsed magnetic field (PuMa) to force ion extraction. We replaced the hexapole of a 10-GHz Minimafios ECR ion source by a vacuum chamber containing a water-cooled bilayered solenoid coil and a decapole permanent magnetic structure. A pulse line feeds the solenoid with a 250-μs pulse which increases the magnetic field in the minimum B region by 0.3 T. This process opens the magnetic bottle along the beam axis resulting in an extracted ion pulse. First tests of the PuMa ECR configuration in cw and pulsed operation are presented and analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145068
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  • 9
    Electronic Resource
    Electronic Resource
    ECR ion source and spectrometer for the new high charge state injector at GSI : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2883-2885 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the new high charge state injector (HLI)at GSI a 14.5 GHz electron cyclotron resonance ion source of CAPRICE type was built at CEN-Grenoble. Test bench results were obtained prior to installation at HLI for Ar and Fe including emittance data. The HLI installation of the source and the high-resolution spectrometer is described in some detail. First systematic studies for Ar charge state spectra (including gas mixing) are presented. The spectrometer resolution was tested using Xe isotopes. The analyzed beam is very stable and proved to be well suited for injection into the RFQ accelerator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142786
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of gas added to the MEVVA discharge on the extracted ion beama) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3113-3118 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The presence of background gas in the discharge chamber of the metal vapor vacuum arc source influences the extracted beam. We have observed a strong influence of the background gas pressure in the arc region on the total extracted beam current and on the charge state distribution of the metallic ions. Different gases have been investigated together with different cathode materials. Up to 90% of the total beam current can be gaseous ions, depending on the arc and gas injection conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144764
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