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  • 1
    Electronic Resource
    Electronic Resource
    Experiments on a 14.5 GHz electron cyclotron resonance 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. 643-645 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The 14.5 GHz ECR4 source supplied to CERN in the framework of the heavy ion facility collaboration provided Pb27+ operational beams to a new heavy ion linac in 1994. This source, which operates in the pulsed "afterglow" mode, has surpassed its design specification of 80 eμA and now provides currents 〉120 eμA on an operational basis for this charge state. Early tests showed the existence of extremely stable modes of operation which are fully exploited, and in 1996 the source was operational on a 24 h basis for more than 2400 h. Future operational requirements will benefit from the 10 Hz repetition rate of the source, but will require beam pulse length modulation. In the search for higher intensities a number of experiments were performed on gas composition, rf power matching, extraction, plasma chamber liner, and a biased dynode. The results of these tests will be presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148535
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  • 2
    Electronic Resource
    Electronic Resource
    Developments at the CERN laser 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. 1051-1053 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The high current, high charge-state ion beam which can be extracted from a laser produced plasma is well suited, after initial acceleration, for injection into synchrotrons. At CERN, the production of a heavy ion beam using a CO2 laser ion source is studied. The latest results of experiments with a tantalum ion beam with charge states up to 23+ and accelerated by a radio frequency quadrupole from 6.9 to 100 keV/u, are presented along with simulations of the low energy beam transport. The ion yield at the desired charge state, the pulse to pulse stability of the ion beam, and the system reliability are all of major interest. Work is under way to replace the low repetition rate free-running laser oscillator by a master oscillator and power amplifier system. The master oscillator is operational and the first results of measurements of its beam quality and stability are presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148630
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental investigation of the afterglow of the pulsed electron cyclotron resonance discharge : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1334-1336 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: During the afterglow of the pulsed electron cyclotron resonance discharge, currents can be extracted, which are substantially higher than the ion current during the heating phase of the plasma. This is especially the case for the high charge states of heavy ions. An operating regime was found, which gives an extremely stable and reproducible afterglow. The variation from pulse to pulse is hardly visible and the long-term stability is also very good. This mode, which made the setting up and operation of the accelerators much easier than is normally the case, can also give an insight into the processes responsible for the afterglow. An investigation of the shape and duration of the afterglow for the different charge states of lead is presented. A 1/ζ2 dependence for the decay time of the afterglow was found for operation with oxygen, while no such dependence appears for operation with neon as the auxiliary gas. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146711
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  • 4
    Electronic Resource
    Electronic Resource
    Laser ion source development at CERN : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1337-1339 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At CERN there is a demand for high currents of highly charged ions, presently for fixed target experiments at the SPS and in the future for the LHC project. The LHC, however, requires an intensity, which is an order of magnitude larger than the intensity presently achieved using an electron cyclotron resonance ion source. Laser ion sources have the potential to fulfill the LHC requirements, although a large number of technical problems have to be overcome. At CERN a project to investigate the feasibility of the application of laser ion sources was started in 1989 and a source capable of producing large currents of highly charged ions was constructed. The results of the investigations on this source, including charge state distributions, measurements of the energy distribution, measurements of ion currents, and emittance measurements will be presented. Furthermore a method to reduce the time-dependent energy change is described. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146712
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  • 5
    Electronic Resource
    Electronic Resource
    Multiply charged ion generation from NIR and visible laser-produced plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 950-952 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Results of experiments on ion production from Ta target using ∼350 ps pulses of the iodine photodissociation laser PERUN are presented and analysed. Ta ions with charge states higher than 45+ and with energies 8 MeV were registered in a far expansion zone (∼2 m). Theoretical interpretation of the results is possible by considering that the plasma temporal evolution follows the mechanism of two-temperature isothermal expansion. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146780
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  • 6
    Electronic Resource
    Electronic Resource
    The laser ion source test facility at CERN : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2838-2840 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Due to the growing demand for high currents of highly charged heavy ions the potential of laser ion sources is investigated at CERN. A test facility consisting of a 50-J carbon dioxide laser, a versatile ion production chamber, and electrostatic and magnetic analyzing systems has recently been put into operation. First results of charge state analysis as well as plasma temperature measurements are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142770
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  • 7
    Electronic Resource
    Electronic Resource
    Operating principle of the plasma beam ion source : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 330-332 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The plasma beam ion source is a high current ion source of the plasmatron family. It was originally designed for the injection of low energy proton beams into RFQ accelerators. The source consists of a duoplasmatron and one or two adjacent chambers, where the plasma from the primary DP-discharge is guided and compressed by an inhomogeneous solenoidal field. A high density plasma column of 200 mm length and 1–4 mm diameter is formed. In this second stage the plasma can be manipulated with a great degree of independence from the primary discharge, thus allowing, for instance, the adjustment of the electron energy to enhance a certain ionization process (e.g., a proton fraction 〉90% can be obtained). With argon as an auxiliary gas in the primary discharge the production of oxygen ions in the second stage is possible. By the insertion of a probe into the fringe of the plasma beam and the subsequent evaporation, ions from various solids including carbon, iron, copper, or tungsten have been produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141285
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  • 8
    Electronic Resource
    Electronic Resource
    Acceleration of light ions from a laser source in a four vane radio frequency quadrupole : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1089-1091 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Laser ion sources have a great potential for the production of large numbers of highly charged heavy ions as required for fixed target experiments at the SPS and for the future LHC. However, the beam from a laser ion source (LIS) has certain characteristics, like the short pulse duration, the high total current, the large energy spread and the time varying beam divergence, which make its acceleration in the subsequent linear accelerators difficult. As the first accelerator for the injector chain will be a radio frequency quadrupole (RFQ), a proof of principle of acceleration of ions from the laser ion source was performed, using a 200 MHz four-vane RFQ. This structure, which was originally designed for the preacceleration of light ions for CERN's LINAC I, requires an injection energy of 5.6 keV/u and is therefore not well suited for ion beams from a LIS. In spite of this drawback, ion currents approaching the space-charge limit of the RFQ (i.e., several mA of Al9+–Al11+), could be accelerated. The results of these experiments and the special problems of the application of the LIS will be presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146765
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of the ion beam obtained from a small multicusp ion source : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 327-329 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The small multicusp ion source developed at Lawrence Berkeley Laboratory (LBL) has been equipped with a low voltage ratio, single aperture extraction system. The influence of the potential of the plasma electrode and of a dipole filter field on the beam emittance are measured. A simple method to reduce hash is suggested. The aim of these investigations is to produce nitrogen ion beams with a high atomic ion fraction and a low emittance as required for a RFQ-accelerator, which will be built for ion implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141284
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  • 10
    Electronic Resource
    Electronic Resource
    Pulsed ECR source in afterglow operation at CERN : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1328-1330 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A pulsed 14 GHz ECR4 source, adapted to operate in the afterglow mode, was delivered by GANIL to CERN in the framework of the Heavy Ion Facility Project. After four months of operation to commission the facility, it completed its first operational run of nine weeks at the end of 1994, providing lead ions to nuclear physics and ion cooling experiments. A very stable beam, with a useful length of over 1 ms, of 80 eμA of Pb27+ was provided by the source over this period. The operational problems experienced during the commissioning and operation, and the investigations to improve performance for the next experimental physics run are presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146709
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