MOC —  Cyclotron Technology, Ion Sources and Upgrades   (23-Sep-19   16:00—17:10)
Chair: P.M.T. Heikkinen, JYFL, Jyväskylä, Finland
Paper Title Page
Moving the Frontiers of the Production of Intense Beams of Highly Charged Ions With ECR Ion Sources  
  • L.T. Sun
    IMP/CAS, Lanzhou, People’s Republic of China
  Electron Cyclotron Resonance (ECR) ion source has always been regarded as the most powerful machine to produce intense highly charged ion beams, which is essentially important for the development of heavy ion cyclotrons and linacs. Worldwide ECR ion source development has stepped into the era of 4th generation that needs to solve series of technical and physics problems. Nevertheless, the 3rd generation ECR ion sources are still the most advanced machines to produce very intense highly charged ion beams, such as 0.66 emA Ca12+, 1.4 emA Ar12+, 0.8 emA Xe27+, 16.7 euA Xe42+, 0.68 emA Bi31+, 3 euA Bi56+, 400 euA U34+ and so on. These results can obviously improve the existing heavy ion facilities performance and have fundamental impact to the development of future facilities as well. This paper will review the worldwide achievements on high performance ECR ion source development in recent years.  
slides icon Slides MOC01 [28.990 MB]  
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MOC02 A Pathway to Accelerate Ion Beams up to 3 GeV with a K140 Cyclotron 119
  • D.Z. Xie, L. Phair, D.S. Toddpresenter
    LBNL, Berkeley, California, USA
  Funding: U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract number DE-AC02-05CH11231
The capabilities of the K140 88-Inch Cyclotron at Lawrence Berkeley National Laboratory (LBNL) have been extensively enhanced through generations of electron cyclotron resonance ion sources (ECRISs). The cyclotron has evolved from a light-ion accelerator into a proton to uranium accelerator and has accelerated ultra-high charge state heavy ions, such as xenon and uranium. Recently, with 124Xe49+ ions injected from VENUS (a 3rd generation ECR ion source) the 88-Inch Cyclotron reached a new record of ~ 2.6 GeV.* This is an energy increase of about fifteen-fold over what this K140 cyclotron could achieve when it started operation almost six decades ago. A 4th generation ECR ion source, MARS-D, is under development and will further raise the output energy of the cyclotron. With the higher ion charge states produced that are anticipated with a new ECR ion source, the 88-Inch Cyclotron ought to be able to accelerate ion beams of energies of 3 GeV and higher for the radiation effects testing community. This paper will present and discuss the development of the MARS-D ECR ion source and the 88-Inch Cyclotron’s recent and possible future achievements.
*: D. Z. Xie, W. Lu, J. Y. Benitez, M. J. Regis, Recent Production of Ultra-High Charge State Ion Beams with VENUS, Proc. of the 23rd Int’l Workshop on ECR Ion Sources, Catania, Italy, Sept, 2018.
slides icon Slides MOC02 [11.895 MB]  
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About • paper received ※ 16 September 2019       paper accepted ※ 24 September 2019       issue date ※ 20 June 2020  
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MOC03 Upgrade of the PSI Injector 2 Cyclotron 123
  • M. Schneider, J. Grillenberger
    PSI, Villigen PSI, Switzerland
  The high intensity proton accelerator facility at PSI is capable of providing beam currents of up to 2.4 mA at a kinetic energy of 590 MeV. PSI is following an upgrade plan to further increase the beam power and to further minimize proton losses. Up to now, this has mainly been achieved by the installation of high gradient copper resonators in the Ring cyclotron and the installation of more powerful RF-amplifiers. Currently, PSI follows a similar approach for the Injector 2 cyclotron providing 72 MeV protons for the injection into the 590 MeV Ring cyclotron. In order to increase the turn separation in the injector cyclotron which results in lower relative beam losses, the two 150 MHz resonators operated in accelerating mode are replaced with two 50 MHz Aluminum resonators providing higher acceleration voltage. This paper describes the status of the upgrade, i.e., the replacement of the first resonator and related hardware.  
slides icon Slides MOC03 [10.052 MB]  
DOI • reference for this paper ※  
About • paper received ※ 13 September 2019       paper accepted ※ 26 September 2019       issue date ※ 20 June 2020  
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