Accelerator Systems and Components
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MO3I3 Heavy Ion Stripping 24
  • P. Gerhard, M.T. Maier
    GSI, Darmstadt, Germany
  Ion stripping is primarily an essential technique for heavy ion accelerators in order to reach higher beam energies within reasonable size and budget limits. Due to the nature of the stripping process, the resulting ion beam contains ions of different charge states. Therefore, high beam loss is typically associated, making the net stripping efficiency one of the decisive elements of the overall performance of an accelerator or facility. Several technical implementations of strippers have been and are still being developed in order to obtain optimal stripping for different ions and beam energies by employing different kinds of stripping targets, namely gaseous, solid and more recently fluid materials. High beam intensities resulting in prohibitive energy deposition and target destruction are challenging. Optimizing a stripper may potentially increase the overall performance by a large factor with less effort than other actions. This gave rise to the pulsed gas stripper project at the GSI UNILAC. This talk will give an overview of different strippers at GSI and beyond. The second part will give a detailed report on the introduction of hydrogen at the GSI gas stripper.  
slides icon Slides MO3I3 [53.513 MB]  
DOI • reference for this paper ※  
About • Received ※ 21 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022  
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MO4I2 Liquid Lithium Charge Stripper Commissioning with Heavy Ion Beams and Early Operations of FRIB Strippers 31
  • T. Kanemura, N.K. Bultman, R. Madendorp, F. Marti, T. Maruta, Y. Momozaki, J.A. Nolen, P.N. Ostroumov, A.S. Plastun, H.T. Ren, A. Taylor, J. Wei, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • M.J. LaVere
    MSU, East Lansing, Michigan, USA
  • Y. Momozaki, J.A. Nolen
    ANL, Lemont, Illinois, USA
  Funding: This work is supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) at Michi-gan State University is a 400 kW heavy ion linear accel-erator. Heavy ion accelerators normally include a charge stripper to remove electrons from the beams to increase the charge state of the beams thus to increase the energy gain. Thin carbon foils have been the traditional charge stripper but are limited in power density by the damage they suffer (sublimation and radiation damage) and con-sequently short lifetimes. Because of the high beam pow-er, FRIB had decided to use a liquid lithium charge strip-per (LLCS), a self-replenishing medium that is free from radiation damage. FRIB recently commissioned a LLCS with heavy ion beams (36Ar, 48Ca, 124Xe and 238U beams at energies of 17-20 MeV/u). Since there had been no exper-imental data available of charge stripping characteristics of liquid lithium, this was the first demonstration of charge stripping by a LLCS. The beams were successfully stripped by the LLCS with slightly lower charge states than the carbon foils of the same mass thickness. The LLCS started serving the charge stripper for FRIB user operations with a backup rotating carbon foil charge stripper. FRIB has become the world’s first accelerator that utilizes a LLCS.
slides icon Slides MO4I2 [6.337 MB]  
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About • Received ※ 26 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
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3D Printing (Additive Manufacturing) Applied to Accelerator Components  
  • T. Torims
    Riga Technical University, Riga, Latvia
  The speaker did not provide an abstract.  
slides icon Slides TU1I1 [60.918 MB]  
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