Author: Groening, L.
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MOPMB011 ROSE, Measuring the Full 4D Transverse Beam Matrix of Ion Beams 98
 
  • M.T. Maier, X. Du, P. Gerhard, L. Groening, S. Mickat, H. Vormann, C. Xiao
    GSI, Darmstadt, Germany
 
  A ROtating System for Emittance measurements ROSE, to measure the full 4 dimensional transverse beam matrix of an ion beam has been developed and commissioned. Different ion beams behind the HLI at GSI have been used in two commissioning beam times. All technical aspects of ROSE have been tested, ROSE has been benchmarked against existing emittance scanners for horizontal and vertical projections, and the method, hard-, and software to measure the 4D beam matrix has been upgraded, refined, and successfully commissioned. The inter plane correlations of the HLI beam have been measured, yet as no significant initial correlations were found to be present, controlled coupling of the beam by using a skew triplet has been applied and confirmed with ROSE. The next step is to use ROSE to measure and remove the known inter plane correlations of a uranium beam before SIS18 injection.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB011  
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MOPOY016 HSI RFQ Upgrade for the UNILAC Injection to FAIR 877
 
  • C. Zhang, L. Groening, O.K. Kester, S. Mickat, H. Vormann
    GSI, Darmstadt, Germany
  • M. Baschke, H. Podlech, U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main, Germany
 
  As an injector to the future FAIR facility, the UNILAC accelerator is required to deliver ion beams with high intensities as well as good beam quality. The electrodes of the current HSI RFQ are exhausted and the current RFQ itself is assigned to be one bottle-neck for improving the brilliance performance of the whole linac. Based on the so-called NFSP (New Four-Section Procedure) method, a new RFQ electrode design has been developed and optimized for 20 emA, U4+ beams at the RFQ entrance. Since only the electrodes will be replaced, the RFQ length has been kept unchanged. Even with a lowered inter-vane voltage, the new RFQ design has achieved better beam performance compared to the previous design. This paper will focus on the performed study with respect to beam dynamics.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY016  
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MOPOY017 Upgrade of the Universal Linear Accelerator UNILAC for FAIR 880
 
  • L. Groening, A. Adonin, X. Du, R. Hollinger, E. Jäger, M.T. Maier, S. Mickat, A. Rubin, B. Schlitt, G. Schreiber, H. Vormann, C. Xiao, A. Yakushev, C. Zhang
    GSI, Darmstadt, Germany
  • M. Baschke, H. Hähnel, H. Podlech, U. Ratzinger, A. Seibel, R. Tiede
    IAP, Frankfurt am Main, Germany
  • Ch.E. Düllmann, P. Scharrer
    HIM, Mainz, Germany
 
  In order to meet the requirements on beam parameters for the upcoming FAIR facility at GSI, the injector linac UNILAC will be upgraded. The activities comprise development of the sources for stable provision of intense uranium beams at a repetition rate of 2.7 Hz, a revision of the beam dynamics layout of the 120 keV/u RFQ, the replacement of the matching section to the 1.4 MeV/u pre-stripper DTL, and enhancement of the gaseous stripping section efficiency. This section shall also include a round-to-flat emittance adaptor to prepare the beam for injection into the synchrotron SIS18 which has a flat transverse injection acceptance. Finally, the upgrade includes the complete replacement of the 40 year old 11.4 MeV/u Alvarez-type post-stripper DTL with a new DTL, preferably using Alvarez-type cavities with improved beam focusing features, as well as its rf-power alimentations.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY017  
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MOPOY018 The New RF Design of the 36 MHz-HSI-RFQ at GSI 883
 
  • M. Baschke, H. Podlech
    IAP, Frankfurt am Main, Germany
  • L. Groening, S. Mickat, C. Zhang
    GSI, Darmstadt, Germany
 
  In Darmstadt / Germany the existing accelerator cite GSI is expanding to one of the biggest joint research projects worldwide: FAIR, a new antiproton and ion research facility with so far unmatched intensities and quality. The existing accelerators will be used as pre-accelerators and therefor need to be upgraded to fulfill the requirements with respect for intensity and beam quality. In a first step the 9.2 m long 36 MHz-HSI-RFQ for high current beams will get new electrodes to reach the specific frequency, to allow a higher electric strength and to avoid unwanted multipole components. Therefor several simulations with CST MWS have been done. The parameters and results of the RF-design will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY018  
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MOPOY020 Prototype Design of a Newly Revised CW RFQ for the High Charge State Injector at GSI 889
SUPSS044   use link to see paper's listing under its alternate paper code  
 
  • D. Koser, H. Podlech
    IAP, Frankfurt am Main, Germany
  • P. Gerhard, L. Groening, O.K. Kester
    GSI, Darmstadt, Germany
 
  Within the scope of the FAIR project (Facility for Antiproton and Ion Research) at GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, the front end of the existing High Charge State Injector (HLI) is planned to be upgraded for cw operation. The required newly revised 4-Rod RFQ structure is currently being designed at the Institute for Applied Physics (IAP) of the Goethe University of Frankfurt. It will be operated with a 100 kW power amplifier at 108 MHz. At first instance a dedicated 4-stem prototype, which is based on the RFQ design for MYRRHA* and FRANZ**, is planned to be manufactured in order to validate the simulated RF performance, thermal behavior and mechanical characteristics in continuous operation. The RF simulations as well as basic thermal simulations are done using CST Studio Suite. In order to prevent oscillations of the electrodes mechanical eigenmodes are analyzed using ANSYS Multiphysics. In addition the ANSYS software allows more sophisticated simulations regarding the cooling capability by considering fluid dynamics in water cooling channels, thus providing a more detailed thermal analysis.
*C. Zhang, H. Podlech, New Reference Design of the European ADS RFQ Accelerator For MYRRHA, IPAC2014
**M. Heilmann et al., A Coupled RFQ-IH Cavity for the Neutron Source FRANZ, IPAC2013
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY020  
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TUPMR058 An Upgrade for the 1.4 MeV/u Gas Stripper at the GSI UNILAC 1394
 
  • P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev
    HIM, Mainz, Germany
  • W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev
    GSI, Darmstadt, Germany
  • Ch.E. Düllmann
    Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany
  • P. Scharrer
    Mainz University, Mainz, Germany
 
  The GSI UNILAC will serve as part of an injector system for the future FAIR facility, currently under construction in Darmstadt, Germany. For this, it has to deliver short-pulsed, high-current, heavy-ion beams with highest beam quality. An upgrade for the 1.4 MeV/u gas stripper is ongoing to increase the yield of uranium ions in the desired charge state. The new setup features a pulsed gas injection synchronized with the beam pulse transit to increase the effective density of the stripper target while keeping the gas load for the differential pumping system low. Systematic measurements of charge state distributions and energy-loss were conducted with 238U-ion beams and different stripper gases, including H2 and He. By using H2 as a stripper gas, the yield into the most populated charge state was increased by over 50%, compared to the current stripper. Furthermore, the high gas density, enabled by the pulsed injection, results in increased mean charge states.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR058  
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