| Paper | Title | Page |
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| TUOP03 | Developments on the 1.4 MeV/u Pulsed Gas Stripper Cell | 387 |
| SPWR028 | use link to see paper's listing under its alternate paper code | |
| TUPRC001 | use link to see paper's listing under its alternate paper code | |
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| The GSI UNILAC in combination with SIS18 will serve as a high-current, heavy-ion injector for the FAIR facility. It must meet high demands in terms of beam brilliance at a low duty factor. As part of an UNILAC upgrade program dedicated to FAIR, a new pulsed gas stripper cell was developed, aiming for increased beam intensities inside the post-stripper. The pulsed gas injection is synchronized with the beam pulse timing, enabling a highly-demanded, increased gas density. First tests using uranium beams on a hydrogen target showed a 60%-increased stripping efficiency into the desired 28+ charge state. In 2015, the setup was improved to be able to deliver increased target thicknesses and enhanced flexibility of the gas injection. In recent beam times, the pulsed gas cell was used with various ion-beam types, to test the capabilities for operation at the GSI UNILAC. The stripping of two ion beams in different gases at different gas densities was successfully tested in mixed-beam operation. Charge fractions, beam emittance, and energy-loss were systematically measured using uranium, bismuth, titanium, and argon beams on hydrogen, helium, and nitrogen targets. Selected results will be presented at the conference. | ||
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Slides TUOP03 [1.131 MB] | |
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Poster TUOP03 [5.943 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP03 | |
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| TUPLR057 | Advanced Design Optimizations of a Prototype for a Newly Revised 4-Rod CW RFQ for the HLI at GSI | 586 |
| SPWR011 | use link to see paper's listing under its alternate paper code | |
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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 upgraded for cw operation. The dedicated new 4-Rod RFQ structure is currently being designed at the Institute for Applied Physics (IAP) of the Goethe University of Frankfurt. The overall design is based on the RFQ structures that were originally developed for FRANZ* and MYRRHA**. Regarding the HLI-RFQ the comparatively low operating frequency of 108 MHz causes a general susceptibility towards mechanical vibrations especially concerning the electrodes because of the necessarily larger distance between the stems. Besides RF simulations and basic thermal simulations with CST Studio Suite, the key issues like mechanical electrode oscillations as well as temperature distribution from heat loss in cw operation are investigated with simulations using ANSYS Workbench. At first instance a dedicated 6-stem prototype is currently being manufactured in order to validate the simulated RF performance, thermal behavior and structural mechanical characteristics.
*M. Heilmann et al., A Coupled RFQ-IH Cavity for the Neutron Source FRANZ, IPAC13 **C. Zhang, H. Podlech, New Reference Design of the European ADS RFQ Accelerator For MYRRHA, IPAC14 |
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Poster TUPLR057 [1.484 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR057 | |
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| TH1A03 | Development of New Heavy Ion Linacs at GSI | 688 |
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| The heavy ion linac UNILAC at GSI will be upgraded in order to meet the beam requirements imposed by the upcoming FAIR facility. This upgrade includes several innovative techniques and applications. They comprise a new gaseaous stripper with enhanced efficiency, full 4d transverse emittance measurements, a round-to-flat beam adaptor, asymmetric transverse focusing along the new Alvarez DTL, optimized shape of the drift tube surface w.r.t. shunt impedance per surface field, and a field stabilization and tuning scheme without post-couplers. Additionally, we report on development of a super-conducting cw linac for intermediate mass ions which will be dedicated to production of super heavy elements close to the Coulomb barrier. | ||
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Slides TH1A03 [3.016 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A03 | |
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| TH2A03 | Complete Transverse 4D Beam Characterization for Ions Beams at Energies of Few MeV/u | 720 |
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| Measurement of the ion beam rms-emittances is done through determination of the second order beam moments. For time being the moments quantifying the amount of inter-plane coupling, as <xy'> for instance, have been accessible to measurements just for very special cases of ions at energies below 200 keV/u using pepperpots. This talk presents successful measurements of all inter-plane coupling moments at 1 to 11 MeV/u. From first principles the used methods are applicable at all ion energies. The first campaign applied skewed quadrupoles in combination with a regular slit/grid emittance measurement device. The second campaign used a rotatable slit/grid device in combination with regular quadrupoles. | ||
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Slides TH2A03 [17.343 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH2A03 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |