Abstract
At the GSI Helmholtzzentrum f\ur Schwerionenforschung (GSI) in Darmstadt, Germany, a prototype cryomodule (advanced demonstrator) for the superconducting (SC) continuous wave (CW) Helmholtz Linear Accelerator (HELIAC) is under construction. A transport line, comprising quadrupole lenses, rebuncher cavities, beam correctors, and adequate beam instrumentation has been built to deliver the beam from the GSI 1.4 MeV/u High Charge Injector (HLI) to the advanced demonstrator, which offers a test environment for SC CW multigap cavities. In order to achieve proper phase space matching, the beam from the HLI must be characterized in detail. In a dedicated machine experiment the bunch shape has been measured with a nondestructive bunch shape monitor (BSM). Therefore, different bunch projections were obtained by altering the voltage of two rebunchers. These measurements were combined with dedicated beam dynamics simulations using the particle tracking code dynamion. The longitudinal bunch shape and density distribution at the beginning of the matching line are fully characterized by a tomographic reconstruction method based on a non-negative least square minimization approach.
Highlights
Super heavy element (SHE) research performs particle collision experiments with medium weight to heavy ions on heavy targets to cause fusion evaporation reactions
As shown as measured traces arranged as waterfall diagram, the bunch shape is asymmetric due to the KONUS beam dynamics of the HLI-interdigital H-mode cavity (IH)-DTL
This makes the use of an advanced reconstruction technique necessary, which considers nonelliptical, arbitrary bunch shapes in the longitudinal phase plane
Summary
Super heavy element (SHE) research performs particle collision experiments with medium weight to heavy ions on heavy targets to cause fusion evaporation reactions. For different modern facilities worldwide, the operation of SC and CWLinacs is a key technology, as for the Spallation Neutron Source (SNS) in the U.S [17], or medium energy applications in isotope generation, material science and boronneutron capture therapy [18,19,20]. All these ambitious projects strongly rely on proper beam diagnostics, as minimal beam loss is a critical requirement to the machines as well as for superconducting multigap cavities [21,22]
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