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WEM1CIO04 |
Transverse Collimation with the Superconducting ECR Ion Source SuSI at the Coupled Cyclotron Facility |
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- G. Machicoane, D.G. Cole, M. Doleans, T. Ropponen, J.W. Stetson, L.T. Sun, X. Wu
NSCL, East Lansing, Michigan, USA
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The Coupled Cyclotron Facility (CCF) at Michigan State University has replaced the old 6.4 GHz Superconducting ECR ion source SCECR with SuSI, a fully Superconducting ECR ion source operating at 18 GHz. The installation of SUSI was completed in September 2009 and since that time the ion source has been routinely used for CCF operation. Prior to the ion source installation to the cyclotron, the initial period of commissioning of SuSI had shown very solid performances for medium charge state ion beams. For example more than 300 eμA of Xe20+ and 400 eμA of Kr13+ have been obtained. However large increase in extracted ion beam current from the ECR ion source will not necessary translate into higher primary beam power on the production target. To optimize the brightness of the beam injected into the K500, a beam collimation scheme has been developed that limit the beam transverse emittance and includes several apertures and solenoids to implement successive cuts to the beam phase space distribution. In this contribution, an overview of the ion source SuSI will be presented. Experimental results from the collimation channel will also be presented and will be compared to simulations.
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Slides WEM1CIO04 [4.486 MB]
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THM1CIO03 |
The Accelerator System for ReA3 - the New Re-accelerated Rare Isotope Beam Facility at MSU* |
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- X. Wu
NSCL, East Lansing, Michigan, USA
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Funding: *This work is supported by the U.S. Department of Energy and National Science Foundation
A new Re-accelerated Rare Isotope Beam Facility: ReA3 is currently being constructed at the Michigan State University (MSU). ReA3 is a novel system proposed to first stop the high energy Rare Isotope Beams (RIBs) created using Coupled Cyclotron Facility (CCF) by the in-flight particle fragmentation method in a helium filled gas system, then increase their charge state with an Electron Beam Ion Trap (EBIT) charge breeder, and finally re-accelerate them to a final energy of ~3 MeV/u. ReA3 will provide opportunities for an experimental program ranging from low-energy Coulomb excitation to transfer reaction studies of astrophysical reactions. The ReA3 accelerator system consists of a Low Energy Beam Transport (LEBT) with an external multi-harmonic buncher, a radio frequency quadrupole (RFQ), a superconducting linac, and a beam distribution system. The superconducting linac will use quarter-wave resonators with optimum \beta of 0.041 and 0.085 for acceleration and superconducting solenoid magnets for transverse focusing. Future energy upgrade to ~ 6 MeV/u or higher is also possible. The paper will discuss the status and recent progress of R&D of the accelerator system for ReA3.
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Slides THM1CIO03 [7.241 MB]
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