| Paper | Title | Page |
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| MOPAB17 | RMS Emittance Measures for Solenoid Transport and Facitlity for Rare Isotope Beams Front-End Simulations | 57 |
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Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Grant No. PHY-1102511. Measurement of beam phase-space area via rms emittances in solenoid focusing channels with linear x-y coupling is complicated relative to transport channels with decoupled plane focusing. This stems from correlated azimuthal flow of the beam induced by the coupled focusing influencing how the thermal component of the flow should be measured. This is exacerbated when the beam has finite canonical angular momentum – as is the case for beams born in a magnetic field in ECR-type sources. In this study, simple measures of rms emittance for use in solenoid transport for beams with canonical angular momentum are motivated and overviewed. Emphasis is placed on simple to interpret emittance measures which reduce to familiar forms for decoupled plane motion. These emittances are applied in Warp PIC simulations of the near-source region of the FRIB linac front-end. In these simulations, a multi-species heavy-ion dc beam emerging from an ECR source are simulated primarily in transverse slice mode using a realistic lattice description. Emittance growth due to nonlinear applied fields, space-charge, and partial neutralization is analyzed including the influence of net canonical angular momentum. |
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