Paper | Title | Page |
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TUPWO059 | Reducing Emittance of a H− Beam in a Solenoid-based Low-energy Beam Transport through Numerical Modeling | 2000 |
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Funding: This work is supported by the US DOE Office of Science, Office of Basic Energy Sciences, including grant No. DE-SC0000844 A solenoid-based low-energy beam transport (LEBT) subsystem is under development for the H− linac front end of the Spallation Neutron Source. The LEBT design includes MHz frequency chopping of the partially neutralized H− beam that can potentially lead to beam instabilities. We report results of numerical modeling using the parallel Vorpal framework for 3D electrostatic particle-in-cell (PIC) to simulate H− beam dynamics in the LEBT, over multiple chopping events. We detail how the addition of a positively biased potential barrier near the entrance of the chopper can improve LEBT performance by eliminating chopper-induced emittance increases over many chopping events. DLB is now at University of Colorado, Boulder |
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