Beam dynamics studies in the driver LINAC pre-stripper section of the RIA facility |
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Authors: | E S Lessner P N Ostroumov |
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Institution: | (1) Argonne National Laboratory, 9700 S. Cass Avenue, 60439 Argonne, IL, USA |
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Abstract: | The RIA facility driver LINAC consists of about 400 superconducting (SC) independently phased rf cavities. The LINAC is designed
to accelerate simultaneously several charge-state beams to generate as much as 400 kW of uranium beam power. The LINAC beam
dynamics is most sensitive to the focusing and accelerating structure parameters of the pre-stripper section, where the uranium
beam is accelerated from 0.17 keV/u to 9.4 MeV/u. This section is designed to accept and accelerate two charge states (28
and 29) of uranium beam from an ECR ion source. The pre-stripper section must be designed to minimize the beam emittance distortion
of this two-charge-state beam. In particular, the inter-cryostat spaces must be minimized and beam parameters near transitions
of the accelerating and focusing lattices must be matched carefully. Several sources of possible effective emittance growth
are considered in the design of the pre-stripper section and a tolerance budget is established. Numerical beam dynamics studies
include realistic electric and magnetic three-dimensional field distributions in the SC rf cavities and SC solenoids. Error
effects in the longitudinal beam parameters are studied. |
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Keywords: | Superconducting LINAC heavy-ions |
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