dorsal/arxiv
View SchemaHeavy-Ion Beam Acceleration of Two-Charge States from an Ecr Ion Source
| Authors | P. N. Ostroumov, K. W. Shepard, V. N. Aseev, A. A. Kolomiets |
|---|---|
| Categories | |
| ArXiv ID | physics/0008184 |
| URL | https://arxiv.org/abs/physics/0008184 |
| Journal | eConf C000821 (2000) MOD01 |
Abstract
This paper describes a design for the front end of a superconducting (SC) ion linac which can accept and simultaneously accelerate two charge states of uranium from an ECR ion source. This mode of operation increases the beam current available for the heaviest ions by a factor of two. We discuss the 12 MeV/u prestripper section of the Rare Isotope Accelerator (RIA) driver linac including the LEBT, RFQ, MEBT and SC sections, with a total voltage of 112 MV. The LEBT consists of two bunchers and electrostatic quadrupoles. The fundamental frequency of both bunchers is half of the RFQ frequency. The first buncher is a multiharmonic buncher, designed to accept more than 80% of each charge state and to form bunches of extremely low longitudinal emittance (rms emittance is lower than 0.2 keV/u nsec) at the output of the RFQ. The second buncher is located directly in front of the RFQ and matches the velocity of each charge-state bunch to the design input velocity of the RFQ. We present full 3D simulations of a two-charge-state uranium beam including space charge forces in the LEBT and RFQ, realistic distributions of all electric and magnetic fields along the whole prestripper linac, and the effects of errors, evaluated for several design options for the prestripper linac. The results indicate that it is possible to accelerate two charge states while keeping emittance growth within tolerable limits.
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"abstract": "This paper describes a design for the front end of a superconducting (SC) ion\nlinac which can accept and simultaneously accelerate two charge states of\nuranium from an ECR ion source. This mode of operation increases the beam\ncurrent available for the heaviest ions by a factor of two. We discuss the 12\nMeV/u prestripper section of the Rare Isotope Accelerator (RIA) driver linac\nincluding the LEBT, RFQ, MEBT and SC sections, with a total voltage of 112 MV.\nThe LEBT consists of two bunchers and electrostatic quadrupoles. The\nfundamental frequency of both bunchers is half of the RFQ frequency. The first\nbuncher is a multiharmonic buncher, designed to accept more than 80% of each\ncharge state and to form bunches of extremely low longitudinal emittance (rms\nemittance is lower than 0.2 keV/u nsec) at the output of the RFQ. The second\nbuncher is located directly in front of the RFQ and matches the velocity of\neach charge-state bunch to the design input velocity of the RFQ. We present\nfull 3D simulations of a two-charge-state uranium beam including space charge\nforces in the LEBT and RFQ, realistic distributions of all electric and\nmagnetic fields along the whole prestripper linac, and the effects of errors,\nevaluated for several design options for the prestripper linac. The results\nindicate that it is possible to accelerate two charge states while keeping\nemittance growth within tolerable limits.",
"arxiv_id": "physics/0008184",
"authors": [
"P. N. Ostroumov",
"K. W. Shepard",
"V. N. Aseev",
"A. A. Kolomiets"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C000821 (2000) MOD01",
"title": "Heavy-Ion Beam Acceleration of Two-Charge States from an Ecr Ion Source",
"url": "https://arxiv.org/abs/physics/0008184"
},
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