Technical Design of an RFQ Injector for the IsoDAR Cyclotron

Höltermann, Holger; Conrad, J. M.; Koser, Daniel; Koubek, Benjamin; Podlech, Holger; Ratzinger, U.; Schuett, Maximilian; Smolsky, Joseph; Syha, Marc; Waites, Loyd; Winklehner, Daniel

doi:10.18429/jacow-ipac2021-thpab167

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“…The 10 mA proton beam is obtained from an isochronous cyclotron that will accelerate + H 2 ions to the full energy of 60 MeV/amu, operating in continuous wave (CW) mode [5,17,18]. The beam will be produced by a reliable, high-intensity multicusp ion source [19] and then injected into the cyclotron through a compact low energy beam transport line (LEBT) and a novel radio-frequency quadrupole (RFQ) buncher [20,21], partially embedded in the cyclotron yoke. The beam is then guided through a spiral inflector that directs the beam from its axial direction into the median plane of the cyclotron.…”

Section: Introductionmentioning

confidence: 99%

Analyzing beam-gas interactions in an H2+ cyclotron beam

Calvo,

Winklehner,

Oliver

2023

J. Phys. G: Nucl. Part. Phys.

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For the Isotope Decay At Rest (IsoDAR) experiment in neutrino physics (searching for sterile neutrinos), we have developed a novel compact isochronous cyclotron with direct injection through an axially embedded RFQ. For IsoDAR to be decisive within five years of running, 10 mA of protons, cw at 80 % duty factor are needed on a neutrino production target. To alleviate space charge in the cyclotron driver, we accelerate 5 mA of H+2, to be broken up into 10 mA of protons after extraction from the cyclotron. An open question that we are answering with this paper is whether the beam losses from gas-stripping (the removal of electrons from H+2 through the interaction of the beam ions with the residual gas in the accelerator) are going to be a significant challenge. Using a newly added feature to the wellestablished OPAL code, we calculate Lorentz stripping and gas-stripping losses in the IsoDAR cyclotron using realistic beam distributions, magnetic fields, gas composition, and pressure. We show that to maintain losses due to dissociation below 1 % over the entire acceleration region, a vacuum of at least 6·10−7 mbar is required.

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