Open AccessNew Commissioning Results of the MIST-1 Multicusp Ion Source
Author(s) -
Daniel Winklehner,
J. M. Conrad,
Joseph Smolsky,
Loyd Waites,
Philip Weigel
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2244/1/012013
Subject(s) - cyclotron , thermal emittance , ion source , beam (structure) , physics , nuclear physics , particle accelerator , ion , proton , ion beam , atomic physics , faraday cup , nuclear engineering , optics , plasma , quantum mechanics , engineering
For the sterile neutrino experiment IsoDAR (Isotope Decay-At-Rest), we have developed a compact particle accelerator system delivering a 10 mA, continuous wave (cw) proton beam at 60 MeV to a neutrino production target. The accelerator comprises a compact isochronous cyclotron, an RFQ embedded in the cyclotron yoke, and an ion source. To reduce space charge effects during injection and acceleration, we are accelerating H + 2 instead of protons. To produce the needed cw H + 2 beam current of 10 mA (nominal) at the required purity and quality, we have built a new filament driven, multicusp ion source (MIST-1). Here we report commissioning results for long-time running at reduced power, demonstrating the feasibility of the design. Highlights include an H + 2 beam current density of ≈ 10 mA/cm 2 , ≈ 80% H + 2 fraction, and extrapolated emittances of 0.05 π-mm-mrad (RMS, normalized) after extraction. We also present high fidelity simulations that are in good qualitative and quantitative agreement with emittance measurements in our test beam line.