International Conference on Ion Sources (ICIS2021)

New Commissioning Results of the MIST-1 Multicusp Ion Source

20 Sept 2021, 06:00

20m

Parallel Session (Contributed Oral) talk Production of high intensity ion beams

Speaker

Dr Daniel Winklehner (Massachusetts Institute of Technology)

Description

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 H₂⁺ instead of protons. To produce the needed cw H₂⁺ 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 H₂⁺ beam current density of 12 mA/cm², > 80 % H₂⁺ fraction, and 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.

Presentation materials

ICIS21_MIST-1_Recording.mp4

ICIS21_MIST-1_Slides.pdf