High-current H beams from a filament-driven multicusp ion source.

We report the results from a new multicusp ion source (MIST-1) that produces record steady-state currents of H (1 mA) from this type of ion source with high purity (80% H ). We built MIST-1 to fulfill the stringent beam purity and beam quality requirements for IsoDAR, a proposed discovery-level neutrino experiment, requiring a 10 mA, 60 MeV/amu continuous wave (cw) proton beam on the target. IsoDAR will use a cyclotron accelerating H ions and using a novel radio frequency quadrupole (RFQ) direct injection method.

First Results from ABRACADABRA-10 cm: A Search for Sub-μeV Axion Dark Matter.

The axion is a promising dark matter candidate, which was originally proposed to solve the strong-CP problem in particle physics. To date, the available parameter space for axion and axionlike particle dark matter is relatively unexplored, particularly at masses m_{a}≲1  μeV. ABRACADABRA is a new experimental program to search for axion dark matter over a broad range of masses, 10^{-12}≲m_{a}≲10^{-6}  eV.

Preliminary design of a RFQ direct injection scheme for the IsoDAR high intensity H₂⁺ cyclotron.

IsoDAR (Isotope Decay-At-Rest) is a novel experiment designed to measure neutrino oscillations through ν̄(e) disappearance, thus providing a definitive search for sterile neutrinos. In order to generate the necessary anti-neutrino flux, a high intensity primary proton beam is needed. In IsoDAR, H2(+) is accelerated and is stripped into protons just before the target, to overcome space charge issues at injection.

A high intensity H₂⁺ multicusp ion source for the isotope decay-at-rest experiment, IsoDAR.

The Isotope Decay-At-Rest (IsoDAR) experimental program aims to decisively test the sterile neutrino hypothesis. In essence, it is a novel cyclotron based neutrino factory that will improve the frontiers in both high-intensity cyclotrons and electron flavor anti-neutrino sources. By using a source in which the usual H(-) ions are replaced with the more tightly bound H2(+) ions, we can negate the effects of Lorentz stripping in a cyclotron, reduce the overall perveance due to the space-charge effect, and deliver twice the number of protons per nuclei on target.

Characterization of the Catania VIS for H2(+).

The Catania VIS 2.46 GHz source has been installed on a test stand at the Best Cyclotron Systems, in Vancouver, Canada, as part of the DAEδALUS and IsoDAR R&D program. Studies to date include optimization for H2 (+)/p ratio and emittance measurements.

Space-charge compensation measurements in electron cyclotron resonance ion source low energy beam transport lines with a retarding field analyzer.

In this paper we describe the first systematic measurement of beam neutralization (space charge compensation) in the ECR low energy transport line with a retarding field analyzer, which can be used to measure the potential of the beam. Expected trends for the space charge compensation levels such as increase with residual gas pressure, beam current, and beam density could be observed. However, the overall levels of neutralization are consistently low (<60%).

Progress towards the development of a realistic electron cyclotron resonance ion source extraction model.

In this paper, an ongoing effort to provide a simulation and design tool for electron cyclotron resonance ion source extraction and low energy beam transport is described and benchmarked against experimental results. Utilizing the particle-in-cell code WARP, a set of scripts has been developed: A semiempirical method of generating initial conditions, a 2D-3D hybrid method of plasma extraction and a simple beam transport deck. Measured emittances and beam profiles of uranium and helium beams are shown and the influence of the sextupole part of the plasma confinement field is investigated.

Low energy beam transport for facility for rare isotope beams driver linear particle accelerator.

The driver linac for the facility for rare isotope beams (FRIB) will provide a wide range of primary ion beams for nuclear physics research. The linac will be capable of accelerating a uranium beam to an energy of up to 200 Mev∕u and delivering it to a fragmentation target with a maximum power of 400 kW. Stable ion beams will be produced by a high performance electron cyclotron resonance ion source operating at 28 GHz.