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Freddy Gaboriau (LAPLACE, Université de Toulouse, CNRS)9/22/26, 5:00 PMPoster
The negative ion source concept currently under development for the ITER neutral beam injector exhibits several design flaws, notably: (i) plasma asymmetry along the direction parallel to the ion extraction grid, caused by the transverse magnetic configuration inducing an electron drift (Hall current) that is intercepted by one of the lateral walls (Hall effect), [1, 2] and (ii) an excessively...
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Katsuya Hayashi (核融合科学研究所)9/22/26, 5:00 PMPoster
In order to understand the physical mechanisms governing beam convergence, which is a critical issue in negative ion sources, numerical analyses of the extraction region considering surface-production have been conducted. Previous Particle-in-Cell (PIC) simulations have demonstrated that the relationship between surface-produced negative hydrogen ions and the potential structure affects the...
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Mr Zack Watkins (D-Pace)9/22/26, 5:00 PMPoster
An emittance scanner is one of the most valuable diagnostic instruments available to a low-energy beam transport (LEBT) system. D-Pace licensed an Allison-type emittance scanner from TRIUMF and commercialized the design in 2013. Over the course of the subsequent 13 years, the ES-4 emittance scanner has undergone a series of incremental hardware and software upgrades aimed at improving...
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Dean Morris (STFC)9/22/26, 5:00 PMPoster
High current, long pulse H- beams are required for future accelerator applications, such as the Muon Collider or ESS Neutrino Super Beam where the ISIS 2X Penning ion source is a contender. The 2X source has demonstrated 75mA H- beam, 2ms pulse length, at 50Hz repetition rate on a dedicated test stand, and up to 150mA current at shorter pulse length. However, efficient transport of the beam...
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Takanori Shibata (J-PARC/KEK/NIFS)9/22/26, 5:00 PMPoster
Origin of negative hydrogen ($\text{H}^-$) ion beam parameter oscillation in J-PARC Radio Frequency (RF) -driven $\text{H}^-$ ion source is investigated by direct comparison between experiments and Particle-In-Cell (PIC) simulation. The bias voltage in the range from -100 to +100 V is applied between the extraction electrode (EE) and the plasma electrode (PE) under the RF plasma operation with...
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Anand George (D-Pace)9/22/26, 5:00 PMPoster
D-Pace is investigating the development of a 13.56 MHz RF-driven ion source for the production of negative ion beams. The ion source employs a hybrid design that combines features of the TRIUMF-licensed filament ion source and the RADIS ion source licensed from the University of Jyväskylä. The present work focuses on experimental studies aimed at improving the long-term beam current stability...
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Katsuhiro Shinto (J-PARC center / Japan Atomic Energy Agency (J-PARC/JAEA))9/22/26, 5:00 PMPoster
It has been over a decade since J-PARC initiated negative hydrogen ion beam (H$^-$ beam) supply from its high-intensity radiofrequency-driven H$^-$ ion source in the autumn of 2014. It is noteworthy that there have been virtually no major incidents to date, with only three instances of operational shutdowns and replacement work due to damage to the antenna coils. The operation of the ion...
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William Davis (Dept. of Physics & Engineering Physics, University of Saskatchewan)9/22/26, 5:00 PMPoster
Plasma Immersion Ion Implantation (PIII) is a high-fluence ion implantation technique well-suited for implanting large area and non-planar metallic and semiconducting targets [1-4]. The PIII system developed in the Bradley lab at the University of Saskatchewan (USask) is an ICP system in a bell-jar configuration [5] optimized for semiconductor and photonic device processing. One key advantage...
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Charles Rohde (Los Alamos National Laboratory)9/22/26, 5:00 PMPoster
We present the results from a recently installed laser wire scanner for the H- beam at the Los Alamos Neutron Science Center (LANSCE) in the low energy beam transport (LEBT) section. The presented design is modular, supports orthogonal transverse input laser beam orientations, and acts as a test stand for implementing photodetachment measurements. A custom-built laser interaction point and...
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Mr Laurenz Widermann (TU Dresden, HZDR)9/22/26, 5:00 PMPoster
The Helmholtz Accelerator Mass Spectrometer Tracing Environmental Radionuclides (HAMSTER) facility [1] covers a wide range of applications from the environment to nuclear astrophysics.
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For AMS, negative ions are extracted from a Rb or Cs sputter source and trace amounts of radionuclides are counted in a particle detector. A main limitation is the interference from stable isobars. Such... -
rebekka nagy (University of Jyväskylä)9/22/26, 5:00 PMPoster
A permanent-magnet-based, microwave-driven helium ion source for the production of 1 mA positive beam and 20 µA negative beam via charge exchange is under development. Electron-trajectory simulations have been carried out to investigate a discharge phenomenon observed in the extraction system. The simulations revealed the formation of a charge trap caused by the topology of the...
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Ken Franzen (TAE Technologies)9/22/26, 5:00 PMPoster
The planned Da Vinci Field-Reversed Configuration fusion reactor will require several Neutral Beam Injectors each delivering 1 MeV 5 MW continuous neutral beams. A considered design option includes a spatially separated H- ion source and an electrostatic accelerator as was previously proposed [1].
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Here the status of the numerical analysis work supporting the ongoing design efforts is... -
Jonathan Doyle (Selkirk Innovates)9/22/26, 5:00 PMPoster
Optical emission spectroscopy for measuring electron temperature and density in a Penning ion-source test stand for the production of negative hydrogen ions
Authors
J. Doyle$^{1,2}$, G. Fubiani$^{3}$, C. Xiao$^{1}$, L. Couedel$^{1}$, M. Dehnel$^{1,2,3}$.Affiliations
- University of Saskatchewan — Department of Physics and Engineering Physics
- Selkirk Ion-source...
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Mr Tetsunori Otsubo (Keio University)9/22/26, 5:00 PMPoster
The multi-cusp magnetic field is widely used to improve plasma confinement in high-current negative ion sources for neutral beam injection (NBI) systems in fusion devices. Since confinement performance is affected by the plasma potential and magnetized sheath structure, understanding potential formation and particle loss processes in cusp magnetic fields is important. However, these mechanisms...
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Dr Madison Howard (Los Alamos National Laboratory)9/22/26, 5:00 PMPoster
The LANSCE Accelerator Modernization Project (LAMP) will replace the front-end of the existing LANSCE accelerator, from ion sources through the end of the 100-MeV drift-tube linac. LAMP requires higher peak H- beam currents, and longer lifetimes, than provided by the existing LANSCE H- ion sources. The project has constructed an SNS-style multicusp cesiated source with an internal RF antenna....
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Anna Alexander9/22/26, 5:00 PMPoster
The LANSCE Accelerator Modernization Project (LAMP) will replace the front-end of the existing LANSCE accelerator, from ion sources through the end of the 100-MeV drift-tube linac. This work will describe the H- ion source and injector requirements for LAMP. It will also describe plans for and progress towards the commissioning and testing of the LAMP H- ion testing, as well as various test...
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Jeisson Vanegas (PhD student)9/22/26, 5:00 PMPoster
The University of Saskatchewan Dense Plasma Focus (USASK-DPF) device is currently being optimized as a pulsed ion source for future plasma–wall interaction and material damage studies. USASK-DPF is a Mather-type dense plasma focus device consisting of a coaxial electrode arrangement enclosed in a low-pressure gas chamber and driven by the rapid discharge of a capacitor bank. During operation,...
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