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Dr Shubham Singh Baghel (Institut National de la Recherche Scientifique -Énergie Matériaux, Télécommunications)9/21/26, 5:00 PMPoster
Tandem accelerators require negative helium He- ions for efficient two-stage acceleration. Currently, He- is produced via charge exchange in alkali metal vapor [1]. This method causes severe issues: downstream contamination, disastrous for semiconductor applications, high-voltage sparking, and hazardous maintenance [2]. We propose transitioning to an alkali-free, volume production method...
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Connor MacKenzie (Selkirk Ion Source Research Center)9/21/26, 5:00 PMPoster
Commissioning of a Penning Ion Source Test Stand and Negative Hydrogen Ion Experiments for Medical Applications
Authors
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R. Gagnon$^{2,4,7}$, C. MacKenzie$^{1,2}$, B. Warfield$^{2,3,5}$, J. Doyle$^{1,2}$, S. Spence$^{2}$, M. Morissette$^{2}$,C. Kent$^{2}$, J. Cramton$^{2}$, C. Drew$^{2}$, J. Taylor$^{2}$, T. Junginger$^{3,5}$, S. Tekumalla$^{4}$, N. Savard$^{7}$,A. George$^{7}$, C.... -
Jasmin Deguire (D-Pace, University of Victoria)9/21/26, 5:00 PMPoster
We present LePIC+, a new generation Particle-in-Cell code developed from the legacy LePIC code and designed to improve maintainability, scalability, and computational efficiency while preserving the physical fidelity of the original implementation. LePIC+ introduces a fully modernized architecture based on improved memory management and a modular code design. Particular attention was given to...
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Yuya Inokuchi (Doshisha. University)9/21/26, 5:00 PMPoster
Negative hydrogen (H$^{-}$) ion production on cesiated metal surfaces is a key process for high-intensity H$^{-}$ ion sources for neutral beam injection systems. Electron transfer from a low-work-function surface to an incident hydrogen atom produces H$^{-}$ ions$^{*}$ near an extraction hole. Semi-continuous Cs supply maintains the low-work-function of the plasma grid (PG)$^{**}$, while...
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Connor MacKenzie (Selkirk Ion Source Research Center)9/21/26, 5:00 PMPoster
C. MacKenzie$^{1,2}$, J. Deguire$^5$, V. Laporta$^4$, M. Bradley$^1$, G. Fubiani$^3$, L. Couedel$^1$, M. Dehnel$^{1,2,5,6}$.
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[1] University of Saskatchewan, Department of Physics and Engineering Physics
[2] Selkirk Ion-source Research Centre (SIRC)
[3] LAPLACE, Université de Toulouse, CNRS
[4] CNR-ISTP
[5] D-Pace, Inc.
[6] Accel-Link Ltd.
Efficient negative hydrogen ion (H⁻) sources... -
Anna Alexander9/21/26, 5:00 PMPoster
LANSCE uses a filament driven multi-cusp H- ion source. Most H- ions are produced on a biased, low work function converter. The surface chemistry and work function are complex due to the time dynamics of the pulsed plasma, and the wide variety of elements/molecules that are present and participate in the surface formation. This work will use basic models and existing LANSCE ion source and...
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Portia Switzer (University of Saskatchewan)9/21/26, 5:00 PMPoster
Langmuir probes are a well-established and commonly used method for the characterization of plasmas. Basic Langmuir probe measurements focus on electron and positive ion currents while ignoring the possibility of negative ions; however, with certain assumptions, the analysis of the resultant curves can extend to negative ions. Microwave plasmas are important tools for thin film deposition with...
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Takaaki Ishikawa9/21/26, 5:00 PMPoster
In the ITER neutral beam injection (NBI) system, a radiofrequency (RF) negative hydrogen ion source is used to heat the core plasma. However, the current RF ion source has not yet achieved the required beam divergence angle (7 mrad), which remains a major challenge. For the RF negative hydrogen ion source at J-PARC, a large-scale accelerator, the beam distribution has been observed to...
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Hayato Soejima (Keio-University)9/21/26, 5:00 PMPoster
In the Research and Development Negative Ion Source (RNIS) at NIFS, it has been reported that switching the operational gas from hydrogen (H) to deuterium (D) leads to an approximate threefold increase in electron density [1].
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In previous studies [2,3], hydrogen isotope effects were investigated using a three-dimensional kinetic electron transport code, KEIO-MARC, together with a... -
Naomi Kawamura (Keio University)9/21/26, 5:00 PMPoster
Beam oscillation has been observed in radio-frequency negative hydrogen ion sources (e.g., Ref. [1]). Recently, the oscillation has been investigated using an electrostatic Particle-in-Cell (PIC) simulation, and the behavior resulted from oscillations in the source plasma density [2]. In the simulation, it was assumed that the source plasma in the driver region periodically oscillates, while...
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Vladislav Vekselman (TAE Technologies)9/21/26, 5:00 PMPoster
A compact, cesium-free negative hydrogen ion source based on D-Pace hardware has been deployed in a boron neutron capture therapy (BNCT) accelerator at TAE Life Sciences. The cesium-free design fits a medical-accelerator environment well. It avoids the contamination and maintenance burden of cesiated surface-conversion sources, while still meeting the required current and duty cycle. The...
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Ben Warfield (University of Victoria)9/21/26, 5:00 PMPoster
In Penning ion source design the puller electrostatic lens, nominally biased at ±15 kV for
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the SIRC test stand, is offset from the plane of initial beam extraction from the plasma
chamber’s anode aperture centreline in order to account for the Lorentz force imparted
by the dipole magnetic field. A study of how this offset can be optimized to limit beam
loss and increase acceptance is done... -
Dr Chen Zuo (Huazhong University of Science and Technology)9/21/26, 5:00 PMPoster
Space charge compensation (SCC) is a key process in negative-ion beam transport, because ionization of the residual gas generates secondary charges that can partially or even overcompensate the beam space charge and thereby modify beam transport. Previous studies have shown that the compensation state depends on background-gas conditions, secondary-particle production and loss, and, in...
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Mike RIGG (ISIS STFC)9/21/26, 5:00 PMPoster
Electronic hardware for beam chopping 655kV H- beam at ISIS.
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Robert Abel (STFC)9/21/26, 5:00 PMPoster
An RF-driven long-lifetime H- ion source operating at 50 Hz with 1.5% duty factor and 35 keV beam energy is currently under development for the ISIS Neutron and Muon Source at Rutherford Appleton Laboratory. The new ion source is designed operate with an upgraded medium energy beam transport (MEBT) that will provide improved transport efficiency and reduced beam losses. This paper will give an...
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April Smith (Los Alamos National Laboratory)9/21/26, 5:00 PMPoster
At the Los Alamos Neutron Science Center (LANSCE), the LANSCE Accelerator Modernization Project (LAMP) aims to replace the aging front-end, including the H- ion source. The new H- source, based on the RF ion source at SNS, uses a low work function surface for H- ion production, necessary for achieving higher H- current densities. This paper describes simulations and results from a...
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Suresh Saminathan (TRIUMF)9/21/26, 5:00 PMPoster
The demand for extracted beams from TRIUMF's 500 MeV cyclotron is growing with the addition of ARIEL, its new advanced rare isotope beam facility. To meet these intensity requirements, an upgrade program has been initiated for the injection system. The program involves installing a new injection beamline and an additional ion source to enable high-brightness, intense beam injection....
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Dr Huihui hong, Yuanlai Xie9/21/26, 5:00 PMPoster
As magnetic confinement fusion advances toward power generation, neutral beam injection (NBI) auxiliary heating faces increasingly stringent demands for higher energy, current density, and pulse duration. Ion beam neutralization—the most critical step in NBI—currently relies on the gas target method, where ions collide with homogeneously injected gas to produce neutrals. While raising the gas...
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Sydney Spence (Selkirk Ion-source Research Centre)9/21/26, 5:00 PMPoster
S. Spence1, C. MacKenzie1,2, R. Gagnon1,4, B. Warfield1,3, M. Morissette1, M. Dehnel1,3
- Selkirk Ion-source Research Centre (SIRC)
- University of Saskatchewan, Department of Physics and Engineering Physics
- University of Victoria, Department of Physics and Astronomy
- University of Victoria, Department of Mechanical...
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