3 papers
physics.plasm-ph2026
Overcoming the space-charge dilemma in low-energy heavy ion beams via a multistage acceleration lens system
M. Nishiura, T. Ido, M. Okamura +3
Low-energy heavy-ion beams are fundamentally limited by severe space-charge divergence, which constrains the transportable beam current to a few microamperes in conventional electr…
physics.plasm-ph2025
Enhanced beam transport via space charge mitigation in a multistage accelerator for fusion plasma diagnostics
M. Nishiura, K. Nakamura, K. Ueda +5
Efficient transport of high-current negative ion beams is critical for accurate plasma potential diagnostics using heavy-ion beam probe (HIBP) systems in magnetically confined fusi…
physics.acc-ph2025
High performance beam transport with multi-stage acceleration system and its application to plasma potential measurement in fusion plasmas
Kaori Nakamura, Masaki Nishiura, Kenji Ueda +4
In accelerators, ion beams are often accelerated using electrostatic accelerating tubes. This paper reports on a method to improve the beam transport efficiency without adding new…