Injection and confinement of positron bunches in a magnetic dipole trap

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
A. Deller, J. von der Linden, S. Nißl, K. Michishio, N. Oshima, H. Higaki, E. Stenson
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Abstract

We demonstrate the efficient injection of a pulsed positron beam into a magnetic dipole trap and investigate the ensuing particle dynamics in the inhomogeneous electric and magnetic fields. Bunches of ∼105e+ were transferred from a buffer-gas trap into the field of a permanent magnet using a lossless E×B drift technique. The Δt≈0.2µs pulses were short compared to the toroidal rotation period, τd≈16µs, and e+ confinement time, τc≈0.6 s. The redistribution dynamics were studied by measuring the delayed γ-ray emission as the trap was emptied. This work extends the record for the number of low-energy positrons held in a dipole trap by two orders of magnitude and represents a significant advance toward the confinement of an electron-positron pair plasma. Published by the American Physical Society 2024

Abstract Image

正电子束在磁偶极阱中的注入和束缚
我们展示了将脉冲正电子束高效注入磁偶极子阱的过程,并研究了不均匀电场和磁场中的粒子动力学。利用无损 E×B 漂移技术,将一束束 ∼105e+从缓冲气阱转移到永久磁铁的磁场中。与环形旋转周期τd≈16µs和e+禁锢时间τc≈0.6 s相比,Δt≈0.2µs脉冲时间很短。这项工作将偶极阱中容纳低能正电子的数量记录扩大了两个数量级,标志着在约束电子-正电子对等离子体方面取得了重大进展。 美国物理学会出版 2024
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
期刊介绍: ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.
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