Systematic experimental study of space-charge-induced beam instability in next-generation hadron accelerators using a compact ion-trap system

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03662
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hiroshima University
• Principal Investigator: Okamoto Hiromi 広島大学, 先端物質科学研究科, 教授 (40211809)
• Co-Investigator(Kenkyū-buntansha): 伊藤 清一 広島大学, 先端物質科学研究科, 助教 (70335719)
• Co-Investigator(Renkei-kenkyūsha): HOTCHI Hideaki 日本原子力研究開発機構, 原子力化学研究部門, 副主任研究員 (00391334)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 加速器 / 荷電粒子ビーム / イオントラップ / 空間電荷効果 / 集団的ビーム不安定性 / 非線形共鳴

Outline of Final Research Achievements

A systematic experimental study is made of the so-called “space-charge effects” induced by the strong Coulomb self-field potential of an intense hadron beam in a next-generation accelerator. The unique ion-trap apparatus “S-POD” (Simulator of Particle Orbit Dynamics) developed at Hiroshima University is employed for this purpose. S-POD provides a many-body dynamical system (non-neutral plasma) physically equivalent to a relativistic charged-particle beam and thus enables us to explore various space-charge effects in a local tabletop environment. We have clarified the fundamental mechanism and parameter-dependence of coherent resonance instability driven by the space-charge potential and by weak imperfection fields. A prototype of a multipole ion trap has also been designed and constructed for the future study of beam stability under the influence of strong external nonlinearities.

Free Research Field

数物系科学