Conical targets for enhanced high-current positron sources

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-09-11 DOI:10.1016/j.nimb.2025.165854

Nicolas Vallis , Ramiro Mena-Andrade , Barbara Humann , Yongke Zhao , Paolo Craievich , Jean-Louis Grenard , Andrea Latina , Anton Lechner , Antonio Perillo-Marcone , Riccardo Zennaro , Fahad Alharthi , Iryna Chaikovska , Robert Chehab , Mike Seidel

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引用次数: 0

Abstract

Previous positron source designs have assumed that the converter target is significantly wider than the secondary beam size. This paper investigates targets with different transverse profiles to enhance positron production. Starting from the concept of wire-targets (James et al., 1991) proposed in 1991 for the former SLC positron source, we introduce conical-shaped targets to improve the yield by reducing positron reabsorption—an issue exacerbated by high-field solenoid lenses typically used for positron capture. Using Geant4 simulations, we propose new conical targets adapted for the future FCC-ee and its positron test facility P³ (PSI Positron Production experiment) at the Paul Scherrer Institute. Results indicate that conical targets can nearly double the positron production at the target and boost FCC-ee’s positron yield by approximately 60%. Additionally, we present thermo-mechanical studies for the conical targets under FCC-ee’s primary beam power parameters, and outline the mechanical implementation for a proof-of-principle demonstration at the P³ facility.

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增强大电流正电子源的锥形靶

以前的正电子源设计假设变换器目标比二次光束尺寸宽得多。本文研究了采用不同横截面的靶材来增强正电子的产生。从1991年针对前SLC正电子源提出的线靶概念（James et al., 1991）开始，我们引入锥形靶，通过减少正电子的再吸收来提高产量——通常用于正电子捕获的高场螺线管透镜加剧了这一问题。利用Geant4模拟，我们提出了适用于未来FCC-ee及其在Paul Scherrer研究所的正电子测试设施P3 （PSI正电子产生实验）的新锥形靶。结果表明，锥形靶可以使靶处的正电子产量增加近一倍，并使FCC-ee的正电子产量提高约60%。此外，我们在FCC-ee的主光束功率参数下对锥形目标进行了热机械研究，并概述了在P3设施进行原理验证演示的机械实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.