AI 中文总结
研究利用紧凑型激光等离子体加速器，通过多GeV电子与固体靶相互作用产生μ子束。新实验扩展诊断能力，能单独重建μ子轨迹并测量能量，为基于轨迹的有源源μ子成像提供关键证明，加速相关有源μ子源开发。
AI 中文摘要
近年来，激光等离子体加速器产生μ子束的可能性在加速器应用领域引起了广泛关注。当多GeV电子轰击固体靶时，可通过贝特-海特勒相互作用产生定向多GeVμ子。它们穿透力强，且因激光等离子体加速器的紧凑性，为可部署的有源μ子源提供了途径。劳伦斯伯克利国家实验室的BELLA中心此前已明确探测到多GeV电子束与4米厚电子束卸料器相互作用产生的μ子。现在的新实验扩展了诊断能力，可进行单μ子轨迹重建和能量测量。该装置能单独重建每个μ子轨迹，对于部分事件，可从磁场弯曲角度提取μ子能量，证明了GeV级μ子的产生。这项工作为基于轨迹的有源源μ子成像提供了关键证明，可实现对隐藏或难以接近样本的非侵入式3D密度映射，并将加速基于激光等离子体加速器的有源μ子源的开发，这种源需要紧凑性、可控方向性、低发散度和深穿透力。
英文摘要
Recently, the possibility of LPA-produced muon beams has gained significant interest within the accelerator application community. Directional, multi-GeV muons can be produced via Bethe-Heitler interactions when multi-GeV electrons hit solid targets. They are highly penetrating and, thanks to the compactness of the LPA, offer a path toward a deployable, active muon source. At the BELLA Center of the Lawrence Berkeley National Laboratory, we previously unambiguously detected muons generated during the interaction of multi-GeV electron beams with a 4 meter-thick electron beam dump. A new campaign has now extended our diagnostic capabilities to single-muon trajectory reconstruction and energy measurements. The setup allowed us to individually reconstruct each muon trajectory, defined by us as a muon passing through three detectors used for the reconstruction. For a subset of events, we extracted the muon energy from the magnetic-field bending angle, demonstrating production of GeV-scale muons. This work provides a key demonstration of track-based active-source muography, which enables non-invasive 3D density mapping of concealed or inaccessible samples, and it will accelerate the development of active LPA-based muon sources where compactness, controlled directionality, low divergence, and deep penetration are required.
