Advances of the FRIB project

Abstract

The Facility for Rare Isotope Beams (FRIB) Project has entered the phase of beam commissioning starting from the room-temperature front end and the superconducting linac segment of first 15 cryomodules. With the newly commissioned helium refrigeration system supplying 4.5[Formula: see text]K liquid helium to the quarter-wave resonators and solenoids, the FRIB accelerator team achieved the sectional key performance parameters as designed ahead of schedule accelerating heavy ion beams above 20[Formula: see text]MeV/u energy. Thus, FRIB accelerator becomes world’s highest-energy heavy ion linear accelerator. We also validated machine protection and personnel protection systems that will be crucial to the next phase of commissioning. FRIB is on track towards a national user facility at the power frontier with a beam power two orders of magnitude higher than operating heavy-ion facilities. This paper summarizes the status of accelerator design, technology development, construction, commissioning as well as path to operations and upgrades.

Huizhou accelerator complex facility and its future development

“…基于这些束流可以开展多方面的重 要基础物理问题研究, 特别是缪子物理研究 [21] . [24] 、德国FAIR [25] 、日本RIKEN [26] 等, 均投入 大量的人力物力进行基础研究及其相应的高新探测技 术研发, HIAF以及国际上俄罗斯的NICA [27] 、德国的 FAIR和美国RHIC的能量扫描计划 [28] , 将会形成一个 [29,30] .…”

“…利用激光谱技术 还可以测量放射性核素原子的超精细结构以及电子能 级同位素移位(或者同核异能态移位)来提取原子核的 基本性质 [36] , 研究原子核的内禀结构, 是检验和发展 不稳定核区原子核理论的重要依据, 为原子物理精密 谱 学 与 现 代 核 物 理 的 交 叉 研 究 提 供 了 广 阔 的 舞 台 [37][38][39] . [46] ; 实现高流强连续离子 束的最佳技术路线是超导直线加速器, 典型代表是在 建的美国稀有同位素束流装置FRIB [24] ; 实现高束团功 率的最佳方案是级联的环形同步加速器, 逐级提高束 流能量, 逐级累积提高单束团离子数, 典型代表是在 建的我国强流重离子加速器研究装置HIAF和德国反 质子和离子研究装置FAIR [25] . 实现高束流品质的技术 路线是应用各种束流冷却技术如随机冷却、电子冷却 或激光冷却.…”

Beam commissioning in the first superconducting segment of the Facility for Rare Isotope Beams

“…1. Ion beams were accelerated in the shaded fraction of LS1 and folding segment 1 (FS1), which includes 14 accelerating cryomodules, a bunching cryomodule, a set of carbon foils for stripping, a room-temperature IH-type buncher, and two beam dumps (FS1a and FS1b) [1]. Prior to the beam commissioning, all SC cavities were cooled down to 4.5 K and conditioned at accelerating gradients exceeding the design value by 10%.…”

RF deflecting cavity for fast radioactive ion beams

“…Experiments with rare-isotope beams are performed at a wide variety of institutions around the world. Soon, the most powerful such facility in the world, RIBF [3] in Japan, will be joined by two other next-generation facilities, FAIR [4] in Germany and FRIB [5] in the United States.…”