Design of a high power production target for the Beam Dump Facility at CERN
E. Lopez Sola, M. Calviani, P. Avigni, M. Battistin, J. Busom Descarrega, J. Canhoto Espadanal, M. A. Fraser, S. Gilardoni, B. Goddard, D. Grenier, R. Jacobsson… 展开作者
E. Lopez Sola, M. Calviani, P. Avigni, M. Battistin, J. Busom Descarrega, J. Canhoto Espadanal, M. A. Fraser, S. Gilardoni, B. Goddard, D. Grenier, R. Jacobsson, K. Kershaw, M. Lamont, A. Perillo-Marcone, M. Pandey, B. Riffaud, S. Sgobba, V. Vlachoudis, L. Zuccalli
The Beam Dump Facility (BDF) project is a proposed general-purpose facility at CERN, dedicated to beam dump and fixed target experiments. In its initial phase, the facility is foreseen to be exploited by the Search for Hidden Particles (SHiP) experiment. Physics requirements call for a pulsed 400 GeV/c proton beam as well as the highest possible number of protons on target (POT) each year of operation, in order to search for feebly interacting particles. The target/dump assembly lies at the heart of the facility, with the aim of safely absorbing the full high intensity Super Proton Synchrotron (SPS) beam, while maximizing the production of charmed and beauty mesons. High-Z materials are required for the target/dump, in order to have the shortest possible absorber and reduce muon background for the downstream experiment. The high average power deposited on target (305 kW) creates a challenge for heat removal. During the BDF facility Comprehensive Design Study (CDS), launched by CERN in 2016, extensive studies have been carried out in order to define and assess the target assembly design. These studies are described in the present contribution, which details the proposed design of the BDF production target, as well as the material selection process and the optimization of the target configuration and beam dilution. One of the specific challenges and novelty of this work is the need to consider new target materials, such as a molybdenum alloy (TZM) as core absorbing material and Ta2.5W as cladding. Thermo-structural and fluid dynamics calculations have been performed to evaluate the reliability of the target and its cooling system under beam operation. In the framework of the target comprehensive design, a preliminary mechanical design of the full target assembly has also been carried out, assessing the feasibility of the whole target system.
Hot Isostatic Pressing (HIP) assisted diffusion bonding between CuCr1Zr and AISI 316L for application to the Super Proton Synchrotron (SPS) internal beam dump at CERN
Modeling Light Signals Using Data from the First Pulsed Neutron Source Program at the DUNE Vertical Drift ColdBox Test Facility at CERN Neutrino Platform
Fermi National Accelerator Laboratory（费米国家加速器实验室）；Stony Brook University, SUNY（石溪大学，纽约州立大学）；South Dakota School of Mines and Technology（南达科他矿业和理工学院）；CERN（欧洲核子研究中心）；Tel Aviv University（特拉维夫大学）；University of Milano-Bicocca（米兰比可卡大学）；Argonne National Laboratory（阿贡国家实验室）；Colorado State University（科罗拉多州立大学）；Laboratoire d’Annecy-le-Vieux de Physique des Particules（昂纳西勒沃粒子物理实验室）；Università degli Studi di Milano（米兰大学）；University of California Davis（加州大学戴维斯分校）；Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）；University of Minnesota Twin Cities（明尼苏达大学双城分校）
Design development and implementation of an irradiation station at the neutron time-of-flight facility at CERN
一个新的寄生式、混合场、中子为主的辐照站最近已在欧洲粒子物理实验室（CERN）投入使用。该站安装在中子飞行时间设施中，利用中子散射靶产生的二次辐射。新的台站允许在更接近于粒子加速器运行期间所遇到的辐照条件下进行辐射损害研究;在台站进行的辐照试验将补充通常用伽马源进行的材料标准试验。样品将每年暴露于MGy范围内的中子剂量，对n TOF设施运行的影响最小。该工作站有24个辐照位置，每个位置可容纳多达100 cm 3的样品材料。鉴于其接近nTOF靶，在保护屏蔽内，考虑到人员的安全并避免对nTOF设施和实验的操作产生任何不必要的影响，已经仔细地开发了辐照站及其操作程序。由于nTOF靶周围的整个区域和辐照样品的残留放射性，即使当nTOF设施不运行时，也禁止人类操作员进入辐照站。机器人用于远程安装和取回样品，并根据辐射防护条例和最大限度地减少人员剂量的目的，对处理程序进行了其他优化。
High-resolution tracking in a GEM-Emulsion detector
SHiP（Search for Hidden Particles）是欧洲核子研究中心（CERN）提出的一项束流收集实验，旨在观察与普通物质非常弱耦合的长寿命粒子，这些粒子主要产生于粲强子的衰变。SHiP的束流收集设施也是所有三种中微子的丰富工厂，因此在SHiP设备中预见了专用的中微子探测器。中微子探测器利用乳胶云室技术，采用模块化结构，交替使用目标单元的墙壁和电子探测器的平面，为事件提供时间戳。GEM探测器是这项任务的可能选择之一。本文报道了一种新型混合室在CERN的首次μ子束曝光的结果，这种混合室是由GEM室和乳胶探测器耦合而成的。由于乳胶检测器的测微精度，在有和没有磁场的两种配置中评估了GEM室的位置分辨率作为颗粒倾斜度的函数
欧洲核子研究中心建造了一个高强度超子束，将Sigma-输送到欧米茄设施的实验WA 89，并于1989年至1994年运行。该装置允许在超子和常规强子束配置之间快速转换。在平均动量为330 ~ 345 Gev/c的情况下，该束流提供了1.4 x 10^5/次爆发的西格玛通量，由约3 x 10^10个450 GeV/c的质子产生。在实验目标处，光束的σ/π比接近0.4，尺寸为1.6 x 3.7 cm ^2。在束流通道中用光纤描迹仪测量束粒子的轨迹和动量，在通道出口处用硅微带探测器测量束粒子的轨迹和动量。利用快速跃迁辐射探测器对光束的π分量进行了识别。
Technical Proposal for the Atom Interferometer CERN Experiment (AICE) Facility
CERN（欧洲核子研究组织）；German Aerospace Center (DLR), Institute of Quantum Technologies（德国航空航天中心（DLR）量子技术研究所）；Rutherford Appleton Laboratory, UKRI-STFC（卢瑟福·阿普尔顿实验室，英国研究与创新署-科学和技术设施委员会）；High Energy Physics Group, Blackett Laboratory, Imperial College（帝国理工学院布莱克特实验室高能物理组）；IOGS, LP2N, Université Bordeaux, CNRS, UMR 5298（高等光学研究生院，LP2N，波尔多大学，法国国家科学研究中心，联合研究单位5298）；Gravitation Astroparticle Physics Amsterdam (GRAPPA), University of Amsterdam（阿姆斯特丹引力天体粒子物理学（GRAPPA），阿姆斯特丹大学）；Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology（高能物理研究所（IFAE），巴塞罗那科学技术研究院）；Institució Catalana de Recerca i Estudis Avançats (ICREA)（加泰罗尼亚研究高级学院（ICREA））；Department of Physics, University of Oxford（牛津大学物理系）；Department of Physics & Astronomy, University College London（伦敦大学学院物理与天文系）
