RII Track-4: Development of high-purity Ge detector technology with LBNL for dark matter and neutrino physics

RII Track-4：利用 LBNL 开发用于暗物质和中微子物理的高纯 Ge 探测器技术

• 批准号: 1738695
• 负责人: Jing Liu
• 金额: $ 15.33万
• 依托单位: University of South Dakota Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-15 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1738695&HistoricalAwards=false
• 关键词: RII; Track; Development; purity; Ge

Non-technical DescriptionOur understanding of the origins of the universe and the fundamental nature of matter are linked; however, our knowledge of those subjects is limited by the available instruments and their abilities to detect processes that occur at subatomic levels. The goal of this project is to initiate a long-term collaboration between the University of South Dakota (USD) and the Lawrence-Berkeley National Laboratory (LBNL) to develop novel detector technologies for experiments that aim to solve some of the most difficult questions in nuclear physics and cosmology, such as the true nature of dark matter, and how atomic nuclei are bound together. The proposed project will provide the PI with comprehensive training and experience on advanced detector development, and will establish needed collaborations to further his career. The proposed project also has the potential to establish a partnership between USD and companies that are interested in developing radiation detection technologies for a variety of applications, such as radiation therapy and/or homeland security. Given the increased capacity to develop these advanced detectors, USD may stimulate the interest of local industry in radiation detectors, thereby contributing to local economic development.Technical DescriptionThis collaborative research has two specific objectives: (1) measuring charge carrier drift mobilities in arbitrary directions for better modeling of electronic signal formation in High Purity Germanium (HPGe) detectors; and (2) investigating the possibility of particle identification utilizing ionization signal alone in HPGe detectors. They will be achieved through two years of collaborative development of a series of planar HPGe detectors and a variable temperature cryostat with low-noise front-end electronics by the PI and his graduate student in partnership with the host scientist in LBNL. The knowledge transfer during the collaboration will improve both the HPGe detector development capacity at USD, and the long-term competitiveness of USD in fundamental physics research. Detailed study of mobilities in different directions will lead to better theoretic understanding and numerical modeling of electronic signal formation processes in HPGe detectors, which is essential for signal/background discrimination in neutrinoless double beta (0νββ) decay experiments and for precise γ-ray tracking in nuclear spectroscopy experiments. Recently, a new collaboration, LEGEND, was formed as a merged effort of two state-of-the-art HPGe based 0νββ-decay experiments, GERDA and MJD, to establish a Large Experiment for Ge Neutrinoless double beta Decay search, using HPGe detectors. Both the home and host institutes joined the new collaboration. Their joint effort will help LEGEND obtain HPGe detectors with innovative properties from affiliated academic institutions to improve their sensitivities to 0νββ-decay signals.

非技术描述的理解是对宇宙起源和物质的基本性质的理解；但是，我们对这些受试者的了解受到可用工具的限制及其检测在亚原子水平上发生的过程的能力。该项目的目的是在南达科他大学（USD）与劳伦斯 - 伯克利国家实验室（LBNL）之间进行长期合作，以开发用于实验的新颖探测器技术，以解决旨在解决核物理学和宇宙学中一些最困难的问题的实验，例如黑暗物质和黑暗物质的真实本质，以及如何构成核心的真实性。拟议的项目将为PI提供有关高级探测器开发的全面培训和经验，并将建立所需的合作以促进他的职业生涯。 拟议的项目还有可能建立美元与有兴趣为各种应用程序（例如放射治疗和/或国土安全）开发辐射检测技术的公司之间建立合作伙伴关系。鉴于开发这些高级探测器的能力提高，美元可能会刺激当地工业对辐射探测器的兴趣，从而有助于当地经济发展。技术描述该协作研究具有两个具体的目标：（1）测量荷载载流子在高纯度德国人（HPGE）高透明（HPGE）探测器中更好地建模的指导中的托架漂移移动性，以实现。 （2）研究单独使用HPGE检测器中的电离信号的粒子鉴定的可能性。通过PI和他的研究生与LBNL的主人科学家合作，通过一系列平面HPGE探测器的两年合作开发以及与低噪声前端电子产品的可变温度低温恒温器来实现。合作期间的知识转移将提高USD的HPGE探测器开发能力，以及在基本物理研究中的长期竞争力。 Detailed study of mobilities in different directions will lead to better theoretic understanding and numerical modeling of electronic signal formation processes in HPGe detectors, which is essential for signal/background discrimination in neutrinoless double beta (0νββ) decay experiments and for precise γ-ray tracking in nuclear spectroscopy experiments.最近，建立了一项新的合作，《传奇》，作为两个最先进的HPGE的合并，基于0＆＃957;＆＃946;＆＃946;＆＃946; decay实验，Gerda和MJD，以建立用于使用HPGE DETECTORS的GE Neutmoress Double beta decay搜索的大型实验。家庭和房东机构都加入了新的合作。他们的共同努力将有助于传说获得来自附属学院的创新性能的HPGE探测器，以将其敏感性提高到0＆＃957;＆＃946;＆＃946; decay Signals。

项目成果

Impact of charge trapping on the energy resolution of Ge detectors for rare-event physics searches

• DOI: 10.1088/1361-6471/ab9796
• 发表时间: 2019-09
• 期刊: arXiv: Instrumentation and Detectors
• 作者: D. Mei;Mukund Bharadwaj;W.-Z. Wei;R. Panth;Jing Liu;H. Mei;Yangyang Li;P. Acharya;S. Bhattarai;K. Kooi;M. Raut;Xiansong Sun;Alex Kirkvold;Kunming Dong;Xianghua Meng;Guojian Wang;Gang Yang

Fabrication and characterization of high-purity germanium detectors with amorphous germanium contacts

• DOI: 10.1088/1748-0221/14/02/p02019
• 发表时间: 2019-02-01
• 期刊: JOURNAL OF INSTRUMENTATION
• 影响因子: 1.3
• 作者: Meng, X-H;Wang, G-J;Mei, D-M
• 通讯作者: Mei, D-M

The impact of the charge barrier height on Germanium (Ge) detectors with amorphous-Ge contacts for light dark matter searches

• DOI: 10.1140/epjc/s10052-020-8029-0
• 发表时间: 2020-02
• 期刊: The European Physical Journal C
• 作者: Wenzhao Wei;R. Panth;Jing Liu;H. Mei;D. Mei;Guojian Wang

HPGe detector field calculation methods demonstrated with an educational program, GeFiCa

通过教育程序 GeFiCa 演示 HPGe 探测器场计算方法

• DOI: 10.1140/epjc/s10052-020-7786-0
• 发表时间: 2020
• 期刊: The European Physical Journal C
• 作者: Li, Jianchen;Liu, Jing;Kooi, Kyler
• 通讯作者: Kooi, Kyler

Characterization of high-purity germanium detectors with amorphous germanium contacts in cryogenic liquids

低温液体中非晶锗触点高纯锗探测器的表征

• DOI: 10.1140/epjc/s10052-020-8235-9
• 发表时间: 2020
• 期刊: The European Physical Journal C
• 作者: Panth, R.;Liu, J.;Abt, I.;Liu, X.;Schulz, O.;Wei, W.-Z.;Mei, H.;Mei, D.-M.;Wang, G.-J.
• 通讯作者: Wang, G.-J.