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High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule

Physical Review Accelerators and Beams 2024年第9期27卷 092003页

作者： Weimin Pan Jiyuan Zhai Feisi He Rui Ge Zhenghui Mi Peng Sha Song Jin Ruixiong Han Qunyao Wang Haiying Lin Guangwei Wang xuwen Dai Zhanjun Zhang Mei Li Minjing Sang Liangrui sun Rui Ye Tongxian Zhao Shaopeng Li Keyu Zhu Baiqi Liu Xiaolong Wang Xiangchen Yang Xiaojuan Bian Xiangzhen Zhang Huizhou Ma Jianbing Zhao Liang Zhang Hui Zhao Runbing Guo Zhihui Mu Conglai Yang Xiaobing Zheng Chao Dong Hongjuan Zheng Zhengze Chang Xiaochen Yang Tongming Huang Qiang Ma Zihan Wang Ming Liu Wenzhong Zhou Senyu Chen Chinese Academy of Sciences Beijing 100049 China Beijing 100049 China

The world’s first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (rf) cavities treated by medium-temperature furnace baking (mid-T bake) was developed at the Institute of High Energy Physics, Chinese Academy of Sciences. The 9-cell cavities in the cryomodule achieved an unprecedented high average intrinsic quality factor (Q0) of 3.8×1010 at 16 MV/m and 3.6×1010 at 21 MV/m in the horizontal test. The cryomodule can operate stably up to a total continuous wave rf voltage greater than 193 MV, with an average cavity usable accelerating gradient of more than 23 MV/m. The results significantly exceed the specifications of Circular Electron Positron Collider and Dalian advanced light source and the other high repetition rate free electron laser facilities [Linac Coherent Light Source II (LCLS-II), LCLS-II-high energy, Shanghai High Repetition Rate X-ray FEL and Extreme Light Facility, Shenzhen Superconducting Soft X-Ray Free Electron Laser, etc.]. There is evidence that the mid-T bake cavity may not require fast cooldown or long processing time in the cryomodule. This paper reviews the cryomodule performance and discusses some important issues in cryomodule assembly and testing.

关键词： Radio frequency techniques Superconducting RF

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南海天然气水合物钻采机理与调控研究进展

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中国科学基金 2021年第6期35卷 940-951页

作者：孙金声程远方秦绪文孙友宏金衍王志远李淑霞陆程屈沅治吕开河王成文王金堂王韧中国石油大学(华东) 青岛266580 中国石油集团工程技术研究院有限公司北京102206 中国地质调查局北京100037 广州海洋地质调查局广州510075 中国地质大学(北京) 北京100083 中国石油大学(北京) 北京102249 中国地质调查局油气资源调查中心北京100083

海域天然气水合物试采存在井壁易失稳、井漏、流动安全风险高、储层改造困难、单井日产气量低、稳产时间短等一系列技术难题,水平井、多分支井等有望提高产气量的复杂结构井钻采难度更大。本文基于对国内外水合物钻采研究进展以及已开... 详细信息

海域天然气水合物试采存在井壁易失稳、井漏、流动安全风险高、储层改造困难、单井日产气量低、稳产时间短等一系列技术难题,水平井、多分支井等有望提高产气量的复杂结构井钻采难度更大。本文基于对国内外水合物钻采研究进展以及已开展天然气水合物勘探、试采工程现状的跟踪调研,总结分析了海域天然气水合物试采面临的关键技术难题,进而根据我国南海天然气水合物试采工程特性,对天然气水合物储层力学特性动态演化规律及工程响应机制、井筒工作液与天然气水合物储层作用机理和调控方法、天然气水合物钻采井筒多相流动障碍形成机制与安全控制方法、储层天然气水合物相变和渗流多场时空演化规律、天然气水合物储层结构改造理论与高效开发模式等方面研究进展进行了论述,以期为我国海域天然气水合物钻采理论及技术的发展提供借鉴。

关键词：南海天然气水合物钻采工程力学特性井筒工作液相变及渗流特征

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Amphipathic Side Chain of a Conjugated Polymer Optimizes Dopant Location toward Efficient N-Type Organic Thermoelectrics

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ADVANCED MATERIALS 2021年第4期33卷 2006694-2006694页

作者： Liu, Jian Ye, Gang Potgieser, Hinderikus G. O. Koopmans, Marten Sami, Selim Nugraha, Mohamad Insan Villalva, Diego Rosas sun, Hengda Dong, Jingjin Yang, xuwen Qiu, Xinkai Yao, Chen Portale, Giuseppe Fabiano, Simone Anthopoulos, Thomas D. Baran, Derya Havenith, Remco W. A. Chiechi, Ryan C. Koster, L. Jan Anton Univ Groningen Zernike Inst Adv Mat Nijenborgh 4 NL-9747 AG Groningen Netherlands Univ Groningen Stratingh Inst Chem Nijenborgh 4 NL-9747 AG Groningen Netherlands King Abdullah Univ Sci & Technol KAUST Phys Sci & Engn Div PSE KAUST Solar Ctr KSC Thuwal 239556900 Saudi Arabia Linkoping Univ Dept Sci & Technol Lab Organ Elect SE-60174 Norrkoping Sweden Univ Ghent Dept Inorgan & Phys Chem Krijgslaan 281S3 B-9000 Ghent Belgium

There is no molecular strategy for selectively increasing the Seebeck coefficient without reducing the electrical conductivity for organic thermoelectrics. Here, it is reported that the use of amphipathic side chains in an n-type donor-acceptor copolymer can selectively increase the Seebeck coefficient and thus increase the power factor by a factor of approximate to 5. The amphipathic side chain contains an alkyl chain segment as a spacer between the polymer backbone and an ethylene glycol type chain segment. The use of this alkyl spacer does not only reduce the energetic disorder in the conjugated polymer film but can also properly control the dopant sites away from the backbone, which minimizes the adverse influence of counterions. As confirmed by kinetic Monte Carlo simulations with the host-dopant distance as the only variable, a reduced Coulombic interaction resulting from a larger host-dopant distance contributes to a higher Seebeck coefficient for a given electrical conductivity. Finally, an optimized power factor of 18 mu W m(-1) K-2 is achieved in the doped polymer film. This work provides a facile molecular strategy for selectively improving the Seebeck coefficient and opens up a new route for optimizing the dopant location toward realizing better n-type polymeric thermoelectrics.

关键词： conjugated polymers dopant location N-type doping organic thermoelectrics Seebeck coefficient solution processing

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Parasitic modes suppression in CW cold tests of 1.3 GHz 9-cell high Q cavities at IHEP

arXiv

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arXiv 2021年

作者： Mi, Zhenghui He, Feisi Pan, Weimin Sha, Peng Zhai, Jiyuan Dai, xuwen Jin, Song Zhang, Zhanjun Dong, Chao Liu, Baiqi Zhao, Hui Ge, Rui Zhao, Jianbing Mu, Zhihui Du, Lei sun, Liangrui Zhang, Liang Yang, Conglai Zheng, Xiaobing Lin, Haiying Wang, Guangwei He, Xiangcong Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Key Laboratory of Particle Acceleration Physics & Technology Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Center for Superconducting RF and Cryogenics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China

The CW RF test of 1.3 GHz 9-cell cavity in liquid helium bath at 2 K is a very important key point in the cavity procurement. Some problems can be found through the test, according which to optimized and improve the process of cavity. Recently, Medium temperature (mid-T) furnace bake of 1.3 GHz 9-cell cavities have been carried out at IHEP. Through the proceed of mid-T bake, the quality factor of cavity has been greatly improved. While the excitation of the parasitic modes in the high Q cavities CW cold test has been encountered, which implies an error source for the cavity gradient and quality factor determination. In order to ensure the testing accuracy of superconducting cavity, we have improved the testing system. Finally, the parasitic mode is completely suppressed and the CW RF cold test of high Q cavity is guaranteed. © 2021, CC BY.

关键词： Superfluid helium

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High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule

arXiv

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arXiv 2023年

作者： Zhai, Jiyuan Pan, Weimin He, Feisi Ge, Rui Mi, Zhenghui Sha, Peng Jin, Song Han, Ruixiong Wang, Qunyao Lin, Haiying Wang, Guangwei Li, Mei Sang, Minjing sun, Liangrui Ye, Rui Zhao, Tongxian Li, Shaopeng Zhu, Keyu Liu, Baiqi Wang, Xiaolong Yang, Xiangchen Bian, Xiaojuan Zhang, Xiangzhen Ma, Huizhou Dai, xuwen Zhang, Zhanjun Zhang, Liang Zhao, Hui Guo, Runbin Mu, Zhihui Yang, Conglai Zheng, Xiaobing Dong, Chao Huang, Tongming Ma, Qiang Zheng, Hongjuan Liu, Ming Wang, Zihan Zhou, Wenzhong Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Key Laboratory of Particle Acceleration Physics & Technology Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Center for Superconducting RF and Cryogenics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China

World’s first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (RF) cavities treated by medium-temperature furnace baking (mid-T bake) was developed, assembled and tested at IHEP for the Dalian Advanced Light Source (DALS) and CEPC R&D. The 9-cell cavities in the cryomodule achieved an unprecedented highest average Q0 of 3.8 × 1010 at 16 MV/m and 3.6 × 1010 at 21 MV/m in the horizontal test. The cryomodule can operate stably up to a total CW RF voltage greater than 191 MV, with an average cavity CW accelerating gradient of more than 23 MV/m. The results significantly exceed the specifications of CEPC, DALS and the other high repetition rate free electron laser facilities (LCLS-II, LCLS-II-HE, SHINE, S3FEL). There is evidence that the mid-T bake cavity may not require fast cool-down or long processing time in the cryomodule. This paper reviews the cryomodule performance and discusses some important issues in cryomodule assembly and testing. © 2023, CC BY.

关键词： Free electron lasers

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深层平板载荷试验变形模量计算新方法

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山西建筑 2020年第8期46卷 1-4页

作者：尚许雯尚银生贾迎泽杨进堂孙存珠山西省交通规划勘察设计院有限公司山西太原030012 山西省勘察设计研究院有限公司山西太原030013 山西省建筑科学研究院有限公司山西太原030001

根据Mindlin课题解析解,结合深层平板载荷试验的尺寸确定及试验深度等技术要求,提出一个新的计算变形模量公式。当μ=0.00~0.50;z=5.0 m,10.0 m及趋于无穷大时(工程意义上或d z,d/22z),其相应于修正系数的部分,在不大于0.500的范围内,... 详细信息

根据Mindlin课题解析解,结合深层平板载荷试验的尺寸确定及试验深度等技术要求,提出一个新的计算变形模量公式。当μ=0.00~0.50;z=5.0 m,10.0 m及趋于无穷大时(工程意义上或d z,d/22z),其相应于修正系数的部分,在不大于0.500的范围内,随土类的泊松比增大而增大,其值介于0.375~0.500;高氏修正系数在不小于0.500的范围内,随土类泊松比的增加而增加,其值介于0.500~0.902;顾氏修正系数随试验深度的增加而减小,其值介于0.500~0.555。并指出现行《岩规》推荐的深层平板载荷试验变形模量计算方法建立过程不够严谨,不能满足有关技术要求。

关键词：深层平板载荷试验变形模量 Mindlin解析解泊松比修正系数

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紧张、负面情绪和中国被监禁妇女的犯罪水平

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警学研究 2020年第2期 34-49页

作者：孙懿贤陆海山吴瑜宁林文旭吴一澜(译) 美国特拉华大学北京市东城区政府北京100010 美国韦恩州立大学台湾文藻外语大学华东政法大学上海201620

一般紧张理论(GST)是最常被测试的犯罪学理论之一。根据GST,紧张倾向于产生负面情绪,产生纠正措施的压力,如犯罪和违法行为。虽然GST得到了强有力的实证支持,但一个未得到充分解决的问题是,在评估该理论的普遍性时,抽样人口缺乏多样性... 详细信息

一般紧张理论(GST)是最常被测试的犯罪学理论之一。根据GST,紧张倾向于产生负面情绪,产生纠正措施的压力,如犯罪和违法行为。虽然GST得到了强有力的实证支持,但一个未得到充分解决的问题是,在评估该理论的普遍性时,抽样人口缺乏多样性。本研究以我国四所监狱335名在押女性为研究对象,探讨压力与消极情绪对女性犯罪水平的影响。压力变量、身体虐待和歧视对女性服刑人员犯罪水平有正向影响,而消极情绪与女性服刑人员犯罪水平无显著相关。两个控制变量,即目前的犯罪年龄和受教育程度,是预测女性犯罪的指标,其中较年轻和受教育程度较低的女性犯罪更严重。讨论了对未来研究和政策的影响。

关键词：一般紧张理论中国监禁妇女犯罪

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不同浸种处理对美丽决明和绒果决明种子萌发的效果研究

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种子 2019年第5期38卷 70-73页

作者：陈莹孙苗苗钟丽媚李许文代色平广州市林业和园林科学研究院

以美丽决明和绒果决明为研究材料,观察种子外部形态,测定种子长度、宽度、厚度、千粒重和硬实率,并研究温水浸种(处理温度为20,40,60℃和80℃)、100℃热水浸种(处理时间为5,10 min和20 min)及98%浓硫酸浸种(处理时间为2,5,10,20 min和30... 详细信息

以美丽决明和绒果决明为研究材料,观察种子外部形态,测定种子长度、宽度、厚度、千粒重和硬实率,并研究温水浸种(处理温度为20,40,60℃和80℃)、100℃热水浸种(处理时间为5,10 min和20 min)及98%浓硫酸浸种(处理时间为2,5,10,20 min和30 min)对2种决明属硬实种子萌发的影响。结果表明:美丽决明种子长度(5.44±0.24)mm,宽度(4.39±0.24)mm,厚度(1.49±0.14)mm,千粒重为(2.66±0.07)g,硬实率85.00%;绒果决明种子长度(8.38±0.54)mm,宽度(5.49±0.46)mm,厚度(1.79±0.65)mm,千粒重(5.54±0.03)g,硬实率82.50%。温水浸种处理和浓硫酸浸种处理对美丽决明和绒果决明2种硬实种子的萌芽都表现出明显的促进作用,但不可采用100℃的热水破除种子硬实。本试验中,采用98%浓硫酸浸种美丽决明种子20 min和采用98%浓硫酸浸种绒果决明种子30 min,是打破种子硬实最佳的方法,发芽率分别达到30.00%和90.00%,比对照分别提高了1.61倍和3.75倍。

关键词：苏木科美丽决明绒果决明种子硬实萌发

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Medium-temperature furnace bake of superconducting radio-frequency cavities at ihep

arXiv

引用

arXiv 2020年

作者： He, Feisi Pan, Weimin Sha, Peng Zhai, Jiyuan Mi, Zhenghui Dai, xuwen Jin, Song Zhang, Zhanjun Dong, Chao Liu, Baiqi Zhao, Hui Ge, Rui Zhao, Jianbing Mu, Zhihui Du, Lei sun, Liangrui Zhang, Liang Yang, Conglai Zheng, Xiaobing Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Key Laboratory of Particle Acceleration Physics & Technology Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Center for Superconducting RF and Cryogenics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China

Recently, heat treatment between 250 °C and 500 °C has been attempted to improve quality factor (Q) of superconducting radio-frequency cavities at FNAL and KEK. Experiments of such medium temperature (mid-T) bake with furnaces have also been carried out at IHEP. Firstly, over ten 1.3 GHz 1-cell cavities were treated with different temperatures at a small furnace, which all demonstrated improvement of Q and anti-Q-slope phenomenon. The average quality factor has reached 3.6×1010 when the gradient is 16 MV/m，while the highest Q is 4.9×1010@16MV/m;the maximum gradients of these 1-cell cavities are between 25.1 and 36.9 MV/m. Then, the recipe of mid-T furnace bake at 300 °C for 3 hours has been applied to six 1.3 GHz 9-cell cavities at a new big furnace, which have all shown higher Q and anti-Q-slope at medium field (16~24 MV/m). The average quality factor has reached 3.8×1010 when the gradient is 16 MV/m. The maximum gradients of the 9-cell cavities are between 22.7 and 26.5 MV/m. © 2020, CC0.

关键词： Radio waves

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含铜镍尾矿重金属溶出特性试验研究

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材料与冶金学报 2019年第2期18卷 147-152页

作者：夏瑜冯泽珅张清孙桂容张淳关曙雷何绪文中国矿业大学(北京)化学与环境工程学院北京100083

本研究以位于我国东北典型铜镍矿区为研究对象,对其进行尾矿重金属溶出特性分析,通过静态浸出实验研究尾矿粒径和固液比对尾矿中镍(Ni)释放浓度及溶液pH的影响;并研究模拟酸雨条件下尾矿中Ni和铜(Cu)的溶解释放规律;此外,也分析了微生... 详细信息

本研究以位于我国东北典型铜镍矿区为研究对象,对其进行尾矿重金属溶出特性分析,通过静态浸出实验研究尾矿粒径和固液比对尾矿中镍(Ni)释放浓度及溶液pH的影响;并研究模拟酸雨条件下尾矿中Ni和铜(Cu)的溶解释放规律;此外,也分析了微生物对尾矿中重金属的溶出特性的影响.结果表明:在初始pH=7. 0的浸出液中,尾矿中的Ni在第1天就释放得较为完全,其质量浓度达到0. 85～1. 73 mg/L。减小尾矿粒径会增加Ni释放量,固液比过高会减小Ni的浸出;模拟酸雨(pH=4. 0和6. 0)条件下,淋溶液pH值相对较稳定,说明尾矿的缓冲能力较强,低pH条件利于Ni和Cu的溶出.静态浸出和动态淋溶实验初期,Ni的质量浓度基本高于《污水综合排放标准》(GB8978-1996)中的Ni排放限值(1. 0 mg/L),说明铜镍尾矿具有污染水环境的风险.微生物溶出试验结果表明:35 d后Ni和Cu浸出率达到了38. 4%和32. 7%,较酸浸条件下分别提高了74. 5%和28. 7%,说明微生物作用会加剧重金属Ni和Cu的释放,从而增加其环境风险.

关键词：含铜镍尾矿重金属静态浸出动态淋溶

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