共查询到18条相似文献,搜索用时 736 毫秒
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按北京正负电子对撞机重大改造工程(BEPCⅡ)计划,为压缩束团尺寸、提高探测器的分辨率以及粒子识别能力,在南对撞区分别安装1对强聚焦超导插入四极磁体(SCQ)和1台超导螺线管探测器磁体(SSM)。本文针对1对超导插入四极磁体的冷却,采用数值模拟的方法给出了SCQ磁体分别采用超临界氦流和过冷氦流两种冷却方式下冷却流程的热力参数,通过对模拟结果的分析,给出了适合该超导插入四极磁体的冷却方式和正常运行的热力参数。还给出了该低温系统关键设备之一的过冷器的设计方法以及设计参数。 相似文献
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高能同步辐射光源(HEPS)氮低温制冷循环系统为储存环隧道内的7个超导高频腔低温恒温器提供液氮冷量。氮低温制冷循环系统的热力学分析目的是针对HEPS超导高频腔低温恒温器的特点,建立系统的热力学分析模型,研究其工作过程,计算分析系统的制冷系数与循环增压比之间的对应关系。同时,考虑到系统的整体布局,进一步分析计算氮低温制冷循环系统中氮气压缩机和低温透平膨胀机的火用损,优化了系统的热力学设计参数。HEPS氮低温制冷循环系统的热力学性能分析与计算结果对于系统最优化设计和后期工程实践具有一定的指导意义。 相似文献
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《中国原子能科学研究院年报》2017,(0)
正中国先进研究堆(CARR)冷中子源系统中设备冷却水回路系统为确保堆外氦制冷回路正常运行的保障系统,它是重要回路之一。冷中子源系统中氦制冷回路系统运行时,系统内压缩机和冷箱中的透平膨胀机因发热而需要冷却,其冷却源来自设备冷却水系统,以维持其机体在合适的温度范围内。设备冷却水回路系统验收试验包括:系统回路水压力试验;回路装置密封性试验;回路系统不带负荷运转试验;回路系统带负荷运转试验。系统回路水压力试验针对全冷却回路,包括压缩机、冷箱供水管路、换热器、冷却泵以及相关阀门仪表和接口,采用水为介质,打压方案为通过排水 相似文献
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上海光源是第三代同步辐射光源。在上海光源的二期工程中,超导三次谐波腔将用于拉伸束团长度,提升束流托歇克寿命。三次谐波腔工作在被动模式下,谐波腔工作频率(约1.5 GHz)为主腔工作频率(约500 MHz)的三倍。为实现谐波腔高频系统的调谐控制,需要对1.5 GHz信号进行下变频处理,便于后端对信号采样处理。本文介绍了三种下变频的方案,将1.5 GHz射频信号降频为31.25 MHz中频信号,分析了各个方案的特点和影响下变频结果的因素。测试结果显示:三种变频方案在不同的动态范围具有良好的线性,均已满足谐波腔控制需求。其中基于倍频器的变频模块为最优方案,其线性动态区间大于70 dB,同时产生的中频信号的相位噪声最低,最终将在谐波腔的控制系统中采用。 相似文献
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采取堆腔注水策略冷却熔融池对缓解严重事故后果、降低安全壳的失效概率具有十分重要的作用。本文采用SCDAP/RELAP5程序,首先以韩国APR1400相关实验结果对堆腔外部注水自然对流冷却能力进行比对分析,然后建立了耦合堆腔注水措施的融熔池冷却的核电厂模型,以非能动压水堆为研究对象,针对冷段大破口失水事故(LBLOCA)始发严重事故序列,分析堆芯熔融进展过程中实施堆腔注水策略后融熔池的冷却特性及堆腔外部注水的自然循环能力。分析结果表明,LBLOCA下,当堆芯出口温度达到923K时,实施堆腔注水后能有效冷却下封头内的熔融池,从而保持压力容器的完整性。 相似文献
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在现有的冷源设计中,两相氢循环因其换热能力强而被广泛采用,但它最大的缺点是存在含气率影响慢化的稳定性。能否采用单相循环代替两相循环实现高热流密度的热量输出,是待研究的重点。为兼顾循环流量等宏观特性和流场、温度场分布等细节参数的分析,提出了一种基于迭代的耦合算法,将一维理论公式与三维数值仿真模型相结合,用于分析中国先进研究堆单相冷包方案的可行性。研究发现,单相循环只能带走约30%的核发热,但由于冷包增加了氦冷却套,其余热量全部通过氦气对冷包壁面的直接冷却带走。温度场的分析显示液氢和壁面的最高温度分别为21.7和23.7 K。这说明冷包得到了充分冷却,单相循环及单相冷包结构可满足工程需要。 相似文献
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Zhen-Yu Ma Shen-Jie Zhao Xu-Ming Liu Yue-Chao Yu Hong-Ru Jiang Xiang Zheng Qiang Chang Zi-Gang Zhang Kai Xu Yan Wang Yu-Bin Zhao Hong-Tao Hou 《核技术(英文版)》2022,33(1):107-119
The Shanghai High Repetition Rate XFEL and Extreme Light Facility(SHINE) project will use 6001.3 GHz fundamental power couplers, which are modified based on TTF-Ⅲ power couplers, for continuous-wave operation with input power up to approximately 7 k W. The first batch of 20 sets of 1.3 GHz coupler prototypes was fabricated from three domestic manufacturers for the SHINE project. To better characterize the radio frequency conditioning phenomena for validating the performance of power couplers, a ... 相似文献
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MA Guangming LIU Jianfei HOU Hongtao MA Zhenyu FU Zechuan ZHANG Zhigang ZHAO Zhentang 《核技术(英文版)》2009,20(3):129-132
In the superconducting RF module, the dissipation power of the niobium cavity is an important parameter. In the Superconducting radio frequency (SRF) module’s acceptance test at Shanghai Synchrotron Radiation Facility (SSRF), the Venturi tube is used to measure the quality factor of SRF cavity at 4.2 K. During the test, the venturi tube is be calibrated by increasing heat load with internal heater. In this paper, the horizontal test principle and venturi effect are briefly introduced. The authors find out a... 相似文献
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The decay heat-driven temperature transients of the in-vessel components following a postulated loss of all in-vessel cooling have been calculated. The resulting time-dependent heat load to the vacuum vessel is due to radiation from the backplate and convection of postulated steam between backplate and vacuum vessel. It is shown, that even for a failure of all in-vessel cooling and total loss of power, the ITER design can rely on passive decay heat removal by natural circulation in one of the two existing cooling loops of the vacuum vessel. A mathematical model describes the transient operating conditions and shows that the temperature established by natural circulation does not exceed 200°C at the maximum shut down heat load to the vacuum vessel. Therefore, no additional emergency cooling system is required if the existing heat exchanger is designed for natural circulation and a bypass is used during normal operation to maintain operation temperature. 相似文献
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Preliminary Calculations of the Thermal Stress Influence on the Magnetic Field of CYCIAE-100 Project
YANG Jian-jun ZHANG Tian-jue 《中国原子能科学研究院年报》2005,(1):38-39
During the long time operation of the compact cyclotron, the RF power will be fed into the RF cavity Some of the power is used for accelerating the H- beam, while the other is lost by heating the cavity and the magnet pole. Although the cooling water flowing around the outside of the cavity can take away the heat, the temperature of the pole will increase slowly. This phenomenon has been already observed in 1994, when the 30 MeV cyclotron was in operation with temperature variation of the pole about 25 ~C The thermal stress caused by the slow shift of the temperature will dilate the pole and diminish the gap height between the upper and the lower pole, which will result in the change of the magnetic field. Therefore, it is important to investigate the influence of temperature on the field. 相似文献
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Ranajoy Bhattacharya Naveen Kr Sahu Arani Ali Khan Hasina Khatun A.K. Sinha 《Fusion Engineering and Design》2013,88(4):253-257
The paper presents the electrical and thermo-mechanical design of single stage beam recovery system for 120 GHz, 1 MW gyrotron. The electrical study shows that the cylindrical shape single stage beam recovery system enhances the efficiency by 66.26%. The maximum power deposited to collector in depressed collector operation is 0.48 MW for electronic efficiency, 30% and 1.44 MW for DC electron beam. The thermo-mechanical analysis has been performed to evaluate the water cooling system. The cooling system has capability of accommodating a peak wall loading, 0.9 kW/cm2 at flow rate of 1500 l/min for safe operating time, 60 ms. Further, a high voltage analysis is also carried out to appraise the electric field distribution in the collector. 相似文献
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HAN Ruixiong ZOU Zhengping ZHU Hongyan CHANG Zhengze GE Rui LI Shaopeng 《原子能科学技术》1959,54(10):1979-1984
To meet the alignment requirement of superconducting radio frequency (SRF) cavity and superconducting magnet at cryogenic temperature in the accelerator system, the design of adjustment and alignment of the cold mass in superfluid helium cryomodule should be analyzed. The cryogenic deformation of the cold mass at the 2 K superfluid helium temperature level was simulated and obtained by the finite element method, meanwhile the simulation analysis method was checked by the cryogenic deformation data of the cold mass online measured by the wire of position monitor (WPM). The results show that the simulation result and measurement result have a good consistency, and it provides an important data foundation for the alignment design in the type of bottom supported cryomodule. 相似文献