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《中国原子能科学研究院年报(英文版)》2004,(1)
The PHOS which in ALICE is to detect and identify real photons and measure with high resolution their 4-momentum with the prospect to perform the physics programs exploiting direct photon and light neutral mesons as privileged probes. The PHOS is composed… 相似文献
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《中国原子能科学研究院年报(英文版)》2006,(1)
The acceptance of central region should be considered after the central ray is finished. This can check whether the central region design is reasonable or not, because in practice it is the bunched beam 相似文献
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《中国原子能科学研究院年报(英文版)》2004,(1)
The energy levels of p-shell hyper-nuclei Λ7Li, Λ9Be and 1Λ6O are investigated using the Hyperball spectrometer with energy resolutions of a few keV at KEK and AGS.A complete bound state level scheme of Λ7Li is established. The strength of the ΛN spi 相似文献
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CARR燃料组件是板状元件,共有21块燃料板和20个矩形冷却流道。流道宽度不均匀,从外到内分别有2.59、2.45、2.32和2.20mm4种宽度,长度均为66.6mm。燃料组件的主要特点是热流密度高、传热性能好。良好的组件流量分配特性是充分发挥这些优点的重要保障。对于这种窄缝流道的水力特性和流量分配实验,国内外均进行不多,加之结构复杂,流速很高,因此,很有必要对它们进行实验验证。 相似文献
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A. V. Bushuev A. S. Zatolokin V. N. Zubarev A. F. Kozhin I. M. Proshin 《Atomic Energy》2003,94(4):253-259
The possibility of using activation -spectrometry to determine the mass content of nuclear materials in matter is investigated. Irradiation of samples for a short time with moderated neutrons from a ~107 sec–1 Pu–Be source is used to induce 1436 keV -ray emission from 138Cs. These -rays are suitable for measurements; the mass of the nuclear materials is determined from the intensity of the radiation. Three series of experiments are performed with sets of samples consisting of uranium and uranium dioxide with different mass and degrees of enrichment.Experiments showed that the error in determining the mass of uranium samples can reach 1–3% with 30–60 min irradiation and the same measurement duration.Special experiments were performed to investigate the influence of the experimental geometry and the self-absorption of the rays in the sample, which limit the possibility of -spectrometric measurements on samples of nuclear materials.The activation -spectrometric method can be used for analyzing metallic uranium samples, powder samples, samples of fuel micropellets and uranium hexafluoride, and plutonium samples. 相似文献
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《中国原子能科学研究院年报(英文版)》2004,(1)
It is important to determine the sensitive volume (Sv) thickness of micro-electronic devices, since the Sv thickness is a key parameter for estimating single event rates in space. Most of the models for proton single event upset (SEU) predictions use the … 相似文献
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压力和温度对静力水准系统精度影响分析 总被引:1,自引:1,他引:1
静力水准系统(Hydrostatic leveling system,HLS)的工作介质是液体.由于纯净水的诸多优点,在本系统中采用水作为工作介质.液体的特性是极易受到外界的影响而改变它的物理形态.在HLS系统中,压力、温度等因素对系统的测量有着非常大的影响.本文分别分析了压力和温度对静力水准系统测量精度的影响.为了消除压力的影响,在系统设计的时候采用了密封钵体和钵体之间用等压气管连接的办法,保证系统在工作时每个钵体中的工作液体表面上的大气压是一致的.温度的影响包括水管中温度梯度的影响和钵体之间温度差异的影响.通过分析,对于水管中温度梯度的影响,只要在安装系统时保证水管的垂直高差足够小,就可以忽略;而对于钵体之间的温度差异的影响,在每个钵体传感器中都安装了温度传感器,实时地测量钵体的温度,并和CCD测量数据同时采集,通过理论计算得到温度修正公式,对每个钵体中的CCD读数进行温度修正.通过实验数据分析,可以把温度的影响修正到允许的误差范围以内. 相似文献
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Hydrostatic leveling system(HLS) is widely used in precision engineering survey,especially the alignment of particle accelerator,and the tidal effects on the measurement accuracy of HLS is non-ignorable.thus studies on tidal effects on the HLS is vital.A set of HLS was installed in Jingxian seismostation for verifying the methods to handle the tidal effects on the readings of HLS.Harmonic analysis of the data recorded by HLS and DSQ water tube clinometers in Jingxian seismostation and contrastive analysis of the results are completed.The tilt tide can be well reflected in the data of the both instruments and the results are both reliable.The reasons of the difference between the results are analyzed in this paper.Besides,a validation study based on the measurement data of the HLS used in SPring-8 storage ring for tidal correction on the reading of HLS is completed.The research establishes a foundation for HLS to be applied in micron-level precision alignment of particle accelerator in the future. 相似文献
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合肥光源原有的辐射监测系统是为衰减运行模式而设计建造的。为了更好地促进用户实验的科研产出,合肥光源正在进行恒流运行关键系统改造。在改造中,为了保障实验人员和设备的安全,根据恒流运行要求增加了辐射剂量监测点和完善了安全联锁功能。系统基于EPICS开发,由探测器、通讯模块、数据采集监测软件、数据分析系统等组成。该系统既能监测光源区及周边的辐射剂量率水平,还具备计算积分剂量、历史剂量查询以及必要的安全联锁等功能。新系统已经运行三个多月,系统稳定可靠,能很好地满足合肥光源恒流运行模式对辐射监测的要求。 相似文献