共查询到20条相似文献,搜索用时 15 毫秒
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ZHOU Yue-Hua LU Chang-Guo GU Wei-Xin LU Wei-Da QUE You-Kun LI Pei-Qin HAO Wei ZHOU Li ZHU Guo-Sheng ZHENG Xiao-Ming CHENG Wen-Jun 《中国物理C(英文版)》1989,13(11):973-979
The design and construction details of the barrel shower counter for BES are discussed.The barrel shower counter is cylinderical,of 2.5m inner diameter,3.4m outer diameter and 3.85m length,constructed on an aluminum spool of 2.5m diameter,3 cm thickness and 4.23m length.There are 23 layers of lead (0.5r.l. as an absorber) and 24 layers of selfquenching streamer (SQS) tubes.The total weight of the counter is 40,000kg and 80% of 4π sr soild angle coverage. 相似文献
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WANG Man LI Jin CUI Xiang-Zong XIA Xiao-Mi LAI Yuan-Fen YAO Xiao-Guang 《中国物理C(英文版)》1987,11(3):321-326
A gas sampling Em Shower counter of the lead-SQS tube sandwich type was constructed and tested. The Shower counter uses Aluminium tubes and anode readout. Energy resolution σ/E is 15.5% at Ee=1GeV. Range of the energy response linearity is 0—2GeV. This paper describes the beam test and the performance studied under various conditions. 相似文献
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CUI Xiang-Zong 《中国物理C(英文版)》1988,12(1):1-5
Practical formulas for calculating position sensing by charge division were given.They were applied to experiments on self-quenching streamer (SQS) tubes with different shorter wire lengths (smallest resistance 425Ω) and the position resolution obtained was 1.1% for a 37.3cm wire.The error of position sensing by charge division on single tube was compared to that on parallelly connected double tuble tubes.Possible errors of determing position of the shower "Axis" by charge division method on the wires were studied. 相似文献
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北京谱仪(BESIII)超导磁体是为北京正负电子对撞机二期改造工程(BEPCII)制造的超导探测器磁体.它采用了国际上先进的两相氦间接冷却方式及线圈内绕技术.其超导线为铝稳定体NbTi/Cu超导电缆.由于生产工艺上长度的限制,BESIII超导电缆由三段电缆焊接而成.焊接匝电阻必须限制在一定范围内,以免产生过大的焦耳热,影响磁体的正常运行.超导电缆由支撑筒内部引出到颈管及阀箱部分时,有一定角度的平弯及侧弯,这部分弯曲电缆的载流能力也是必须要考虑的问题.为此,我们进行了两次超导电缆性能测试实验,对超导电缆弯曲前后的载流能力进行了测试,并且测量了超导电缆低温下的焊接电阻.本文提供了这两次实验的实验结果及分析. 相似文献
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In thls paper the method of multiple scales, theory of normal form and universal unfolding and the Melnikov's method are used to further study local bifurcations, degenerate bifurcations of codimension two and global bifurcations. Some significant results are obtained. 相似文献
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NI Hui-Ling ZHOU Hua-Shi JIANG Chun-Hua GUO Hong-Fei XU Jian-Guo ZHU Qi-Ming WANG Fang LIU Wei LI Jia-Hua 《中国物理C(英文版)》1990,14(6):490-499
In this paper,we present the design and construction of the luminosity monitor,the main features of the detectors,and the functions of the functions of the read-out circuits and data acquisition system of the Beijing spectrometer (BES).In october of 1988,the luminosity monitor provided the first colliding luminosity of BEPC,and the initial luminosity was 5×1028/cm2.sec.During the later colliding experimental operation,the luminosity monitor also provided the colliding luminosities,which were in good agreement with those calculated by the operation parameters of the BEPC. 相似文献
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ZHOU Qing-Yi WANG Shu-Hong PAN Hui-Bao LUO Zi-Hua XIAO Lan-Rong ZHANG Ying-Xiang 《中国物理C(英文版)》1987,11(1):85-91
The special design and the technique of developing the 10MeV Beijing proton linac to 35MeV are described. The performance level of major components and the beam test results of whole machine are presented. 相似文献
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LI Yan-Guo HE Chang-Xiao YUAN Yu-Kui JIANG Yin-Lin XU Chun-Xian DAI Yi-Fang CHEN Duan-Bao HE Hui-Lin WANG Jian-Wei 《中国物理C(英文版)》1989,13(1):5-10
The pulse shape and the intensity of Cerenkov light from extensive air shower have been recorded by using two different types of photomultipliers (fast and slow).The distribution of the FWHM of Cerenkov light pulse and the spectrum of Cerenkov photo density have been measured for E>5×1014eV,at sea level.Comparing the two intensity results from two types of tubes indicate that the system which consists of the slow tubes and the peak ADC is not only simple but also cheap for the Cerenkov light intensity measurement. 相似文献
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研究了电子束蒸发a-Si1-xNdx的薄膜的ESR参数g因子、线型因子l,峰-峰线宽△Bpp、自旋密度Ns随组分x变化的特性.基于这类薄膜的光吸收和电导特性,应用带Nd背键的悬挂键模型分析讨论了这些变化特性的物理原因. 相似文献
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The prototype of the time expansion chamber, one kind of drift chambers, inwhich the drift region and amplification region is well separated, is described. Its prin-ciple, characteristic, construction and some experimental results are given in detail, Theseresulte are: signals of ionization process along a single charged particle track; the driftvelocities of the electrons in several gases; and the counts distribution of the ionizationclusters in the unit track of a beta particle. And some possible improvements of theseexperiments and the possible applications of this chamber are discussed. 相似文献
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本文从EAS横向分布的经验公式NKG结构函数及将平均值由NKG函数给定的Poisson分布用来对探测器实际测量到的粒子数密度进行随机抽样出发,利用蒙特卡罗模拟方法计算了梁王山宇宙线观测站粒子阵列的有效探测面积Aeff。由Aeff算出的EAS阵列的响应函数与实验观测结果相符合。将本文所得结果用于梁王山宇宙线测站的实验数据的分析,效果良好。 相似文献
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介绍了碱性镉镍蓄电池用作脉冲大电流恒流源的可行性,叙述了该类电池放电电流的规律和消除记忆效应的办法,并列出了用镉镍蓄电池组装有关恒流源样机的测试数据和实际考验结果。实验证明:在脉冲式大电流场合下,使用蓄电池作能源,可以消除常用的高功率脉冲源对市电电网的冲击,节省大量设备投资,获得具有高稳定度性能的恒流源。 相似文献
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坦克炮身管温度分布及红外辐射特性 总被引:2,自引:0,他引:2
对具有太阳辐射及受射击过程影响的坦克炮身管建立了温度及其红外辐射特性理论模型,并对以下三种情况进行了计算:坦克炮身管在太阳辐射一段时间后单发射击、太阳照射一段时间后多发慢速射击及太阳照射一段时间后多发射击。本文还分析讨论了各种情况下坦克炮身管外表面温度的变化规律及其对红外辐射特性的影响,对坦克整体红外辐射特性的研究具有重要意义。 相似文献
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