Neutron camera is widely employed for measuring the neutron emission profile to assess the neutron emissivity at different spatial *** measured neutron emission profile can in principle provide an image of the fusion ...
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Neutron camera is widely employed for measuring the neutron emission profile to assess the neutron emissivity at different spatial *** measured neutron emission profile can in principle provide an image of the fusion source from which its location,shape and yield can be determined,and also help to develop an understanding of fast ion physics in tokamak *** camera devices have been installed on JET,TFTR,JT-60 U,FTU and *** is also one of the main diagnostic systems planned for the International Thermonuclear Experiment Reactor(ITER).Nowadays,a new horizontal neutron camera with nine channels has been developed and installed on the HL-2 A *** work describes the development and characterization of the detector assembly and the data acquisition system of the neutron camera at HL-2 A for measuring spatial and time resolved 2.45 Me V neutrons generated by deuterium-deuterium fusion *** detector assembly consists of nine channels d on liquid scintillators(BC501 A).The energy calibration is performed for all the channels with gamma sources and six quasi-monoenergetic neutron fields produced by nuclear reactions through a 4.5 MV Van de Graaff *** of the nine liquid scintillation detectors equipped with a LED gain monitoring system aimed at evaluating the gain variation is coupled into a fast digitizer used for neutron/gamma-ray digital pulse shape *** digitizer data acquisition system with sampling rate of 1 GHz can work under environment with high count rate at HL-2 *** trace of the neutron emissivity measured by the detectors is consistent with the result of a standard 235 U fission chamber in HL-2 A plasma discharge *** codes of neutron emission profile reconstruction d on Tikhonov regulation and Maximum Likelihood methods were developed and the performances of the two methods were compared for different preset neutron emission *** regulation has shown better capabi
SSC-LINAC是为兰州重离子研究装置(HIRFL)设计的直线注入器,它将U34+离子加速到1 Me V/u注入到分离扇回旋加速器(SSC)中,为冷却储存环(CSR)提供10 Me V/u的U34+。该注入器可以将SSC引出的重离子流强提高一个量级以上。SSC-LINAC由一个RF...
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SSC-LINAC是为兰州重离子研究装置(HIRFL)设计的直线注入器,它将U34+离子加速到1 Me V/u注入到分离扇回旋加速器(SSC)中,为冷却储存环(CSR)提供10 Me V/u的U34+。该注入器可以将SSC引出的重离子流强提高一个量级以上。SSC-LINAC由一个RFQ(Radio Frequency Quadrupole)加速器和4个DTL(drift tube linac)组成,设计频率为53.667 MHz。RFQ工作在连续波模式,设计功率30 k W,如果不能有效地冷却,高频电流在电极表面产生的热量会使RFQ的腔壁和电极发生形变,从而导致腔体频率的漂移以及加速和聚焦电场的改变。因此,为了保证连续波工作的RFQ加速器稳定运行,对水冷模式和通道设计提出了很高的要求。作者用有限元软件ANSYS对RFQ进行高频电磁场、温度场、结构应力的耦合分析,验证了冷却方案设计的可行性和可靠性。
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