【作者】 祖秀兰； 娄本超； 周长庚； 伍春雷； 胡永宏；

【Author】 ZU Xiu-lan;LOU Ben-chao;ZHOU Chang-geng;WU Chun-lei;HU Yong-hong;Institute of Nuclear Physics and Chemistry,CAEP;

【机构】 中国工程物理研究院核物理与化学研究所；

【摘要】 强中子发生器于2006年建成。具有两条束线:直流束线可产生10 mA的直流束流;脉冲束线可产生纳秒脉冲束流。纳秒脉冲成形系统是脉冲束线的重要组成部分。纳秒脉冲成形系统获得纳秒脉冲的方式是先加速氘离子束,使其能量达到250 keV,然后进行扫描、切割和聚束的方式完成对离子束的脉冲化。由于聚束前离子束的能量较高,使得纳秒脉冲成形系统的设计难度大。为此,在结构设计上采用X、Y两个方向先进行扫描,来降低对聚束装置和高频电源的设计难度。采用正弦波速调管聚束理论和扫描切割理论计算确定了聚束器主要结构参数、扫描板主要结构参数和高频电源的相应参数,据此设计了聚束装置、扫描切割装置、高频电源系统,控制系统、束流测量系统。聚束装置采用的是三间隙双圆筒聚束器;扫描切割装置主要包括X扫描板、Y扫描板、切割缝;高频电源系统主要包括高频信号发生器、宽带放大器、频率相位自动微调装置、3个激励终端、供电电源系统;控制系统通过光纤传输信号,屏蔽高频干扰,实现远程计算机控制。束流测量系统采用脉冲法拉第筒接收脉冲束流,将脉冲信号转换为示波器可接收的电信号,由示波器测量观测脉冲波形。在脉冲束线和纳秒脉冲成形系统安装完成后,进行脉冲束流的调试,调试成功,测量获得了1.5~2.0 ns的聚束脉冲。脉冲束线投入运行以来,完成了中子飞行时间泄漏能谱等相关的实验。更多还原

【Abstract】 The Intense neutron generator was built in 2006.It has two transmission lines.One is DC line which can run 10 mA beam at most,another is pulse line which can burst nanosecond pulse.Nanosecond pulse forming system is an important component of pulse line.And d~+ beam is accelerated to 250 keV and pulse is obtained by scanning,bunching and cutting.High energy of the beam before bunching made it difficult to design the nanosecond pulse forming system.Therefore scanning in x and y directions was adopted in design to decrease the difficulty in design of bunch apparatus and RF source.Bunch theory of sine wave klystron and scan-cut theory were used to determine the main parameters of bunch device,scanning plates and RF source.Based on the calculation,bunch device,scanning plates RF source,as well as the control system and measurement system were designed and established.1.5 ~ 2.0ns pulse was obtained in test.Since the pulse line was put into use,some experiments have been done,namely leakage neutron TOF spectra of certain spheres.更多还原