一种高精度低晃动可控延迟电路的设计和实现

介绍了一种可控延迟电路设计,具有精度高,晃动低,可调范围宽,低功耗的特点.延迟电路采用粗延迟和细延迟分别控制的方案,采用不同的粗延迟芯片可以达到不同的最大可调延迟范围,而细延迟的调节步长可以达到10 ps,整个电路的晃动小于100 ps,由此电路构成的延迟插件已成功地应用在量子密钥分发的实验中.     

晃动补偿精密时序控制电路设计

针对目前多路同步控制技术在外触发工作状态下输出信号晃动较大且延时时间分辨低的问题,提出一种具有晃动补偿功能的精密时序控制方法。该方法采用FPGA作为核心控制器对输入触发信号与本地时钟之间晃动进行精确测量,再利用可编程模拟延时芯片实现晃动测量结果实时补偿,从而抑制两者之间的随机晃动。实验表明:该方法可以在ns到百μs量级时间范围内,将外触发信号与时钟基准信号之间的晃动控制在330 ps以内。     

惯性约束核聚变实验中子飞行时间谱仪的时间测量插件

大型的惯性约束核聚变(ICF)设施都采用中子飞行时间(nTOF)探测系统测量离子温度.大阵列中子探测器系统作为国际上使用的最主要探测手段,已成为ICF诊断平均密度半径积<ρR>的标准技术.用于"神光Ⅲ"原型及主机的灵敏中子探测器阵列的时间分辨期望达到1 ns,为此探测器后的电子学系统的时间分辨期望达到100 ps.采用ACAM公司的GP2作为时间测量插件的核心芯片,我们研制了基于VME总线的多通道TDC时间测量插件,其时间分辨小于61 ps.     

基于精度延时技术的脉冲同步机研制

介绍的高精度延时同步机延时范围在0～99μs(最小步进1ns)内可调;延时输出幅度≥ 50V;延时输出宽度≥100ns;延时输出前沿≤3ns;延时时间晃动≤5ns.     

亚纳秒触发脉冲延时分配器设计

介绍了上海光源储存环注入系统冲击磁铁定时触发脉冲延时分配器的设计和研制。采用可控专用延时芯片设计了该触发脉冲延时分配器,实现1路光脉冲输入,4路延时独立可调的快前沿低抖动电脉冲输出,输出脉冲延时调整步长0.25 ns、可调延时范围64 ns。除具有延时功能外,还具有联锁保护、输出脉冲状态、联锁输入状态显示等功能,不仅可以通过仪器面板操作,还可以通过RS232接口遥控。     

一个16通道程控时间延尺的VME插件

本文介绍了一人１６通道的程控时间延迟ＶＭＥ插件，该插件将用以正在日本高能物理国家实验室建造的ＢＥＬＬＥ探测器的触发系统，其延迟信号的时间晃动的均方根值小于３００ｐｓ。     

惯性约束聚变实验中全程控终端同步机的研制

基于VXI总线系统设计了用于惯性约束聚变(ICF)实验的中等精度全程控终端同步机,可以对输出延时、幅度、极性、脉宽全面程控,并进行了性能指标测试.测试表明:该同步机固有延时小于30 ns,大信号输出脉冲前沿小于14 ns,时间抖动小于5 ns,满足了ICF实验对终端同步机的要求.     

一个 16 通道程控时间延迟的 VME 插件

本文介绍了一个１６通道的程控时间延迟ＶＭＥ插件。该插件将用以正在日本高能物理国家实验室建造的ＢＥＬＬＥ探测器的触发系统，其延迟信号的时间晃动的均方根值小于３００ｐｓ。     

TOF测量系统读出电子学时钟插件设计

介绍了中国科学院近代物理研究所反应显微成像谱仪和重离子加速器冷却储存环内靶实验中,测量粒子飞行时间读出电子学的时钟插件。两个时钟插件分别集成于3UPXI插件和6UPXI插件上,利用高精度的时钟源和时钟扇出芯片为飞行时间读出电子学系统提供高精度的系统时钟,其抖动分别小于11ps(RMS)和12ps(RMS),满足设计要求。     

5.12 Gbps高速抗辐照并串转换芯片的设计

本文介绍了一种用于粒子物理实验的抗辐照高速并串转换电路芯片的设计,重点介绍了SOS抗辐照工艺,并串转换电路的结构。实现了一款基于SOS 0.25um工艺的8位5.12Gbps并串转换芯片,测试得到芯片的总晃动(total jitter)=53.20ps,其中随机晃动(random jitter)=1.84ps,确定性晃动(deterministic jitter)=33.93ps。     

High Speed HPD for Photon Counting

We have succeeded in the development of a high-speed Hybrid Photodetector (HPD), by using a reduced electron lens and a newly developed avalanche diode (AD) with very low capacitance. The HPD shows fast time response of less than 500 ps in both rise and fall times, and good timing resolution of 26 ps (one sigma) for single photons at full illumination on a photocathode 8 mm in diameter. Limiting factors of the timing resolution were further investigated, and were found to be the transit time difference of electrons in vacuum along the photocathode and the jitter of the electronics. The timing resolution is 15 ps for illumination of less than 5 mm on the central part of the photocathode, which includes the jitter of 13 ps from the electronics. This resolution is the world's highest for HPDs, and matches the resolution of MCP-PMTs. Both a GaAsP photocathode having close to 50% quantum efficiency in the visible and a bialkali photocathode having 34% QE in the UV were fabricated in view of making this device available for various applications. In this paper, we report the results of our evaluation, including discussion about the limiting factors of the timing resolution for the new HPD.     

A low-jitter self-triggered spark-discharge pre-ionization switch:primary research on its breakdown characteristics and working mechanisms

MV pulsed switch plays a key role as the transfer switch in large electromagnetic pulse simulators.To broaden the range of self-triggering time,a novel spark-discharge pre-ionization switch,in which the main gap electric field is superposed at the trigger gap to let the electrons in its spark channel also become initial electrons,is proposed and tested.The design idea is:as electrons in the spark channel of the trigger gap always exist after its breakdown,the injection time of pre-ionization should have a more negligible effect on reducing the switch jitter.The experiment results under pulses with a rise time of～100 ns support the above assumptions.When the operating voltage is from～300 to～800 kV and the self-triggering time is～45％to～75％of the peak time,the breakdown time delay jitter is less than 2 ns,and the breakdown voltage jitter is smaller than 1.25％.Under specific self-triggering time,the breakdown time delay jitter is less than 1.5 ns,and the breakdown voltage jitter is smaller than 0.8％.     

高精度可编程双脉冲产生器

介绍了一种用于高精度ＴＤＣ测量的双脉冲产生器,该产生器可提供ＴＤＣ所需的ｓ和ｓｔｏｐ脉冲,两个脉冲之间的时间间隔有１４位精度,时间晃动小于１３ｐｓ,可通过一选择不同的动态范围。     

基于FPGA的时间间隔测量设计与实现

本文主要介绍了一种基于FPGA的高精度时间-数字转换器(TDC)。该TDC在设计上采用了粗计数与细时间测量相结合的技术。粗计数通过高性能的二进制计数器实现,细时间测量利用FPGA的快速进位链实现时间内插。为了改善测量分辨,在设计中借助Wave-Union方法对超大码宽进行了分割。为检验TDC的性能,对其进行了多项测试,获得较好的测试结果。该TDC在大于200ms的动态范围内的时间分辨率小于50ps。微分非线性(DNL)的范围为-1~1.5LSB,积分非线性(INL)的范围为-1.5~1.5LSB。该TDC将应用于In-beam PET影像装置中的飞行时间测量。     

基于FPGA与GPS的时间测量电路设计与实现

为宇宙射线缪子（μ子）测量实验设计了基于FPGA的高精度时间-数字转换器（TDC），结合TDC测量值与GPS提供的标准时间(UTC)精确记录了粒子事件的时间信息。TDC采用粗计数+细时间测量相结合的方式，用计数器实现动态范围大于1 s的粗时间测量；使用FPGA加法进位延时链构建时间内插完成了细时间测量，并借助Wave-Union与bin-by-bin方法提高时间分辨并改善非线性。实验室测试双边沿TDC的时间分辨为16.68 ps，时间测量精度（RMS）好于45 ps。测量结果表明，该TDC满足脉冲前沿时间甄别要求。     

BELLE物理实验DAQ系统中的精确时序调整

介绍了一个基于ＥＣＬｉｎＰＳ电路产生高精度程控延时脉冲信号的ＶＭＥ插件,该插件将用于ＢＥＬＬＥ物理实验ＤＡＱ系统中的精确时序调整,产生分辨率为１０ｎｓ的时序控制符号,其时间抖动的均方根值小于１００ｐｓ。     

Event-driven timing system based on MRF cPCI hardware for HLS-II

Hefei Light Source(HLS)-II is a vacuum ultraviole(VUV) synchrotron light source. A major upgrade of the light source was finished at the end of 2014. The timing system was rebuilt using compact peripheral component interconnect(cPCI) event-driven hardware to meet synchronization requirements of the machine. In the new system, the c PCI event-driven products manufactured by the micro-research finland(MRF) Oy are employed to achieve about 100 output signals with different interfaces. Device supports and drivers developed for common Experimental Physics and Industrial Control System(EPICS) records are used to access the registers on the timing modules. Five c PCI-bus input/output controllers(IOCs) distributed in different areas of the light source host timing modules for various subsystems. The delay resolution of this system is 9.8 ns for most channels and 9 ps for the channels used for triggering the electron gun and the injection kickers. The measured rms jitter of the output signal is less than 27 ps. Using the bucket chooser, this system enables the HLS-II to fill the storage ring with any designated bunch pattern. Benefitting from this upgrade, brightness and performance of the light source are significantly improved.     

Comparison of the timing properties of the new Philips components(Amperex) XP2020/UR photomultiplier and the XP2020 photomultiplier

Timing characteristics are measured for the Philips Components (Amperex) XP2020/UR photomultiplier. The transit time jitter is significantly better than that of previously available XP2020 tubes. In a study of the transit time jitter, a single photoelectron resolution of 286±3 ps was obtained for the XP2020 and 190±2 ps for the XP2020/UR