为满足硅微条探测器研制的需求,本文研制了一款多通道低噪声电荷灵敏前放ASIC芯片。设计完成电荷灵敏前置放大电路和极零相消电路;并分析电路的积分非线性、噪声斜率、可靠性等指标参数。该电荷灵敏前放输入动态范围20~830 f C时,等效...为满足硅微条探测器研制的需求,本文研制了一款多通道低噪声电荷灵敏前放ASIC芯片。设计完成电荷灵敏前置放大电路和极零相消电路;并分析电路的积分非线性、噪声斜率、可靠性等指标参数。该电荷灵敏前放输入动态范围20~830 f C时,等效输入噪声为685.73+32.37 e-rms/p F。展开更多
针对塑料闪烁体阵列探测器(Plastic Scintillation Detector,PSD)低功耗、数字化的读出需求,研制了一款多通道10 bit 20 MSPS流水线型模数变换器(Analog-to-Digital Converter,ADC)芯片。为了评估该ADC芯片的性能参数,需要对其进行系统...针对塑料闪烁体阵列探测器(Plastic Scintillation Detector,PSD)低功耗、数字化的读出需求,研制了一款多通道10 bit 20 MSPS流水线型模数变换器(Analog-to-Digital Converter,ADC)芯片。为了评估该ADC芯片的性能参数,需要对其进行系统化的测试。首先研制了一套测试系统,包括电路的硬件设计、FPGA固件和分析程序的设计,然后依据IEEE标准对ADC芯片进行了系统化的测试与分析。测试结果表明,输入信号在基带范围内,ADC芯片测试参数达到了预期指标,有效位数(Effective Number of Bit,ENOB)接近于8.0 bit,积分非线性(INL)=0.75LSB,微分非线性(DNL)=1.09LSB,为后续ADC芯片的优化设计和参数提升提供了有力的支持。展开更多
The ^(12)C+^(12)C fusion reaction was studied in the range of E_(c.m.)=8.9 to 21 MeV using the active-target Time Projection Chamber.With full information on all tracks of the reaction products,cross sections of the^(...The ^(12)C+^(12)C fusion reaction was studied in the range of E_(c.m.)=8.9 to 21 MeV using the active-target Time Projection Chamber.With full information on all tracks of the reaction products,cross sections of the^(12)C(^(12)C,^(8)Be)^(16)O_(g.s.)channel and the ^(12)C(^(12)C,3a)^(12)C channel could be measured down to the level of a few milibarns.The ^(12)C(^(12)C,^(8)Be)^(16)O_(g.s.)reaction channel was determined to be 10_(-8)^(+24) mb at E_(c.m.)=11.1 MeV,supporting the direct a transfer reaction mechanism.The ^(12)C(^(12)C,3α)^(12)C reaction channel was studied for the first time using an exclusive measurement.Our result does not confirm the anomaly behavior reported in the previous inclusive measurement by Kolata et al.[Phys.Rev.C 21,579(1980)].Our comparisons with statistical model calculations suggest that the 3 a channel is dominated by the fusion evaporation process at E_(c.m.)>19 MeV.The additional contribution of the 3 a channel increases the fusion reaction cross section by 10% at energies above 20 MeV.We also find that an additional reaction mechanism is needed to explain the measured cross section at E_(c.m.)<15 MeV at which point the statistical model prediction vanishes.展开更多
文摘为提升平行板雪崩计数器(PPAC)的使用性能,设计了一款具有50 ns和100 ns两档达峰时间的四通道滤波成形专用集成电路(ASIC)芯片。该ASIC芯片与已有的前放芯片结合可实现PPAC的信号读出。芯片内每个通道包括极零相消、低通滤波成形及输出电路。输入动态范围-0.8^+0.8 V内的线性度达到0.2%;-3 d B带宽噪声不高于60μV;芯片功耗30 m W;面积为2.6 mm×1.25 mm。
文摘针对塑料闪烁体阵列探测器(Plastic Scintillation Detector,PSD)低功耗、数字化的读出需求,研制了一款多通道10 bit 20 MSPS流水线型模数变换器(Analog-to-Digital Converter,ADC)芯片。为了评估该ADC芯片的性能参数,需要对其进行系统化的测试。首先研制了一套测试系统,包括电路的硬件设计、FPGA固件和分析程序的设计,然后依据IEEE标准对ADC芯片进行了系统化的测试与分析。测试结果表明,输入信号在基带范围内,ADC芯片测试参数达到了预期指标,有效位数(Effective Number of Bit,ENOB)接近于8.0 bit,积分非线性(INL)=0.75LSB,微分非线性(DNL)=1.09LSB,为后续ADC芯片的优化设计和参数提升提供了有力的支持。
基金Supported in part by the Strategic Priority Research Program of Chinese Academy of Sciences(XDB34020200)the National Key Research and Development program(MOST 2016YFA0400501)from the Ministry of Science and Technology of China+2 种基金the State Key Laboratory of Nuclear Physics and Technology,PKU(NPT2020KFY06)the National Natural Science Foundation of China(U1632142,12175156),the National Natural Science Foundation of China(11905260)the Western Light Project of Chinese Academy of Sciences。
文摘The ^(12)C+^(12)C fusion reaction was studied in the range of E_(c.m.)=8.9 to 21 MeV using the active-target Time Projection Chamber.With full information on all tracks of the reaction products,cross sections of the^(12)C(^(12)C,^(8)Be)^(16)O_(g.s.)channel and the ^(12)C(^(12)C,3a)^(12)C channel could be measured down to the level of a few milibarns.The ^(12)C(^(12)C,^(8)Be)^(16)O_(g.s.)reaction channel was determined to be 10_(-8)^(+24) mb at E_(c.m.)=11.1 MeV,supporting the direct a transfer reaction mechanism.The ^(12)C(^(12)C,3α)^(12)C reaction channel was studied for the first time using an exclusive measurement.Our result does not confirm the anomaly behavior reported in the previous inclusive measurement by Kolata et al.[Phys.Rev.C 21,579(1980)].Our comparisons with statistical model calculations suggest that the 3 a channel is dominated by the fusion evaporation process at E_(c.m.)>19 MeV.The additional contribution of the 3 a channel increases the fusion reaction cross section by 10% at energies above 20 MeV.We also find that an additional reaction mechanism is needed to explain the measured cross section at E_(c.m.)<15 MeV at which point the statistical model prediction vanishes.
