Since the unexpected guiding effect of low energy ions by PET nanocapillaries was reported in the last decade[1], the self-organized charge-up on insulating surface is employed to realize a self-adaptive manipulation ...Since the unexpected guiding effect of low energy ions by PET nanocapillaries was reported in the last decade[1], the self-organized charge-up on insulating surface is employed to realize a self-adaptive manipulation of charged particle beams[2–4]. Considerable work (see Ref. [5] and references therein) has been done to investigate slow highly charged ions (SHCIs) interacting with inner surface of various insulating capillaries[5].展开更多
The guiding effect of 3 keV Ne7+ ions passing through an insulating PET nanocapillaries was found in 2002by N. Stolterfoht et al[1]. Since then considerable work[2] has been done to investigate slow highly charged ion...The guiding effect of 3 keV Ne7+ ions passing through an insulating PET nanocapillaries was found in 2002by N. Stolterfoht et al[1]. Since then considerable work[2] has been done to investigate slow highly charged ions(HCIs) interacting with inner surfaces of various insulating capillaries. It has been shown that the guiding effect isprevalent in the transmission of slow HCIs.Similar guiding phenomena were also observed for electrons transmitted through capillaries (see, e.g., Ref. [3-5]).However, the experiments showed that transmission efficiency of electrons was significantly lower than that of HCIs.Moreover, it revealed that portion of the transmitted electrons suffered significant energy-loss.展开更多
We propose the MCT measuring method^([1]).It promotes the image reconstruction methodology into the momentum space of the secondary particles produced in collision experiments.MCT pursues a projection-reconstruction s...We propose the MCT measuring method^([1]).It promotes the image reconstruction methodology into the momentum space of the secondary particles produced in collision experiments.MCT pursues a projection-reconstruction solution to the measurement problem.Firstly,the three-dimensional particle momentum is projected into a lowerdimensional position space in a programed way.This produces a series of projections consisting of curve-integral measurements in the particle momentum space.Then,the momentum distributions of included particle species are reconstructed from these integral measurements.展开更多
The Silicon Lab.at IMPCAS(SLIMP)from Quark Matter Research Center(QMRC)focuses on CMOS pixel sensor design and applications.In year of 2019,we have made the following major progresses.
When energetic heavy ions interact with atoms,molecules,clusters or solid targets,various secondary particles are generated.We proposed a novel imaging spectrometer,the Momentum Computed Tomography(MCT)[1].In brief,a ...When energetic heavy ions interact with atoms,molecules,clusters or solid targets,various secondary particles are generated.We proposed a novel imaging spectrometer,the Momentum Computed Tomography(MCT)[1].In brief,a series of two-dimensional position spectrums of the charged particles after flying through specific static electromagnetic fields are firstly obtained,which corresponds to a set of line-integral measurements of their momentum distributions;then the entire-solid-angle momentum distributions are reconstructed with these projections.Due to this working theory,no TOF is introduced in the measurement and the counting rate capability is only limited by the position sensitive detector.Thus,it combines the advantages of the modern imaging spectrometers that can image the entire-solid-angle momentum distribution,and the classical spectrometers that are suitable to intense reaction measurement if a proper detector is employed.展开更多
When energetic ions interact with solid surfaces,sputtered ions are produced[1].The normalized distribution function F(m,q,vx,vy,vz)of the ions mass numbers m,charge states q and velocity(vx,vy,vz)in Cartesian coordin...When energetic ions interact with solid surfaces,sputtered ions are produced[1].The normalized distribution function F(m,q,vx,vy,vz)of the ions mass numbers m,charge states q and velocity(vx,vy,vz)in Cartesian coordinate represents kinematical information,and therefore carries important dynamical information of the sputtering process.A new instrument that is able to collect all the outgoing sputtered ions with 2Πsolid angle and subsequently can measure F(m,q,vx,vy,vz)is developed.The spectrometer structure is illustrated,the mathematical basis is presented and an algebraic algorithm is employed to calculate F(m,q,vx,vy,vz)numerically.展开更多
采用不同材质的刻槽绝缘平行板,包括高纯度石英玻璃、聚四氟乙烯(Teflon)、酚醛树脂(电木)和聚甲醛板(赛钢板),并在15 p A/mm^2～14.3 n A/mm^2范围内改变入射流强,利用1 500 e V电子束入射上述绝缘平行板,实验研究了上述平行板对电子...采用不同材质的刻槽绝缘平行板,包括高纯度石英玻璃、聚四氟乙烯(Teflon)、酚醛树脂(电木)和聚甲醛板(赛钢板),并在15 p A/mm^2～14.3 n A/mm^2范围内改变入射流强,利用1 500 e V电子束入射上述绝缘平行板,实验研究了上述平行板对电子束的导向行为。实验发现,上述电子束通过上述平行板时存在明显的导向现象,其导向行为与束流流强和绝缘材质无关。据此,可排除绝缘平行板内表面沉积电荷自组织充放电过程中,以绝缘材料的面电阻和体电阻对地泄放的线性形式放电过程。展开更多
文摘Since the unexpected guiding effect of low energy ions by PET nanocapillaries was reported in the last decade[1], the self-organized charge-up on insulating surface is employed to realize a self-adaptive manipulation of charged particle beams[2–4]. Considerable work (see Ref. [5] and references therein) has been done to investigate slow highly charged ions (SHCIs) interacting with inner surface of various insulating capillaries[5].
文摘The guiding effect of 3 keV Ne7+ ions passing through an insulating PET nanocapillaries was found in 2002by N. Stolterfoht et al[1]. Since then considerable work[2] has been done to investigate slow highly charged ions(HCIs) interacting with inner surfaces of various insulating capillaries. It has been shown that the guiding effect isprevalent in the transmission of slow HCIs.Similar guiding phenomena were also observed for electrons transmitted through capillaries (see, e.g., Ref. [3-5]).However, the experiments showed that transmission efficiency of electrons was significantly lower than that of HCIs.Moreover, it revealed that portion of the transmitted electrons suffered significant energy-loss.
文摘We propose the MCT measuring method^([1]).It promotes the image reconstruction methodology into the momentum space of the secondary particles produced in collision experiments.MCT pursues a projection-reconstruction solution to the measurement problem.Firstly,the three-dimensional particle momentum is projected into a lowerdimensional position space in a programed way.This produces a series of projections consisting of curve-integral measurements in the particle momentum space.Then,the momentum distributions of included particle species are reconstructed from these integral measurements.
文摘The Silicon Lab.at IMPCAS(SLIMP)from Quark Matter Research Center(QMRC)focuses on CMOS pixel sensor design and applications.In year of 2019,we have made the following major progresses.
文摘When energetic heavy ions interact with atoms,molecules,clusters or solid targets,various secondary particles are generated.We proposed a novel imaging spectrometer,the Momentum Computed Tomography(MCT)[1].In brief,a series of two-dimensional position spectrums of the charged particles after flying through specific static electromagnetic fields are firstly obtained,which corresponds to a set of line-integral measurements of their momentum distributions;then the entire-solid-angle momentum distributions are reconstructed with these projections.Due to this working theory,no TOF is introduced in the measurement and the counting rate capability is only limited by the position sensitive detector.Thus,it combines the advantages of the modern imaging spectrometers that can image the entire-solid-angle momentum distribution,and the classical spectrometers that are suitable to intense reaction measurement if a proper detector is employed.
文摘When energetic ions interact with solid surfaces,sputtered ions are produced[1].The normalized distribution function F(m,q,vx,vy,vz)of the ions mass numbers m,charge states q and velocity(vx,vy,vz)in Cartesian coordinate represents kinematical information,and therefore carries important dynamical information of the sputtering process.A new instrument that is able to collect all the outgoing sputtered ions with 2Πsolid angle and subsequently can measure F(m,q,vx,vy,vz)is developed.The spectrometer structure is illustrated,the mathematical basis is presented and an algebraic algorithm is employed to calculate F(m,q,vx,vy,vz)numerically.
文摘采用不同材质的刻槽绝缘平行板,包括高纯度石英玻璃、聚四氟乙烯(Teflon)、酚醛树脂(电木)和聚甲醛板(赛钢板),并在15 p A/mm^2～14.3 n A/mm^2范围内改变入射流强,利用1 500 e V电子束入射上述绝缘平行板,实验研究了上述平行板对电子束的导向行为。实验发现,上述电子束通过上述平行板时存在明显的导向现象,其导向行为与束流流强和绝缘材质无关。据此,可排除绝缘平行板内表面沉积电荷自组织充放电过程中,以绝缘材料的面电阻和体电阻对地泄放的线性形式放电过程。
