Fast mechanical shutter for pulsed ion beam generation

Chen, A.X.; Antolak, Arlyn J.; Leung, K. N.; Morse, D.H.; Raber, Thomas

doi:10.1016/j.nima.2011.12.031

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Another merit of the HD impact is that the signal is more significant and easier to analyze. However, experimental generation of the pulse of a group of ions may require a very strong ion source [Volkert and Minor, 2007] and a special "shutter" [Chen et al, 2012] to regulate the arrival time of different ions. LD impact can be achieved easily by regular FIBs [Volkert and Minor, 2007] as the common operating beam current around 0.028 nA to 28 nA corresponds to large gaps between the landing of sequential ions.…”

Section: Strain and Strain Rate In Sample And Sensor Layersmentioning

confidence: 99%

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

Chen

Yao

et al. 2016

Int. J. Appl. Mechanics

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Strain rate is essential in study of the physics of fluids and solids undergoing deformation. State-of-art high strain rate tests have mainly been in macro-scale with an upper limit of [Formula: see text]. A graphene-based layered system is proposed to conduct nanometer-scale high strain rate testing. The process is investigated by molecular dynamics simulations. Accelerated single ion or group of ions are used to impact on the proposed system to generate ballistic or plate-like impact scenarios. The effects of impact energy, shape of impact absorber and the impaction location are investigated. The graphene layer is the key of the proposed system to spread the load and protect the sample. The results indicate that ion group and single ion impacts produce strain rates of [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text], respectively. Ion group impact produces a more significant signal than single ion impact on the sensing nano-layer in the system. The ultimate strength of an Al-Cu alloy sample during ion impact is estimated to be 215[Formula: see text]MPa to 251[Formula: see text]MPa, significantly lower than predicted by the Johnson–Cook model because of the rapidly increased temperature and melting in the sample. The results demonstrate new possibilities for understanding high strain rate effects at nano-scale.

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Section: Strain and Strain Rate In Sample And Sensor Layersmentioning

confidence: 99%

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

Chen

Yao

et al. 2016

Int. J. Appl. Mechanics

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“…This material removal method based on duty cycle adjustment enables the motion axis to move uniformly during the processing [ 14 , 15 , 16 ], completely avoids the restriction of the acceleration of the machine tool motion axis and reduces the requirement for the dynamic performance of the machine tool while having high machining convergence ability [ 17 , 18 , 19 ]. Previously, Zhou et al [ 13 ] only validated the stability and linearity of the PIB removal function; its actual shaping ability and advantages were not verified.…”

Section: Introductionmentioning

confidence: 99%

Figuring Method of High Convergence Ratio for Pulsed Ion Beams Based on Frequency-Domain Parameter Control

et al. 2022

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The continuous phase plate (CPP) provides excellent beam smoothing and shaping impacts in the inertial confinement fusion application. However, due to the features of its dispersion, its surface gradient is frequently too large (>2 μm/cm) to process. When machining a large gradient surface with continuous ion beam figuring (IBF), the acceleration of the machine motion axis cannot fulfill the appropriate requirements, and the machining efficiency is further influenced by the unavoidable extra removal layer. The pulsed ion beam (PIB) discretizes the ion beam by incorporating frequency-domain parameters, resulting in a pulsed beam with a controlled pulse width and frequency and avoiding the extra removal layer. This research evaluates the processing convergence ability of IBF and PIB for the large gradient surface using simulation and experiment. The findings reveal that PIB offers obvious advantages under the same beam diameter. Compared with the convergence ratio (γ = 2.02) and residuals (RMS = 184.36 nm) of IBF, the residuals (RMS = 27.48 nm) of PIB are smaller, and the convergence ratio (γ = 8.47) is higher. This work demonstrates that PIB has better residual convergence in large gradient surface processing. It is expected to realize ion beam machining with a higher convergence ratio.

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Fast mechanical shutter for pulsed ion beam generation

Cited by 2 publications

References 8 publications

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

Figuring Method of High Convergence Ratio for Pulsed Ion Beams Based on Frequency-Domain Parameter Control

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