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Transverse modes and instabilities of a bunched beam with space charge and resistive wall impedance
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Independent component analysis applied to long bunch beams in the Los Alamos Proton Storage Ring
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Longitudinal dynamics of twin electron bunches in the Linac Coherent Light Source
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Transverse space-charge induced microbunching instability in high-brightness electron bunches
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Simulation of transverse modes with their intrinsic Landau damping for bunched beams in the presence of space charge
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Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration
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Optical plasma torch electron bunch generation in plasma wakefield accelerators
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Operational experience with nanocoulomb bunch charges in the Cornell photoinjector
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Flexible pulse delay control up to picosecond for high-intensity twin electron bunches
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Long bunch trains measured using a prototype cavity beam position monitor for the Compact Linear Collider
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Characterization of pseudosingle bunch kick-and-cancel operational mode
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Laser-Accelerated, Low-Divergence 15-MeV Quasimonoenergetic Electron Bunches at 1 kHz
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High-speed X-ray imaging pixel array detector for synchrotron bunch isolation
A wide-dynamic-range imaging X-ray detector designed for recording successive frames at rates up to 10 MHz is described. X-ray imaging with frame rates of up to 6.5 MHz have been experimentally verified. The pixel design allows for up to 8–12 frames to be stored internally at high speed before readout, which occurs at a 1 kHz frame rate. An additional mode of operation allows the integration capacitors to be re-addressed repeatedly before readout which can enhance the signal-to-noise ratio of cyclical processes. This detector, along with modern storage ring sources which provide short (10–100 ps) and intense X-ray pulses at megahertz rates, opens new avenues for the study of rapid structural changes in materials. The detector consists of hybridized modules, each of which is comprised of a 500 µm-thick silicon X-ray sensor solder bump-bonded, pixel by pixel, to an application-specific integrated circuit. The format of each module is 128 × 128 pixels with a pixel pitch of 150 µm. In the prototype detector described here, the three-side buttable modules are tiled in a 3 × 2 array with a full format of 256 × 384 pixels. Lastly, we detail the characteristics, operation, testing and application of the detector.
Characterization of the LCLS “nanosecond two-bunch” mode for x-ray speckle visibility spectroscopy experiments
The generation of two X-ray pulses with tunable nanosecond scale time separations has recently been demonstrated at the Linac Coherent Light Source using an accelerator based technique. This approach offers the opportunity to extend X-ray Photon Correlation Spectroscopy techniques to the yet unexplored regime of nanosecond timescales by means of X-ray Speckle Visibility Spectroscopy. As the two pulses originate from two independent Spontaneous Amplified Stimulated Emission processes, the beam properties fluctuate from pulse pair to pulse pair, but as well between the individual pulses within a pair. However, two-pulse XSVS experiments require the intensity of the individual pulses to be either identical in the ideal case, or with a accurately known intensity ratio. We present the design and performances of a non-destructive intensity diagnostic based on measurement of scattering from a transparent target using a high-speed photo-detector. Individual pulses within a pulse pair with time delays as short as 0.7 ns can be resolved. Moreover, using small angle coherent scattering, we characterize the averaged spatial overlap of the focused pulse pairs. Furthermore, the multi-shot average-speckle contrasts from individual pulses and pulse pairs are compared.