Pico-coulomb charge measured at BELLA to percent-level precision using a Turbo-ICT

Nakamura, Kei; Mittelberger, D. E.; Gonsalves, A. J.; Daniëls, J.; Mao, Hann-Shin; Stulle, F.; Bergoz, J.; Leemans, Wim

doi:10.1088/0741-3335/58/3/034010

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…The laser beam is focused in the leading edge of a 4 × 1 mm rectangular supersonic nozzle along the longer direction. The charge of electron bunch is measured by Turbo Integrating Current Transformer (Turbo‐ICT) [ 22 ] out of 100 μm beryllium (Be) window. The energy spectra of electron bunch are analyzed by a magnetic spectrometer with field intensity of 0.8 T, which permits a detection range of minimal energy of 68 MeV while keeping an acceptable resolution in 300 MeV.…”

Section: Results Ans Discussionmentioning

confidence: 99%

Direct Imaging with Hundreds of MeV Electron Bunches from Laser Wakefield Acceleration

Cai

et al. 2020

Physica Status Solidi (a)

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Direct imaging is a key tool for diagnostics of density transition in different material composition. Ultrafast electron bunches from 100 TW‐level laser system are attractive in future applications. Experiments for direct imaging with 100 MeV electrons are conducted using a 200 TW laser facility in Peking University. Electron bunches with energy spectra ranging from 100 to 150 MeV are achieved with a mixture gas of 0.5% nitrogen and 99.5% helium. Herein, the contrast imaging, transmission, and slit experiments are conducted and analyzed. It turns out the superiority of the hundreds of MeV electrons in thick material imaging applications. It is also anticipated that this technology can be used for ultrafast dynamic analysis with the advent of higher charge electrons in a single ultrafast bunch from laser‐driven electron accelerators.

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Section: Results Ans Discussionmentioning

confidence: 99%

Direct Imaging with Hundreds of MeV Electron Bunches from Laser Wakefield Acceleration

Cai

et al. 2020

Physica Status Solidi (a)

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“…Further research showed that residual EMP within a narrow frequency bandwidth was the primary limit on ICT sensitivity for Q < 5 pC. Frequency filtering of the ICT's signal processing electronics improved sensitivity to the sub-pC level, while improving noise immunity and retaining excellent cross-calibration with other detectors (Nakamura et al, 2016). The filtered ICT has been marketed, an example of commercial product development spurred by plasma accelerator diagnostics research.…”

Section: Total and Spatially-resolved Charge Measurementmentioning

confidence: 99%

“…The dipole magnet spectrometer (Brown, 1975) is the workhorse for single-shot measurement of electron energy spectra both in conventional (Brown, 1975) and plasmabased (Glinec et al, 2006;Nakamura et al, 2008;Sears et al, 2010b) accelerators. Plasma-based electron accelerators, however, pose two special challenges.…”

Section: Mev and Gev Magnetic Spectrometersmentioning

confidence: 99%

“…Shifts in the object plane towards the magnet entrance (equivalent to a divergent incoming beam) simply shift the image plane. Resolution is thus limited only by the (negligible) source size in the object plane or by aberrations in the focusing field (Nakamura et al, 2008;Sears et al, 2010b). Electrons of somewhat higher energy E 2 exit the magnetic field at an oblique angle.…”

Section: Mev and Gev Magnetic Spectrometersmentioning

confidence: 99%

“…Alternatively, much larger magnets can be used -e.g. a circular 1.25 T field of 40 cm diameter was used to characterize 4 GeV LWFA electrons (Leemans et al, 2014;Nakamura et al, 2008).…”

Section: Mev and Gev Magnetic Spectrometersmentioning

confidence: 99%

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Diagnostics for plasma-based electron accelerators

et al. 2018

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Plasma-based accelerators that impart energy gain as high as several GeV to electrons or positrons within a few centimeters have engendered a new class of diagnostic techniques very different from those used in connection with conventional radio-frequency (RF) accelerators. The need for new diagnostics stems from the micrometer scale and transient, dynamic structure of plasma accelerators, which contrasts with the meter scale and static structure of conventional accelerators. Because of this micrometer source size, plasma-accelerated electron bunches can emerge with smaller normalized transverse emittance (n < 0.1 mm mrad) and shorter duration (τ b ∼ 1 fs) than bunches from RF linacs. We review single-shot diagnostics that determine such small n and τ b non-invasively and with high resolution from wide-bandwdith spectral measurement of electromagnetic radiation the electrons emit: n from x-rays emitted as electrons interact with transverse internal fields of the plasma accelerator or with external optical fields or undulators; τ b from THz to optical coherent transition radiation emitted upon traversing interfaces. The duration of ∼ 1 fs bunches can also be measured by sampling individual cycles of a co-propagating optical pulse or by measuring the associated magnetic field using a transverse probe pulse. Because of their luminal velocity and micrometer size, the evolving structure of plasma accelerators, the key determinant of accelerator performance, is exceptionally challenging to visualize in the laboratory. Here we review a new generation of laboratory diagnostics that yield snapshots, or even movies, of laser-and particle-beam-generated plasma accelerator structures based on their phase modulation or deflection of femtosecond electromagnetic or electron probe pulses. We discuss spatiotemporal resolution limits of these imaging techniques, along with insights into plasma-based acceleration physics that have emerged from analyzing the images, and comparing them to simulated plasma structures. CONTENTS I.Introduction 1 II. Properties of plasma accelerator structures and beams 3 A. General properties of plasma electron accelerators 3 1. Frequency-domain holography 41 2. Longitudinal optical shadowgraphy 45 3. Transverse optical probing 46 4. Electron radiography 48 D. "Movies" of wake evolution 49 1. Multi-shot transverse probes 49 2. Single-shot frequency-domain streak camera 50 3. Single-shot imaging of meter-long wakes 52 E. Scaling of wake probes with plasma density 54 V. Conclusion 55 References 58

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Non-destructive sub-picocoulomb charge measurement for laser-plasma accelerators

Nakamura¹,

Mittelberger²,

Gonsalves³

et al. 2017

AIP Conference Proceedings

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Pico-coulomb charge measured at BELLA to percent-level precision using a Turbo-ICT

Cited by 9 publications

References 14 publications

Direct Imaging with Hundreds of MeV Electron Bunches from Laser Wakefield Acceleration

Direct Imaging with Hundreds of MeV Electron Bunches from Laser Wakefield Acceleration

Diagnostics for plasma-based electron accelerators

Non-destructive sub-picocoulomb charge measurement for laser-plasma accelerators

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