A compact, high resolution energy, and emittance diagnostic for electron beams using active plasma lenses

Barber, Sam; Ji, Bin; Gonsalves, A. J.; Isono, Fumika; Tilborg, J. van; Steinke, S.; Nakamura, Kei; Zingale, Anthony; Czapla, Nick; Schumacher, Douglass; Schroeder, Carl; Geddes, C. G. R.; Leemans, Wim; Esarey, E.

doi:10.1063/5.0005114

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…The transport effects up to the second order and the space charge are considered in the simulation. By adjusting the relative position between the two permanent magnetic quadrupoles and the magnetic field gradient of the electromagnetic quadrupole, the focused beamline was optimized with a cancelling term for the central energy electrons (~500 MeV) to a waist [ 10 , 35 ] . The element in the transfer matrix then represents the magnification of the transverse beam size, which is estimated to be –11 in the presented beamline and is sufficient for the high-precision measurement of the energy-resolved sizes.…”

Section: Resultsmentioning

confidence: 99%

“…Neglecting the evolution as the electron beam leaves the bubble will make the measured result deviate from its true emittance [ 34 ] . In comparison, the direct energy-dispersed measurement method using a focused beam transfer line and an energy spectrometer has greater feasibility, and is suitable for low-charge electron beam diagnostics [ 10 , 35 ] . Unlike the early quadrupole scanning method [ 36 ] , the electron beam has energy-dependent transverse deflection through the dipole, which separates the influence of chromaticity effects [ 37 ] while measuring sizes.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of electron beam transverse slice emittance using a focused beamline

Jiang

Feng

Wang

et al. 2023

High Pow Laser Sci Eng

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A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole. The betatron phase of electrons based on laser wakefield acceleration (LWFA) is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing (defocusing) field in the bubble. Phase space presents slice information after phase compensation relative to the center energy. Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment. Diagnosis of slice emittance facilitates local electron quality manipulation, which is important for the development of LWFA-based free electron lasers. The quasi-3D PIC simulations matched the experimental results and analysis well.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of electron beam transverse slice emittance using a focused beamline

Jiang

Feng

Wang

et al. 2023

High Pow Laser Sci Eng

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“…Furthermore, advanced concepts with capillary discharges have demonstrated novel injection techniques [27][28][29][30][31] , the generation of plasma-driven X-ray pulses [32,33] , synchrotron radiations [34] and high harmonics [35] , cascade acceleration schemes [36][37][38] , energy dechirpers [39][40][41] and the transport of LPA electron [35,[42][43][44][45][46][47][48][49][50] and proton beams [51,52] as novel active plasma lenses (APLs). In particular, APLs have a focus gradient of up to several kT/m.…”

Section: Introductionmentioning

confidence: 99%

Measurements of plasma density profile evolutions with a channel-guided laser

Yang¹,

Guo²,

Yan³

et al. 2023

High Pow Laser Sci Eng

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The discharged capillary plasma channel has been extensively studied as a high-gradient particle acceleration and transmission medium. A novel measurement method of plasma channel density profiles has been employed, where the role of plasma channels guiding the advantages of lasers has shown strong appeal. Here, we have studied the highorder transverse plasma density profile distribution using a channel-guided laser, and made detailed measurements of its evolution under various parameters. The paraxial wave equation in a plasma channel with high-order density profile components is analyzed, and the approximate propagation process based on the Gaussian profile laser is obtained on this basis, which agrees well with the simulation under phase conditions. In the experiments, by measuring the integrated transverse laser intensities at the outlet of the channels, the radial quartic density profiles of the plasma channels have been obtained. By precisely synchronizing the detection laser pulses and the plasma channels at various moments, the reconstructed density profile shows an evolution from the radial quartic profile to the quasi-parabolic profile, and the high-order component is indicated as an exponential decline tendency over time. Factors affecting the evolution rate were investigated by varying the incentive source and capillary parameters. It can be found that the discharge voltages and currents are positive factors quickening the evolution, while the electron-ion heating, capillary radii and pressures are negative ones. One plausible explanation is that quartic profile contributions may be linked to plasma heating. This work helps one to understand the mechanisms of the formation, the evolutions of the guiding channel electron-density profiles and their dependences on the external controllable parameters. It provides support and reflection for physical research on discharged capillary plasma and optimizing plasma channels in various applications.

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“…In recent years, plasma optics has been proposed to manipulate spatiotemporally ultrashort high-power lasers without considering the laser-damage issues for various applications, such as plasma mirror (PM) and spatiotemporal plasma-lens filter used for improving the temporal contrast of lasers, [11][12][13][14][15] active plasma lenses for relativistic laser-plasmaaccelerated electron beams, 16,17) plasma gratings for implosion symmetry tuning of the ignition of the laser confinement fusion (ICF) targets by facilitating the power transfer between intense lasers, plasma laser amplifiers and plasma laser compressors for the ultrashort laser pulse amplification. [18][19][20] Pulse chirp is widely applied to the area of ultrashort laser detections.…”

mentioning

confidence: 99%

Tunable plasma narrow-band filter for ultrafast high-power lasers

Zhang

Zhu

Xie

et al. 2021

Appl. Phys. Express

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We proposed a technique of tunable plasma narrow-band filter (PNBF) to generate high-power narrow-band pulses based on a plasma mirror and pulse chirp. PNBFs have an ultra-wide free spectral range, high damage threshold, and accurate wavelength-tunable function, and tunable sub-nanometer pulses could be achieved by controlling the pulse chirp. The feasibility of the proposed technique was verified by both simulation and experiment. Three ∼0.6 nm bandwidth pulses centered at different wavelengths were obtained respectively, maintaining good near and far-field beam quality. PNBF is expected to be an effective technique for high-power tunable narrow-band pulse generation with high-power ultrafast lasers.

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A compact, high resolution energy, and emittance diagnostic for electron beams using active plasma lenses

Cited by 9 publications

References 31 publications

Measurement of electron beam transverse slice emittance using a focused beamline

Measurement of electron beam transverse slice emittance using a focused beamline

Measurements of plasma density profile evolutions with a channel-guided laser

Tunable plasma narrow-band filter for ultrafast high-power lasers

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