Characterization of plasma sources for plasma-based accelerators

Arjmand, S.; Alesini, D.; Anania, M. P.; Biagioni, A.; Chiadroni, E.; Cianchi, A.; Giovenale, D. Di; Pirro, G. Di; Ferrario, M.; Lollo, V.; Mostacci, A.; Pellegrini, Donato; Pompili, R.; Stella, A.; Vaccarezza, C.; Zigler, A.

doi:10.1088/1748-0221/15/09/c09055

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…The spectral line broadening is induced by the electric fields generated by the charged particles in the plasma, in accordance with this effect. By measuring the full width at half maximum (FWHM) of the spectral line (using Balmer Series), the plasma electron density can be determined [13,15,16]. In our experiments, the measured plasma density of 10 17 cm −3 corresponds to a plasma wavelength, 𝜆 𝑝 , of 300-100 μm [16].…”

Section: Experimental Apparatusmentioning

confidence: 95%

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Shot-by-shot stability of the discharge produced plasmas in suitably shaped capillaries

et al. 2023

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Compact accelerator machines are capable of producing accelerating gradients in the GV/m scale, which is significantly higher than the MV/m scale of conventional machines. As accelerators are widely used in many fields, such as industrial, research institutes, and medical applications, the development of these machines will undoubtedly have a profound impact on people's daily lives. SPARC_LAB, a test facility at INFN-LNF (Laboratori Nazionali di Frascati), is focused on enhancing particle accelerator research infrastructure using innovative plasma acceleration concepts. Within SPARC_LAB, we utilize plasma-filled capillaries with lengths of up to tens of centimeters. However, the plasma formation process is critical to ensure proper oversight of the plasma properties, which subsequently affects the dynamics of the electron bunch to be accelerated. One of the most critical points that significantly affects the properties of the electron beam passing through the plasma source is the shot-by-shot stability of the plasma density along the longitudinal dimension of the plasma-discharge capillary. Therefore, this paper aims to investigate the shot-by-shot stability of the plasma density during discharge, contributing to further advancements in the field of plasma acceleration.

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Section: Experimental Apparatusmentioning

confidence: 95%

“…By measuring the full width at half maximum (FWHM) of the spectral line (using Balmer Series), the plasma electron density can be determined [13,15,16]. In our experiments, the measured plasma density of 10 17 cm −3 corresponds to a plasma wavelength, 𝜆 𝑝 , of 300-100 μm [16].…”

Section: Experimental Apparatusmentioning

confidence: 95%

Shot-by-shot stability of the discharge produced plasmas in suitably shaped capillaries

et al. 2023

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“…The SPARC_LAB at INFN-LNF has recently conducted several fruitful experiments on various capillary tubes, investigating the methods of plasma generation and characterization [15][16][17]. The plasma electron density along the longitudinal coordinate of the capillary tube has been diagnosed to characterize the tube.…”

Section: Plasma Diagnostic By Balmer Emissionmentioning

confidence: 99%

Investigating of plasma diagnostics by utilizing spectroscopic measurements of Balmer emission

et al. 2023

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Plasma technology offers revolutionary potential for particle accelerators by enabling the acceleration of electron beams to ultra-relativistic velocities in a small-scale dimension. The compact nature of plasma-based accelerators permits the creation of accelerating gradients on the GV scale. Plasma acceleration structures are created by utilizing either ultra-short laser pulses (Laser Wakefield Acceleration, LWFA) or energetic particle beams (Particle Wakefield Acceleration, PWFA), which need to be tailored to the plasma parameters. However, both methods face the challenge of limited acceleration length, which is currently only a few centimeters. To overcome this challenge, one approach is to generate plasma within a capillary tube, which can extend the acceleration length up to approximately forty centimeters or more. Consequently, it is crucial to characterize the produced plasma in terms of density and geometric structure. Optical emission spectroscopy (EOS) methods can be employed to measure and characterize the plasma electron density by analyzing the emitted plasma light. This paper presents measurements of the plasma electron density distribution for a hydrogen-filled capillary tube using both Balmer alpha (Hα) and Balmer beta (Hβ) lines. Comparing the intensities of Hα and Hβ emissions enables more precise measurements of the plasma electron density and provides additional information about other plasma properties.

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“…the following formula, which relates the full width at half maximum (FWHM) of Balmer beta (H β ) to the electronic plasma density based on a SLB diagnostic [9][10][11][12][13]:…”

Section: Jinst 18 P08003mentioning

confidence: 99%

Different elements, same results: time-resolved temperature determination by oxygen and nitrogen elements

et al. 2023

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The core purpose of this research is to use optical emission spectroscopy to determine the electron temperature (Te ) of a hydrogen plasma generated in a capillary discharge plasma, with a focus on its temporal variation. The plasma density (ne ) is first determined using the Stark broadening technique, which measures the broadening of spectral lines as a result of the electric field in the plasma. Subsequently, a passive spectroscopic technique is employed to estimate the electron plasma temperature by detecting the emitted light from the plasma. This spectral detection is performed using a visible range spectrometer. In this study, two elements, oxygen and nitrogen, are specifically selected based on the chemical composition of the capillary. The electron plasma temperature is estimated using the line ratio method, which involves comparing the intensities of two specific spectral lines emitted by the selected elements. By analyzing these line ratios, the electron plasma temperature can be inferred. The combination of the Stark broadening technique and line ratio method provides valuable insights into the plasma's physical characteristics, specifically its density and temperature.

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Characterization of plasma sources for plasma-based accelerators

Cited by 7 publications

References 10 publications

Shot-by-shot stability of the discharge produced plasmas in suitably shaped capillaries

Shot-by-shot stability of the discharge produced plasmas in suitably shaped capillaries

Investigating of plasma diagnostics by utilizing spectroscopic measurements of Balmer emission

Different elements, same results: time-resolved temperature determination by oxygen and nitrogen elements

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