Speaker
Description
A segmented capillary gas cell was developed to enable precise control over electron injection and acceleration in laser wakefield acceleration (LWFA). This system is composed of multiple capillary segments, each with specially designed apertures and independently supplied with gas, allowing the formation of tailored longitudinal density gradients. At the center, a narrower orifice creates a pressure down-gradient, leading to plasma density modulation when ionized. The intended density structure was validated through Stark broadening of hydrogen emission spectra generated by the discharge in the gas cell. In LWFA experiments using a 150 TW laser, this design produced electron beams reaching 300 MeV, showing reduced energy spread and enhanced shot-to-shot stability compared to traditional uniform capillaries. This segmented configuration offers a promising method for improving plasma-based acceleration by enabling fine control of plasma density profiles.
| Working group | WG1 |
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