研究目的
Investigating the effectiveness of a LG01 transverse mode laser heater in suppressing microbunching instability (MBI) in free-electron lasers (FELs) compared to traditional Gaussian transverse mode.
研究成果
The experimental demonstration confirms that a LG01 transverse mode laser heater induces a Gaussian energy distribution in the electron beam, leading to improved MBI suppression compared to a Gaussian mode laser heater. This advancement is significant for enhancing the performance of free-electron lasers, especially in applications requiring high spectral brightness and monochromaticity.
研究不足
The effectiveness of the LG01 mode laser heater is compromised by transverse laser jitter, which can lead to a double-horn energy distribution instead of the desired Gaussian-shaped distribution. This jitter is particularly detrimental for the LG01 mode due to its sensitivity to spatial overlap with the electron beam.
1：Experimental Design and Method Selection:
The study employs a LG01 transverse mode laser heater to induce energy spread in an electron beam for MBI suppression. The effectiveness is compared with a traditional Gaussian mode laser heater.
2：Sample Selection and Data Sources:
The experiment is conducted at the Linac Coherent Light Source (LCLS) using its electron beam.
3：List of Experimental Equipment and Materials:
A spiral phase plate (SPP) is used for converting the laser's transverse profile from Gaussian to LG01. The setup includes a laser heater undulator, a spectrometer for energy spread measurement, and a midinfrared (MIR) spectrometer for microbunching characterization.
4：The setup includes a laser heater undulator, a spectrometer for energy spread measurement, and a midinfrared (MIR) spectrometer for microbunching characterization.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The LG01 mode laser heater's performance is evaluated by measuring the induced energy spread and its effect on MBI suppression through downstream diagnostics.
5：Data Analysis Methods:
The data analysis involves comparing the Gaussian fitting coefficients of the energy distributions induced by LG01 and Gaussian mode lasers and analyzing the MIR spectral intensity for MBI suppression evidence.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
