X光自由電子雷射擁有同調、高時序解析、可調頻、極高亮度等優良特性，為最重要的加速器光源之一。
X光自由電子雷射系統中最主要的關鍵技術之一是光注射器的設計。唯有注射高品質的電子束，才能使自由電子雷射成功運作。本研究從理論出發，以電腦模擬驗證，以國家同步輻射中心之光陰極注射器為主要研究對象來探討影響發射度的各種參數。並依我們現有的儀器能力找尋最佳化的操作點，產生規一化亮度在10^14 A/m^2以上之電子束，做X光自由電子雷射及其他新型光源研究之用。
除了發射度控制之外，在本文中亦討論電子束的壓縮技術，模擬電子束經兩種常見的方法壓縮之後特性的變化，除了能大幅提高電子束峰電流，也追求短脈衝電子束的其他應用。

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