Linear optics control of sideband instability for improved free-electron laser spectral brightness

Pfc/ja-90-9 Influence of Trapped-electron Distribution on the Sideband Instability in a Helical Wiggler Free Electron Laser

Use is made of the Vlasov-Maxwell equations to investigate detailed properties of the sideband instability for a helical wiggler free-electron laser with wiggler wavelength A, = 27r/ko =const and normalized wiggler amplitude a, = eB./mc 2ko =const. The model describes the nonlinear evolution of a right-circularly polarized primary electromagnetic wave with frequency w,, wavenumber k,, and slowl...

Macroclump Model of the Nonlinear Evolution of the Sideband Instability in a Helical Wiggler Free Electron Laser

The nonlinear evolution of a helical wiggler free electron laser is investigated within the framework of a macroclump model for the trapped electrons. The model describes the nonlinear evolution of a right-circularly polarized electromagnetic wave with frequency w, and wavenumber k,, and slowly varying amplitude &,(z, t) and phase 8 ,(z, t) (eikonal approximation). The model further assumes tha...

Pfc/ja-86-54 Influence of Untrapped Electrons on the Sideband Instability in a Helical Wiggler Free Electron Laser

control of the optical properties of nanoparticles by laser fields

در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...

A spectral unaveraged algorithm for free electron laser simulations

We propose and discuss a numerical method to model electromagnetic emission from the oscillating relativistic charged particles and its coherent amplification. The developed technique is well suited for free electron laser simulations, but it may also be useful for a wider range of physical problems involving resonant field-particles interactions. The algorithm integrates the unaveraged coupled...