منابع مشابه
Scaling function and universal amplitude combinations for self-avoiding polygons
We analyse new data for self-avoiding polygons (SAPs), on the square and triangular lattices, enumerated by both perimeter and area, providing evidence that the scaling function is the logarithm of an Airy function. The results imply universal amplitude combinations for all area moments and suggest that rooted SAPs may satisfy a q-algebraic functional equation. PACS numbers: 05.50+q, 02.10.AB, ...
متن کاملDerivation of FEL gain using wakefield approach
We describe the one-dimensional SASE FEL instability using the wake approach. First, we obtain an expression for the longitudinal 1-D wake in a helical undulator. We then show that taking into account the retardation effect in the Vlasov equation with the proper wake leads to the correct result for the FEL instability, in agreement with the traditional theory. Presented at the 2003 Particle Acc...
متن کاملRecent Progress in High-gain Fel Theory
High-gain free electron lasers (FEL) are being developed as extremely bright x-ray sources of a next-generation radiation facility. In this paper, we review the basic theory and the recent progress in understanding the startup, the exponential growth and the saturation of the high-gain process, emphasizing the self-amplified spontaneous emission (SASE). We will also discuss how the FEL performa...
متن کاملThe Integral Equation for a High Gain Fel
The theory of a high gain free electron laser (FEL) is now well developed (e.g., see [1]). In this paper I derive the equation for the electron distribution function, which is valid for FELs with a longitudinally inhomogeneous magnetic system (which may include, in particular, dispersive sections, quadrupole lenses, and simply empty spaces between the undulator sections), magnetic field errors ...
متن کاملUniversal Scaling, Beta Function, and Metal-Insulator Transitions
We demonstrate a universal scaling form of longitudinal resistance in the quantum critical region of metal-insulator transitions. This is based on numerical results of three-dimensional Anderson transitions (with and without magnetic field), two-dimensional quantum Hall plateau to insulator transition, as well as experimental data of the recently discovered two-dimensional metal-insulator trans...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
سال: 1991
ISSN: 0168-9002
DOI: 10.1016/0168-9002(91)90920-l