排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
2.
徐成海 Robert Chehab Peter Sievers Xavier Artru Michel Chevallier Olivier Dadoun 裴国玺 Vladimir M. Strakhovenko Alessandro Variola 《中国物理 C》2012,36(9):871-878
A non-conventional positron source using the intense γ radiation from an axially oriented monocrystal which materializes into e+e- pairs in a granular amorphous converter is described. The enhancement of photon radiation by multi-GeV electrons crossing a tungsten crystal along its <111> axis is reported. The resulting enhancement of pair production in an amorphous converter placed 2 meters downstream, is also reported. Sweeping off the charged particles from the crystal by a bending magnet upstream of the converter allows a significant reduction of the deposited energy density. Substituting a granular target made of small spheres for the usual compact one, makes the energy dissipation easier. The deposited energy and corresponding heating are analyzed and solutions for cooling are proposed. The configurations studied here for this kind of positron source allow its consideration for unpolarized positrons for the ILC. 相似文献
3.
Precise and fast 3D space-charge calculations have become important for high intensity hadron accelerator design. The PIC method is most frequently used due to its efficiency. This paper introduces a 3D-PIC code that computes the potential of the bunch in the rest frame by means of Poisson’s equation. FFT is applied as Poisson solvers. The details and the results are presented as well as error analysis. 相似文献
4.
1