Lattice Modification of a 1.2 GeV STB Ring for Generation of High Energy Gamma-Rays Using Internal Target Wire
Lattice Modification of a 1.2 GeV STB Ring for Generation of High Energy Gamma-Rays Using Internal Target Wire
复制标题
1.2 GeV STB 环的晶格修改，用于使用内部目标线生成高能伽马射线
DOI：
10.1109/pac.2005.1591144
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
K. Shinto
中科院分区：
文献类型：
--
作者：
F. Hinode;H. Hama;M. Kawai;A. Kurihara;M. Mutoh;M. Nanao;Y. Shibasaki;S. Takahashi;T. Tanaka;A. Miyamoto;K. Shinto
东北大学核科学研究室（LNS）已在常规运行一个1.2GeV的拉伸-助推环（STB环）。STB环具有脉冲束展宽器和助推器存储环的功能[1，2]。在助推器贮存操作中，利用内靶丝通过韧致辐射产生的高能γ射线束进行核物理实验。由于库仑散射，循环电子的一些部分也在靶线中偏转，而没有显著的能量损失。没有离开动态孔径一次的散射电子可以在环中循环。然而，这样的电子在进一步的转动期间将撞击室壁和靶线的支撑件，因为它们具有非常大的电子感应加速器振幅。因此，库仑散射电子必须是一个显着的背景源，并可能导致γ射线束质量的退化。通过改变环的晶格函数，γ射线束的质量得到了改善。文中给出了改进的细节和改进的结果。
A 1.2 GeV Stretcher-Booster Ring (STB ring) has been routinely operated at Laboratory of Nuclear Science (LNS), Tohoku University. The STB ring has functions of a pulse-beam stretcher and a booster-storage ring [1, 2]. In the booster-storage operation, high energy gamma-ray beam generated via bremsstrahlung from internal target wire is utilized for experiments of nuclear physics. Some fractions of circulating electrons are also deflected in the target wire due to Coulomb scattering without significant loss of the energy. The scattered electrons that are not getting out of the dynamic aperture once can circulate in the ring. Such electrons, however, would hit the chamber walls and supports of the target wire during further turns, because they have very large betatron amplitude. Consequently the Coulomb scattered electrons must be a source of significant background and may cause a degradation of gamma-ray beam quality. The quality of the gamma-ray beam has been improved by modifying the lattice functions of the ring. We present the details of the modification and the result of the improvement.