Fermi chopper developed at KEK
Fermi chopper developed at KEK
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KEK 开发的费米斩波器
DOI：
10.1016/j.nima.2011.09.048
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T.Yokoo
中科院分区：
文献类型：
--
作者：
S.Itoh;K.Ueno;T.Yokoo
本文通过对涡轮分子泵的磁力轴承系统进行改造，研制出了费米斩波器，并在日本质子加速器研究中心（J-PARC）成功制作出了实际装置，该装置采用与涡轮分子泵相似的旋转系统，以f= 100-600Hz的频率旋转。我们假设相位控制精度为Δτ≤0.3μs，即在旋转频率f=600Hz时频率分辨率为Δf≤0.01Hz，作为开发的规范。相位控制系统采用直接数字合成器（DDS）系统，在f=600Hz时频率控制单元为0.00058Hz。在f=600Hz时，所制备的费米斩波器的相位控制精度为Δτ=0.08μs，完全符合规范参数。将自制的费米斩波器安装在J-PARC的高分辨率斩波光谱仪（HRC）上，观察到入射中子能量Ei=206meV的能量分辨率与设计的标准分辨率ΔE/Ei=2.5%相同。我们制造出了最先进的费米直升机。
We developed a Fermi chopper by modification of a turbo molecular pump with a magnetic bearing system, and the actual device, rotating at f=100–600Hz using a rotation system similar to the turbo molecular pump, was successfully produced for inelastic neutron scattering experiments at the Japan Proton Accelerator Research Complex (J-PARC). We assumed a phase control accuracy of Δτ≤0.3μs, i.e., a frequency resolution of Δf≤0.01Hz at a rotational frequency of f=600Hz, as the specification for the development. The phase control system was developed using a direct digital synthesizer (DDS) system with a frequency control unit of 0.00058Hz at f=600Hz. The phase control accuracy in the produced Fermi chopper was observed to be Δτ=0.08μs at f=600Hz, well within the specification parameters. After mounting the produced Fermi chopper on the High Resolution Chopper Spectrometer (HRC) at J-PARC, the energy resolution for an incident neutron energy Ei=206meV was observed to be identical to the designed standard resolution of ΔE/Ei=2.5%. We were able to produce a state-of-the-art Fermi chopper.
在 J-PARC RCS 中实现高功率质子束的极低抖动提取
DOI：
10.1016/j.nima.2011.05.040
发表时间：
2011
影响因子：
1.4
作者：
F. Tamura;M. Yoshii;A. Schnase;C. Ohmori;M. Yamamoto;M. Nomura;M. Toda;T. Shimada;K. Hara;K. Hasegawa
通讯作者：
K. Hasegawa
热中子速度选择器及其在硼截面测量中的应用
影响因子：
--
作者：
E. Fermi;J. Marshall;L. Marshall
通讯作者：
L. Marshall