Pharos–a chopper spectrometer for inelastic-neutron-scattering studies of excitations in materials
Pharos–a chopper spectrometer for inelastic-neutron-scattering studies of excitations in materials
复制标题
Pharos——用于材料激发非弹性中子散射研究的斩波光谱仪
DOI：
10.1080/10448630308218513
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
R. Robinson
中科院分区：
文献类型：
--
作者：
R. McQueeney;R. Robinson
摘要近十年来，灯塔光谱仪一直是LANSCE用户计划的一部分。最初，该仪器仅具有主要用于中子布里渊散射研究的低散射角飞行路径[11]。然而，在过去的一年里，灯塔完成了重大升级，增加了317个新的位置敏感探测器在大散射角（共392），新的数据采集系统硬件和软件，更可靠的费米斩波器系统，一个新的斩波器控制系统，和一个新的真空系统。这些升级扩大了灯塔可以解决的科学问题的范围，并提高了仪器的可靠性和效率。此外，Pharos样品环境套件目前正在扩展，包括高温（高达1.500°C），大磁场（高达11 T）和高压（高达10 kbar）。Pharos现在可以进行全方位的非弹性中子散射测量，包括单晶中的声子和自旋波色散，声子和自旋波态密度，晶体场，自旋轨道和其他电子激发，以及中子布里渊散射。
Abstract The Pharos spectrometer has been a part of the LANSCE user program for nearly a decade. Originally, the instrument possessed only a low-scattering-angle flight path used primarily for neutron Brillouin scattering studies [11. However, in the last year, a major upgrade of Pharos was completed, adding 3 17 new position-sensitive detectors at large scattering angles (for a total of 392), new data-acquisition system hardware and software, a more reliable Fermi chopper system, a new To chopper control system, and a new vacuum system. These upgrades have expanded the scope of scientific problems that Pharos can address and have improved the reliability and efficiency of the instrument. In addition, the suite of Pharos sample environments are presently being expanded to include high temperatures (up to 1.500°C), large magnetic fields (up to 11 T), and high pressures (up to 10 kbar). Pharos can now perfoFm a full range of inelastic-neutron-scattering measurements, including phonon and spinwave dispersions in single crystals, phonon and spin-wave densities of states, crystal-field, spin-orbit, and other electronic excitations, and neutron Brillouin scattering.