原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2015年
8期
1483-1487
,共5页
程鹏%张红霞%鲍威%郝丽杰%魏国海%刘蕴韬%陈东风
程鵬%張紅霞%鮑威%郝麗傑%魏國海%劉蘊韜%陳東風
정붕%장홍하%포위%학려걸%위국해%류온도%진동풍
中子散射%能量分辨率%MCSTAS模拟%中子广谱谱仪
中子散射%能量分辨率%MCSTAS模擬%中子廣譜譜儀
중자산사%능량분변솔%MCSTAS모의%중자엄보보의
neutron scattering%energy resolution%MCSTAS simulation%neutron multi-channel spectrometer
能量分辨率是中子散射谱仪设计中需重点模拟计算的一项指标。本文阐述了基于反应堆中子源的两种冷中子非弹性散射谱仪———三轴谱仪和广谱谱仪的基本测量原理,利用MCSTAS软件分别建立两种谱仪的中子束追踪模型,完成了不同中子入射能量和出射能量下的谱仪整体能量分辨率的定量模拟计算。通过对比发现,广谱谱仪由于其测量原理即特殊的变异散射平面的限制,较三轴谱仪具有低的能量分辨率,但这种特殊的变异散射平面的中子散射轨迹却可优化广谱谱仪的分析器和探测器空间布局。通过分析模拟计算结果给出了适用于提高广谱谱仪能量分辨率的中子准直器类型。
能量分辨率是中子散射譜儀設計中需重點模擬計算的一項指標。本文闡述瞭基于反應堆中子源的兩種冷中子非彈性散射譜儀———三軸譜儀和廣譜譜儀的基本測量原理,利用MCSTAS軟件分彆建立兩種譜儀的中子束追蹤模型,完成瞭不同中子入射能量和齣射能量下的譜儀整體能量分辨率的定量模擬計算。通過對比髮現,廣譜譜儀由于其測量原理即特殊的變異散射平麵的限製,較三軸譜儀具有低的能量分辨率,但這種特殊的變異散射平麵的中子散射軌跡卻可優化廣譜譜儀的分析器和探測器空間佈跼。通過分析模擬計算結果給齣瞭適用于提高廣譜譜儀能量分辨率的中子準直器類型。
능량분변솔시중자산사보의설계중수중점모의계산적일항지표。본문천술료기우반응퇴중자원적량충랭중자비탄성산사보의———삼축보의화엄보보의적기본측량원리,이용MCSTAS연건분별건립량충보의적중자속추종모형,완성료불동중자입사능량화출사능량하적보의정체능량분변솔적정량모의계산。통과대비발현,엄보보의유우기측량원리즉특수적변이산사평면적한제,교삼축보의구유저적능량분변솔,단저충특수적변이산사평면적중자산사궤적각가우화엄보보의적분석기화탐측기공간포국。통과분석모의계산결과급출료괄용우제고엄보보의능량분변솔적중자준직기류형。
The energy resolution is an important index for simulation and calculation in the design of neutron spectrometers .In this paper ,the working principles of neutron triple‐axis spectrometer and neutron multi‐channel spectrometer were illustrated .With MCSTAS software ,the neutron tracing models of the two spectrometers were built , and the quantitative calculations of the energy resolution in different neutron incident and final energy were completed based on the simulation results . The multi‐channel spectrometer has relatively low energy resolution comparing with triple‐axis spectrome‐ter because of the variation of scattering plane .However ,the variation of scattering plane could optimize the special arrangement of analyzers and detectors in multi‐channel system .Through analyzing the simulation results ,the appropriate collimator types were given in order to improve the energy resolution of multi‐channel spectrometer .