研究生: |
蘇暉家 Hui-Chia Su |
---|---|
論文名稱: |
清華大學水池式反應器 W-3 中子反射儀之建立 Construction of Neutron Reflecometer at Tsing-Hua Open Pool Reactor W3 Beam Port |
指導教授: |
李志浩
Chih-Hao Lee |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2002 |
畢業學年度: | 90 |
語文別: | 中文 |
論文頁數: | 75 |
中文關鍵詞: | 中子 、中子反射儀 、中子反射率 、反射率 |
外文關鍵詞: | neutron, neutron reflectometer, neutron reflectivity, reflectivity |
相關次數: | 點閱:2 下載:0 |
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在清大的研究用反應器,選定 W3 中子束進行中子反射儀的建立,利用透過分光器分光之後所得的單一波長來做實驗。此一中子束線為清大反應器運轉四十年來第一條散射中子束。中子反射儀可以被利用在高分子及磁性薄膜的原子縱深分布以及磁縱深分布的研究工作上。中子主要跟原子核與磁矩產生作用,而X光主要是與電子雲發生作用,在凝態物理研究上,為兩大重要且互補的研究工具。非極化中子反射儀已架設完成,而極化中子反射儀之架設正在規劃架設中。在極化中子反射儀架設方面,將採用Heusler晶體進行分光並極化中子束或者使用石墨晶體分光後,再經由Fe/Si超級鏡片 (supermirror) 對中子進行極化。初步結果證實,中子反射儀在樣品旋轉台的最大計數率為每秒 10^5 個中子,背景值為每秒 0.2 個中子,其動態範圍最大可達10^4–10^5。
A neutron reflectometer is installed at Tsing-Hua Open Pool Reactor (THOR) W3 beam port in NTHU (National Tsing Hua University). This is the first neutron scattering beamline at THOR for 40 years operation. The neutron reflectometer can be used to measure the atomic and magnetic depth profiles of the polymer and magnetic thin films. Neutron mainly interacts with the nuclei and magnetic moments; and X-ray interacts with electron clouds, respectively. They are important and complementary tools on the research work of condensed matter physics. The non-polarized neutron reflectometer is finished constructed, and the polarized one is in process currently. For the polarized neutron reflectometer, a Heusler crystal will be used to monochromate and polarize neutron; Or to polarize the neutron by using Fe/Si supermirror after monochromated by the graphite crystal. The preliminary results show that the maximum counting rate is 10^5 cps at the sample stage, the background is 0.2 cps, and the maximum dynamic range can be achieved up to 10^4–10^5.
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