語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
An atom trap trace analysis (ATTA) s...
~
Yoon, Tae Hyun.
FindBook
Google Book
Amazon
博客來
An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon dark matter detectors.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon dark matter detectors./
作者:
Yoon, Tae Hyun.
面頁冊數:
142 p.
附註:
Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
Contained By:
Dissertation Abstracts International75-02B(E).
標題:
Physics, Atomic. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600541
ISBN:
9781303506680
An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon dark matter detectors.
Yoon, Tae Hyun.
An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon dark matter detectors.
- 142 p.
Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
Thesis (Ph.D.)--Columbia University, 2013.
The XENON dark matter experiment aims to detect hypothetical weakly interacting massive particles (WIMPs) scattering off nuclei within its liquid xenon (LXe) target. The trace 85Kr in the xenon target undergoes beta-decay with a 687 keV end point and 10.8 year halflife, which contributes background events and limits the sensitivity of the experiment. In order to achieve the desired sensitivity, the contamination by krypton is reduced to the part per trillion (ppt) level by cryogenic distillation. The conventional methods are not well suited for measuring the krypton contamination at such a low level. In this work, we have developed an atom trap trace analysis (ATTA) device to detect the ultra-low krypton concentration in the xenon target. This project was proposed to the National Science Foundation (NSF) as a Major Research Instrumentation (MRI) development [Aprile and Zelevinsky, 2009] and is funded by NSF and Columbia University.
ISBN: 9781303506680Subjects--Topical Terms:
1029235
Physics, Atomic.
An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon dark matter detectors.
LDR
:03089nam a2200313 4500
001
1965122
005
20141010093004.5
008
150210s2013 ||||||||||||||||| ||eng d
020
$a
9781303506680
035
$a
(MiAaPQ)AAI3600541
035
$a
AAI3600541
040
$a
MiAaPQ
$c
MiAaPQ
100
1
$a
Yoon, Tae Hyun.
$3
1932864
245
1 3
$a
An atom trap trace analysis (ATTA) system for measuring ultra-low contamination by krypton in xenon dark matter detectors.
300
$a
142 p.
500
$a
Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
500
$a
Adviser: Tanya Zelevinsky.
502
$a
Thesis (Ph.D.)--Columbia University, 2013.
520
$a
The XENON dark matter experiment aims to detect hypothetical weakly interacting massive particles (WIMPs) scattering off nuclei within its liquid xenon (LXe) target. The trace 85Kr in the xenon target undergoes beta-decay with a 687 keV end point and 10.8 year halflife, which contributes background events and limits the sensitivity of the experiment. In order to achieve the desired sensitivity, the contamination by krypton is reduced to the part per trillion (ppt) level by cryogenic distillation. The conventional methods are not well suited for measuring the krypton contamination at such a low level. In this work, we have developed an atom trap trace analysis (ATTA) device to detect the ultra-low krypton concentration in the xenon target. This project was proposed to the National Science Foundation (NSF) as a Major Research Instrumentation (MRI) development [Aprile and Zelevinsky, 2009] and is funded by NSF and Columbia University.
520
$a
The ATTA method, originally developed at Argonne National Laboratory, uses standard laser cooling and trapping techniques, and counts single trapped atoms. Since the isotopic abundance of 85Kr in nature is 1.5 x 10-11, the 85Kr/Xe level is expected to be ∼10-23, which is beyond the capability of our method. Thus we detect the most abundant (57%) isotope 84Kr, and infer the 85Kr contamination from their known abundances. To avoid contamination by krypton, the setup is tested and optimized with 40 Ar which has a similar cooling wavelength to 84Kr.
520
$a
Two main challenges in this experiment are to obtain a trapping efficiency high enough to detect krypton impurities at the ppt level, and to achieve the resolution to discriminate single atoms. The device is specially designed and adjusted to meet these challenges. After achieving these criteria with argon gas, we precisely characterize the efficiency of the system using Kr-Xe mixtures with known ratios, and find that ∼90 minutes are required to trap one 84Kr atom at the 1-ppt Kr/Xe contamination.
520
$a
This thesis describes the design, construction, and experimental results of the ATTA project at Columbia University.
590
$a
School code: 0054.
650
4
$a
Physics, Atomic.
$3
1029235
650
4
$a
Physics, Astrophysics.
$3
1671120
690
$a
0748
690
$a
0596
710
2
$a
Columbia University.
$b
Physics.
$3
2101563
773
0
$t
Dissertation Abstracts International
$g
75-02B(E).
790
$a
0054
791
$a
Ph.D.
792
$a
2013
793
$a
English
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600541
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9260121
電子資源
11.線上閱覽_V
電子書
EB
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入