Research and development of a large capacity, ultra-high-vacuum-compatible liquid helium cryostat using vapor-cooled shields = 증기 냉각식 실드를 사용하는 초고진공용 대용량 액체 헬륨 크라이오스탯의 연구와 개발

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A novel scheme of a large capacity, Ultra-High-Vacuum (UHV) compatible helium cryostat was designed for a Scanning Probe Microscope (SPM) system, using vapor-cooled shields. Three heat exchangers attached to the shields maximize cooling power by vapor from cryogen without the aid of superinsulation or a nitrogen jacket. To reduce conductive and radiative heat transfer into cryogen, the inner part of the cryostat are only supported by three narrow pipes with multi-functions, and double radiation shields are installed around a dewar. Besides, thermal and mechanical elements, such as thermal contraction, heat capacity, and thermo-acoustic oscillations, are considered for the cryostat design. Temperature of each shield at thermal equilibrium and holding time of cryogen was computed by a C/C++ code. The simulation showed that the cryostat is compatible with both liquid helium and nitrogen, and the holding time for 32 L of liquid helium was expected to be 10 days. However, the actual performance was not as good as the expectation due to poor conductance of heat exchangers. Hence, a revised design of heat exchangers was suggested. The validity of the revised design was demonstrated by calcu-lating its conductance and cooling efficiency, and it will be tested in the future.
Advisors
Lee, Jhin Hwanresearcher이진환researcher
Description
한국과학기술원 :물리학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 물리학과, 2017.8,[iv, 50 p. :]

Keywords

Cryostat▼aLow Temperature▼aUltra-High Vacuum▼aVapor-Cooled Shield▼aScanning Probe Microscope; 크라이오스탯▼a저온▼a초고진공▼a증기 냉각식 실드▼a주사 탐침 현미경

URI
http://hdl.handle.net/10203/242942
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=718577&flag=dissertation
Appears in Collection
PH-Theses_Master(석사논문)
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