Original title:
Design and Testing of Low Temperature Part of an UHV – SPM Microscope
Authors:
Frolec, Jiří ; Vonka, J. ; Hanzelka, Pavel ; Králík, Tomáš ; Musilová, Věra ; Urban, Pavel Document type: Papers Conference/Event: Cryogenics 2014. The IIR International Conference /13./, Praha (CZ), 2014-04-07 / 2014-04-11
Year:
2014
Language:
eng Abstract:
We have developed low temperature part of an ultra high vacuum scanning probe microscope (UHV-SPM) working at variable temperature within the range from 20 K to 700 K. To achieve the required temperature range, a flow cooling system using cryogenic helium (approximately 5 K) as a coolant was designed. The system consists of a flow cryostat and a flexible low-loss transfer line connecting a Dewar vessel with the flow cryostat. We have also tested liquid nitrogen (approximately 77 K) as an alternative low-cost coolant. Using nitrogen, the microscope can operate at temperatures of about 100 K and higher. As the flow of the coolant through the cryostat can cause thermally induced two-phase flow fluctuations resulting in instability in temperatures, preliminary tests were done in order to find ways of avoiding the temperature oscillations and optimising the cooling process.
Keywords:
cryogenics; flow cryostat; low conductive support; LT-SPM; VT-SPM Project no.: LO1212 (CEP), ED0017/01/01, TE01020233 (CEP) Funding provider: GA MŠk, GA MŠk, GA TA ČR Host item entry: Cryogenics 2014. The 13th IIR International Conference Proceedings, ISBN 978-2-36215-002-9, ISSN 0151-1637
Institution: Institute of Scientific Instruments AS ČR
(web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0245536