Design and Testing of Low Temperature Part of an UHV – SPM Microscope

0434011 - ÚPT 2015 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Frolec, Jiří - Vonka, J. - Hanzelka, Pavel - Králík, Tomáš - Musilová, Věra - Urban, Pavel
Design and Testing of Low Temperature Part of an UHV – SPM Microscope.
Cryogenics 2014. The 13th IIR International Conference Proceedings. Praha: Icaris, 2014, s. 324-329. ISBN 978-2-36215-002-9. ISSN 0151-1637.
[Cryogenics 2014. The IIR International Conference /13./. Praha (CZ), 07.04.2014-11.04.2014]
Grant CEP: GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01; GA TA ČR TE01020233
Institucionální podpora: RVO:68081731
Klíčová slova: flow cryostat * VT-SPM * LT-SPM * low conductive support * cryogenics
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

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.
Trvalý link: http://hdl.handle.net/11104/0245536