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Bachelor's Thesis
Author of thesis: Ing. Jakub Voňka
Acad. year: 2010/2011
Supervisor: Ing. Pavel Urban, Ph.D.
Reviewer: Ing. Ivan Vlček, Ph.D.
Cryogenic flow cryostat with liquid helium (LHe) is being developed by Group of Cryogenics and Superconductivity at Institute of Scientific Instruments for the existing scanning tunneling microscope (STM) working at ambient temperature at Institute of Physical Engineering. This thesis deals with the selection of materials and determination of their material characteristics for potential use in some parts of the low temperature STM (LT-STM), focusing mostly on thermal conductivity in temperature range from 4 K to 300 K. Problematics of copper braids for thermal connection of the sample with cold heat exchanger is discussed. CuCrZr alloy was closely studied as a possible material for sample holder. Heat fluxes through low conductive supports based on thermal resistance of spherical contacts were determined for possible use as an insulation between cold sample holder and STM table.
thermal conductivity, flow LHe cryostat, STM, cryogenics
Date of defence
21.06.2011
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Language of thesis
English
Faculty
Fakulta strojního inženýrství
Department
Institute of Physical Engineering
Study programme
Applied Sciences in Engineering (B3901-3)
Field of study
Physical Engineering and Nanotechnology (B-FIN)
Composition of Committee
prof. RNDr. Tomáš Šikola, CSc. (předseda) prof. RNDr. Miroslav Liška, DrSc. (místopředseda) prof. RNDr. Bohumila Lencová, CSc. (člen) doc. RNDr. Josef Kuběna, CSc. (člen) prof. RNDr. Jiří Komrska, CSc. (člen) prof. RNDr. Pavel Zemánek, Ph.D. (člen) prof. RNDr. Petr Dub, CSc. (člen) prof. RNDr. Radim Chmelík, Ph.D. (člen) prof. Ing. Ivan Křupka, Ph.D. (člen) prof. RNDr. Jiří Spousta, Ph.D. (člen) RNDr. Antonín Fejfar, CSc. (člen)
Supervisor’s reportIng. Pavel Urban, Ph.D.
Grade proposed by supervisor: A
Reviewer’s reportIng. Ivan Vlček, Ph.D.
Grade proposed by reviewer: A
Responsibility: Mgr. et Mgr. Hana Odstrčilová