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Bachelor's Thesis
Author of thesis: Ing. Tomáš Pola
Acad. year: 2015/2016
Supervisor: Ing. Pavel Urban, Ph.D.
Reviewer: Ing. Ivan Vlček, Ph.D.
This thesis focuses on experimental verification and experimental-based improvements of designed low temperature parts of stage of the UHV SEM/SPM microscope, which operates in temperature range from 20 K to 700 K. The main focus is on the functionality verification of thermal insulation pad (InBallPad) as well as on the effect of length and contact quality of braid on minimal achievable temperature. The contact quality of sample holder with sample carrier realized with two springs is investigated together with influence of thermal contact resistances on achievable temperature. The thesis also contains a calculation model used for cooldown times and minimal temperature estimation. In the conclusion of this work several future experiments are suggested which could explain some of the observed, yet unexpected, phenomena.
Helium flow cryostat, UHV SEM/SPM stage, thermal insulation pad, braid, cooled sample holder, thermal contact resistance
Date of defence
23.06.2016
Result of the defence
Defended (thesis was successfully defended)
Grading
B
Language of thesis
Czech
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) prof. RNDr. Petr Dub, CSc. (člen) prof. RNDr. Radim Chmelík, Ph.D. (člen) prof. RNDr. Jiří Spousta, Ph.D. (člen) prof. Ing. Ivan Křupka, Ph.D. (člen) prof. RNDr. Pavel Zemánek, Ph.D. (člen) RNDr. Antonín Fejfar, CSc. (člen) doc. Ing. Radek Kalousek, Ph.D. (člen)
Supervisor’s reportIng. Pavel Urban, Ph.D.
Grade proposed by supervisor: B
Reviewer’s reportIng. Ivan Vlček, Ph.D.
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová