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Projects / Programmes source: ARIS

Creation and maintenance of ultrahigh to extremely high vacuum

Research activity

Code Science Field Subfield
2.09.00  Engineering sciences and technologies  Electronic components and technologies   

Code Science Field
P180  Natural sciences and mathematics  Metrology, physical instrumentation 
P351  Natural sciences and mathematics  Structure chemistry 
P352  Natural sciences and mathematics  Surface and boundary layery chemistry 
T151  Technological sciences  Optical materials 
T210  Technological sciences  Mechanical engineering, hydraulics, vacuum technology, vibration and acoustic engineering 
Keywords
Hydrogen outgassing, hydrogen recombination, ultra-fine leaks, helium permeation, rate of pressure rise method, spinning rotor gauge, recombination coefficient
Evaluation (rules)
source: COBISS
Researchers (13)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  00741  Bojan Breskvar  Materials science and technology  Researcher  2002 - 2004  160 
2.  08797  MSc Tatjana Drglin  Cardiovascular system  Researcher  2002 - 2004  33 
3.  05673  PhD Bojan Erjavec  Electronic components and technologies  Researcher  2002 - 2004  136 
4.  09846  PhD Lidija Irmančnik-Belič  Chemistry  Researcher  2002 - 2004  99 
5.  05675  PhD Monika Jenko  Neurobiology  Researcher  2002 - 2004  842 
6.  17199  Nataša Lipovšek    Researcher  2002 - 2004  81 
7.  21772  PhD Milorad Milun  Materials science and technology  Head  2002 - 2004  68 
8.  04253  Miroslav Pečar  Electronic components and technologies  Researcher  2002 - 2004  16 
9.  16095  PhD Danijela Anica Skobir Balantič  Materials science and technology  Researcher  2002 - 2004  133 
10.  14647  PhD Darja Steiner Petrovič  Materials science and technology  Researcher  2002 - 2004  237 
11.  04254  PhD Janez Šetina  Electronic components and technologies  Researcher  2002 - 2004  251 
12.  13026  PhD Roman Šturm  Manufacturing technologies and systems  Researcher  2002 - 2004  328 
13.  08195  PhD Borivoj Šuštaršič  Materials science and technology  Researcher  2002 - 2004  412 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0206  Institute of Metals and Technology  Ljubljana  5051622000  5,977 
Abstract
We will study the most critical problems in achieving ultrahigh to extremely high vacuum in large dynamic vacuum systems, such as hydrogen outgassing in austenitic stainless steel vacuum vessels, and in maintaining of ultrahigh to extremely high vacuum in miniature static vacuum systems (special photoelectron tubes), such as ultra-fine leaks through indium soldered seals and helium permeation through quartz input windows. Hydrogen outgassing rate in small-volume test cells with internal surfaces, preconditioned at well-defined conditions, will be measured at room temperature using a very accurate method, based on the rate of pressure rise method, applying the spinning rotor range. The obtained results will be used for modelling the process of hydrogen evolution, considering hydrogen diffusion from bulk to the surface and hydrogen recombination on the surface. The model will be used to determine recombination coefficient, characteristic for a given surface. Varying the surrounding temperature in a narrow range, an activation energy for the process of hydrogen evolution will be determined. Ultra-fine leaks, leading to atmospheric argon accumulation, will be tested at room temperature in test samples using the rate of pressure rise method. The indium solder surfaces will be analysed using a highly sensitive Auger Electron Spectroscopy and X-ray Photoelectron Spectroscopy. Helium permeation flow rate in dependence on time through quartz faceplates, leading to atmospheric helium accumulation, will be measured using a helium leak detector. Accurately determined permeation and diffusion constants at room temperature will be used for modelling a time dependency of helium flow at a sudden change of helium surrounding pressure. We will be able to foreseen the rate of helium pressure rise in photoelectron tubes. The rate of helium pressure rise will be measured additionally in test samples at room temperature using the rate of pressure rise method.
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