TiZrV nonevaporable getter (NEG) coated vacuum chambers is a new vacuum technology which is already used in many particle accelerators worldwide. This coating is also interesting for heavy-ion accelerator chambers, however desoprtion yields have been so far mostly unknown. The value of the total desorption yield from the activated NEG coated tube is 2600 molec./ion, while for CO saturated NEG it was found to be 7000 molec./ion. The partial pressures inside the saturated NEG coated tube were up to 20x larger than those inside the activated one. CO partial pressure showed major increase.

COBISS.SI-ID: 22442535

The aim of this experiment is to measure desorption yieldsfrom materials commonly used in accelerators: 316LN stainless steel, Cu, etched Cu, gold coated Cu and Ta. The measured initial desorption yields vary for the same material from sample to sample: up to 4.5 times for stainless steel and up to 3 times for etched Cu. There is a significant difference of up to a few times in desorption yield between flat and tubular samples. The desorption yield from a Cu sample at grazing incident angle of 125 mrad was an order of magnitude larger than at normal incident angle.

COBISS.SI-ID: 22442279

The basic ideas of the finite-element method (FEM) for solving the problem of piezoelectric media are presented. Starting with the tri-dimensional finite-element method, we have developed a numerical computational method for a determination of the direct piezoelectric effect and the eigenmodes of vibration (the inverse piezoelectric effect). FEM is normally used for solving problems related to macrostructures. The aim of this work is to show that FEM is also a useful and convenient method for solving problems in relation to microstructures.

COBISS.SI-ID: 777898

Stark shifts of 29 doubly ionized argon (Ar III) spectral lines (28 experimental values reported for the first time) belonging to 16 multiplets (13 reported for the first time) in 10 transition arrays (seven reported for the first time) have been measured in a mixture of Ar (72%) and He (28%) plasma created in the linear, low-pressure, pulsed arc discharge in the electron temperature interval (26 000–30 000 K) and electron density interval (0.16-1.68) 1023 m-3.This research is the first to present, measured (347.1295, 347.2567, 335.2118 and 302.7086 nm) Ar III spectral lines Stark widths.

COBISS.SI-ID: 932347

We model processes with H2 molecules in both ground and vibrationally excited state and with H atoms, including excitation, relaxation, dissociation and recombination in particle-surface interactions. It is a building block of a physics-based model endorsed by the experiment on vibrational spectroscopy of H2 molecules performed at JSI. We join experimental and theoretical methods to obtain and validate data on processes with vibrationally excited hydrogen molecules significant for understanding and controlling edge plasma characteristics in tokamaks.

COBISS.SI-ID: 1322235