posted on 2019-07-09, 10:23authored byR. Sirvinskaite, O.B. Malyshev, Reza Valizadeh, A. Hannah, Michael Cropper, Sihui Wang
Non-Evaporable Getter (NEG) coating has been used for
years in many particle accelerators due to its advantages
like evenly distributed pumping speed, low thermal
outgassing, and low photon, electron and ion stimulated
desorption yields. Although NEG coating has been tested
at room temperatures intensively, there is little data on its
behaviour at cryogenic temperatures. Tests in this
environment are important for the Future Circular Collider
(FCC) study and other accelerator facilities where the
operational conditions of the beam screen are restricted to
cryogenic temperatures. This work will provide some
preliminary results on NEG properties at low temperatures,
e.g. pumping speed and capacity, as well as its behaviour
under electron bombardment, where electron stimulated
desorption (ESD) yields will be calculated. The ternary TiZr-V coating, deposited with dense and columnar structure,
will be the first material to be tested at cryogenic
temperatures in ASTeC Daresbury laboratory. The results
were compared with the ones obtained at room
temperature, offering an insight into the behaviour of
NEG-coated cryogenic chambers when beam-induced
effects are present.
Funding
The European Circular Energy-Frontier Collider Study
(EuroCirCol) project has received funding from the
European Union’s Horizon 2020 research and innovation
programme under grant No 654305. The target was funded by
the National Key Research and Development Program of
China under grant No 2016YFA0402004.
History
School
Science
Department
Physics
Published in
10th International Particle Accelerator Conference
Pages
? - ? (4)
Citation
SIRVINSKAITE, R. ... et al.,2019. Electron stimulated desorption from cryogenic NEG-coated surfaces. Presented at the 10th International Particle Accelerator Conference (IPAC2019,), Melbourne, 19-24th May. Geneva: JACoW.
Publisher
Joint Accelerator Conferences Website (JACoW)
Version
VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
Acceptance date
2019-06-21
Publication date
2019
Notes
This is an Open Access Paper. It is published by JACoW under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/