MEDSI2018 - Classification: Core technology developments / Vacuum

Paper	Title	Page
TUPH15	Friction Stir Welding Attempts for UHV Applications: Stainless Steel/Aluminum	57
	A. Ermakov, C. Martens, U. Naujoks DESY, Hamburg, Germany
	At DESY in Hamburg an investigation was started to join aluminum chambers with stainless steel flanges by friction stir welding. First results will be presented. It will be shown that there is only a small effect of hardening in the contact zone at the stainless-steel side, a small amount of particles are given and the diffusion zone is about 3 microns, but with a very irregular effect on the structured junction. Because of that, the influence of the surface and the welding parameters on the process will be investigated in the future.
	Poster TUPH15 [2.530 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH15
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TUPH25	Morphologies of Oxygen-Free Titanium and Palladium/Titanium Thin Films: New Non-Evaporable Getter (NEG) Coatings	84
	T. Miyazawa Sokendai, The Graduate University for Advanced Studies, Tsukuba, Japan A.H. Hashimoto, M. Yamanaka NIMS, Tsukuba, Ibaraki, Japan T. Kikuchi, K. Mase KEK, Tsukuba, Japan
	Funding: This research was partly supported by a TIA-Kakehashi grant and by the Global Research Center for Environment and Energy based on Nanomaterials Science. Non-evaporable getter (NEG) coatings are ideal for maintaining an ultrahigh vacuum (UHV) in the range 10^'8 Pa and they are widely used for accelerators because they are oil free, magnetic-field free, vibration free, economical, space saving, and energy efficient. We recently fabricated new NEG coatings consisting of low-oxygen-content Ti or oxygen-free Pd/Ti by sublimation under a clean UHV in the range 10^'8 to 10^'7 Pa []. Here, we report the determination of the morphologies of these films by scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The Ti and Pd films had almost uniform thicknesses of about 1.3 'm and 50 nm, respectively, and the Pd film completely overcoated the Ti film. Both the Pd and Ti thin films were uniformly deposited in plane on the stainless steel 304L substrate and they had polycrystalline structures. The interface between the Pd and Ti thin films was not abrupt. T. Miyazawa, K. Tobishima, H. Kato, M. Kurihara, S. Ohno, T. Kikuchi, and K. Mase, Vac. Surf. Sci. 61, 227 (2018).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH25
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TUPH37	A New Sealing Technology for High Precision Wide Open UHV Vacuum Flange and Waveguide Connections With Metal Gaskets	125
	S. Vilcins, M. Holz DESY, Hamburg, Germany D.B. Bandke DESY Zeuthen, Zeuthen, Germany
	The European-XFEL X-Ray laser facility is located in Hamburg. Since its commissioning in September 2017, this large X-ray laser opens new research opportunities for industrial users and scientists. For many beam diagnostic devices ultra-high vacuum components with high mechanical precision and additional strict requirements on particle cleanliness were produced. A vacuum chamber for the bunch compressor (BC) with a cross section of 400 mm*40.5 mm made of stainless steel blocks 1.4429 (316 LN) has been installed. These chambers have inte-grated flange-connections for large VATSEAL® gaskets. The tolerances for these flanges are extremely tight to ensure save vacuum tight sealing. This contribution will report of a new technology for such large rectangular or other large flange surfaces. Furthermore this contribution will compare the present with this new technology. This new technology can be used as well for other vacuum flange metals like alumini-um or titanium. Using of this technology for applications under special conditions, like particle free applications due to the non-lubricated conditions, are conceivable.
	Poster TUPH37 [1.413 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH37
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Paper

Title

Page

Friction Stir Welding Attempts for UHV Applications: Stainless Steel/Aluminum

57

A. Ermakov, C. Martens, U. Naujoks
DESY, Hamburg, Germany

At DESY in Hamburg an investigation was started to join aluminum chambers with stainless steel flanges by friction stir welding. First results will be presented. It will be shown that there is only a small effect of hardening in the contact zone at the stainless-steel side, a small amount of particles are given and the diffusion zone is about 3 microns, but with a very irregular effect on the structured junction. Because of that, the influence of the surface and the welding parameters on the process will be investigated in the future.

Poster TUPH15 [2.530 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH15

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH25

Morphologies of Oxygen-Free Titanium and Palladium/Titanium Thin Films: New Non-Evaporable Getter (NEG) Coatings

84

T. Miyazawa
Sokendai, The Graduate University for Advanced Studies, Tsukuba, Japan
A.H. Hashimoto, M. Yamanaka
NIMS, Tsukuba, Ibaraki, Japan
T. Kikuchi, K. Mase
KEK, Tsukuba, Japan

Funding: This research was partly supported by a TIA-Kakehashi grant and by the Global Research Center for Environment and Energy based on Nanomaterials Science.
Non-evaporable getter (NEG) coatings are ideal for maintaining an ultrahigh vacuum (UHV) in the range 10^'8 Pa and they are widely used for accelerators because they are oil free, magnetic-field free, vibration free, economical, space saving, and energy efficient. We recently fabricated new NEG coatings consisting of low-oxygen-content Ti or oxygen-free Pd/Ti by sublimation under a clean UHV in the range 10^'8 to 10^'7 Pa [*]. Here, we report the determination of the morphologies of these films by scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The Ti and Pd films had almost uniform thicknesses of about 1.3 'm and 50 nm, respectively, and the Pd film completely overcoated the Ti film. Both the Pd and Ti thin films were uniformly deposited in plane on the stainless steel 304L substrate and they had polycrystalline structures. The interface between the Pd and Ti thin films was not abrupt.
* T. Miyazawa, K. Tobishima, H. Kato, M. Kurihara, S. Ohno, T. Kikuchi, and K. Mase, Vac. Surf. Sci. 61, 227 (2018).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH25

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH37

A New Sealing Technology for High Precision Wide Open UHV Vacuum Flange and Waveguide Connections With Metal Gaskets

125

S. Vilcins, M. Holz
DESY, Hamburg, Germany
D.B. Bandke
DESY Zeuthen, Zeuthen, Germany

The European-XFEL X-Ray laser facility is located in Hamburg. Since its commissioning in September 2017, this large X-ray laser opens new research opportunities for industrial users and scientists. For many beam diagnostic devices ultra-high vacuum components with high mechanical precision and additional strict requirements on particle cleanliness were produced. A vacuum chamber for the bunch compressor (BC) with a cross section of 400 mm*40.5 mm made of stainless steel blocks 1.4429 (316 LN) has been installed. These chambers have inte-grated flange-connections for large VATSEAL® gaskets. The tolerances for these flanges are extremely tight to ensure save vacuum tight sealing. This contribution will report of a new technology for such large rectangular or other large flange surfaces. Furthermore this contribution will compare the present with this new technology. This new technology can be used as well for other vacuum flange metals like alumini-um or titanium. Using of this technology for applications under special conditions, like particle free applications due to the non-lubricated conditions, are conceivable.

Poster TUPH37 [1.413 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH37

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)