Development of titanium nitride coating for SNS ring vacuum chambers

He, P.; Hseuh, H.C.; Mapes, M.; Todd, R.; Weiss, Daniel H.

doi:10.1109/pac.2001.987309

Cited by 16 publications

(17 citation statements)

References 2 publications

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“…making grooves) [3,16]; (c) Coating with low SEY materials (such as TiN [17], NEG [18] and amorphous carbon (a-C) [19]); (d) Coating with low SEY microstructure (ex. : copper black, gold black; columnar NEG) [20,21,22]; (f) Various combinations of above.…”

Section: Introductionmentioning

confidence: 99%

Reduction of secondary electron yield for E-cloud mitigation by laser ablation surface engineering

Valizadeh

Malyshev

Wang

et al. 2017

Applied Surface Science

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Developing a surface with low Secondary Electron Yield (SEY) is one of the main ways of mitigating electron cloud and beam-induced electron multipacting in high-energy charged particle accelerators. In our previous publications, a low SEY< 0.9 for as-received metal surfaces modified by a nanosecond pulsed laser was reported. In this paper, the SEY of laser-treated blackened copper has been investigated as a function of different laser irradiation parameters. We explore and study the influence of micro-and nano-structures induced by laser surface treatment in air of copper samples as a function of various laser irradiation parameters such as peak power, laser wavelength ( = 355 nm and 1064 nm), number of pulses per point (scan speed and repetition rate) and fluence, on the SEY. The surface chemical composition was determined by x-ray photoelectron spectroscopy (XPS) which revealed that heating resulted in diffusion of oxygen into the bulk and induced the transformation of CuO to sub-stoichiometric oxide. The surface topography was examined with high resolution scanning electron microscopy (HRSEM) which showed that the laser-treated surfaces are dominated by microstructure grooves and nanostructure features.

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Section: Introductionmentioning

confidence: 99%

Reduction of secondary electron yield for E-cloud mitigation by laser ablation surface engineering

Valizadeh

Malyshev

Wang

et al. 2017

Applied Surface Science

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“…[2] For this application, a cathode was developed which produced TiN films of good uniformity and composition. Commercially available Alnico magnets l_" diameter and 2" in length were inserted in a l_" diameter tubing (grade-2 Ti or OFHC Cu).…”

Section: Coating Methodsmentioning

confidence: 99%

Metallization of ceramic vacuum chambers for SNS ring injection kicker magnets

He¹,

Hseuh²,

Todd³

2002

Thin Solid Films

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AbstraclCeramic chambers will beused inthe pulsed kicker magnets forthe injectionof Hinto the US Spallation Neutron Source (SNS)accumulator ring. There are two reasons for using ceramic chambers in kickers: (1) to avoid shielding of a fast-changing external magnetic field by metallic chamber walls; and(2) to reduce heating due to eddy currents.The inner surfaces of the ceramic chambers will be coated with a conductive layer, possibly titanium or copper(Cu) with a titanium nitride(TiN) overlayer, to reduce the beam coupling impedance and provide passage for beam image current. This paper describes the development of sputtering method for the 0.83m long 16cm inner diameter ceramic chambers. Coatings of Ti, Cu and TiN with thicknesses up to 10~m were produced by means of DC magnetron sputtering. The difficulty of coating insulators was overcome with the introduction of an anode screen. Films with good adhesion, uniform longitudinal thickness, and conductivity were produced.

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“…The TiN coatings measured here were deposited at Brookhaven National Laboratory (BNL) onto 6063 aluminium alloy substrates (TiN/Al) and onto type 304 stainless steel substrate (TiN/SS), using the same procedure and setup described in [9]. The expected film thickness was around 1000Å.…”

Section: Variation Of the Sey Of As Received Tin Filmsmentioning

confidence: 99%

“…Again, the thickest samples display the lowest values for the SEY. All of these films were coated in one run, in the same setup, following the procedure described in [9]. The thicknesses of the samples should be identical.…”

Section: Variation Of the Sey Of As Received Tin Filmsmentioning

confidence: 99%

TiN and TiZrV Thin Film as a Remedy Against Electron Cloud

Pimpec¹

2005

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In many accelerators running positively charged beams, ionization of residual gas and secondary electron emission in the beam pipe will give rise to an electron cloud which can cause beam blow-up or the loss of the circulating beam. One solution to avoid the electron cloud is to ensure that the vacuum wall has low secondary emission yield (SEY). The SEY of thin films of TiN and sputter-deposited non-evaporable getter were measured for a variety of conditions, including the effect of recontamination in an ultra high vacuum environment. Submitted to the journal Nuclear Instruments and Methods in Physics Research AbstractIn many accelerators running positively charged beams, ionization of residual gas and secondary electron emission in the beam pipe will give rise to an electron cloud which can cause beam blow-up or the loss of the circulating beam. One solution to avoid the electron cloud is to ensure that the vacuum wall has low secondary emission yield (SEY). The SEY of thin films of TiN and sputter-deposited nonevaporable getter were measured for a variety of conditions, including the effect of recontamination in an ultra high vacuum environment.

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Development of titanium nitride coating for SNS ring vacuum chambers

Cited by 16 publications

References 2 publications

Reduction of secondary electron yield for E-cloud mitigation by laser ablation surface engineering

Reduction of secondary electron yield for E-cloud mitigation by laser ablation surface engineering

Metallization of ceramic vacuum chambers for SNS ring injection kicker magnets

TiN and TiZrV Thin Film as a Remedy Against Electron Cloud

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