Stefan Wackerow
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View article: Enhanced antibacterial and corrosion resistance performance of fluorine-doped diamond-like carbon coatings on 316 L stainless steel
Enhanced antibacterial and corrosion resistance performance of fluorine-doped diamond-like carbon coatings on 316 L stainless steel Open
Biomedical materials must meet increasingly stringent standards for antibacterial efficacy and corrosion resistance. This study investigates the enhancement of these properties in 316 L stainless steel through the application of fluorine-d…
View article: Ferrites with a Minimized Secondary Electron Yield
Ferrites with a Minimized Secondary Electron Yield Open
Ferrites are an essential material in modern industry due to their exceptional magnetic properties and high resistivity. Many applications of ferrites necessitate exposure to high energy electrons, particularly space science and particle a…
View article: Influence of nanoparticulates and microgrooves on the secondary electron yield and electrical resistance of laser-treated copper surfaces
Influence of nanoparticulates and microgrooves on the secondary electron yield and electrical resistance of laser-treated copper surfaces Open
Laser surface structuring has proven to be an effective technique for achieving a copper surface with secondary electron yield (SEY) values close to or below unity. However, the attributes that minimize SEY, such as moderately deep grooves…
View article: Hybrid Antibacterial Surfaces: Combining Laser‐Induced Periodic Surface Structures with Polydopamine‐Chitosan‐Silver Nanoparticle Nanocomposite Coating
Hybrid Antibacterial Surfaces: Combining Laser‐Induced Periodic Surface Structures with Polydopamine‐Chitosan‐Silver Nanoparticle Nanocomposite Coating Open
Bacterial biofilm‐associated infections are a persistent and growing problem, further exacerbated by the rapid development of antibiotic‐resistant bacterial strains. Antibacterial surfaces hold great potential for controlling the survival,…
View article: Modelling laser modified secondary electron yield response of surfaces
Modelling laser modified secondary electron yield response of surfaces Open
Electron clouds hinder the operation of particle accelerators. In the Large Hadron Collider (LHC), the copper beam screens are located within close proximity to the beam path, resulting in beam-induced electron multipacting, which is the m…
View article: RF Characterisation of Laser Treated Copper Surfaces for the Mitigation of Electron Cloud in Accelerators
RF Characterisation of Laser Treated Copper Surfaces for the Mitigation of Electron Cloud in Accelerators Open
In accelerator beam chambers and RF waveguides, electron cloud and multipacting can be mitigated effectively by reducing the secondary electron yield (SEY). In recent years, it has been established that laser-engineered surface structuring…
View article: Picosecond pulsed 532 nm laser system for roughening and secondary electron yield reduction of inner surfaces of up to 15 m long tubes
Picosecond pulsed 532 nm laser system for roughening and secondary electron yield reduction of inner surfaces of up to 15 m long tubes Open
Laser-induced surface structuring is a promising method to suppress electron mulitpacting in the vacuum pipes of particle accelerators. Electrons are scattered inside the rough surface structure, resulting in a low Secondary Electron Yield…
View article: Surface Structure Modelling for Laser-Assisted Reduction of SEY
Surface Structure Modelling for Laser-Assisted Reduction of SEY Open
Systems operating under vacuum conditions in the presence of alternating magnetic fields such as particle accelerators are susceptible to electron clouds thus limiting their performance. In the Large Hadron Collider (LHC), electron clouds …
View article: Out of focus ultrafast processing of metals for reduced secondary electron yield
Out of focus ultrafast processing of metals for reduced secondary electron yield Open
We have demonstrated out-of-focus ultrafast pulsed laser processing of copper with a variable working distance, without the need for mechanical movement. This was achieved by employing a diffractive optical element. The method has been dem…
View article: Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films
Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films Open
The formation of a fissured copper surface by picosecond pulsed laser irradiation is combined with functional coatings consisting of Ti and amorphous carbon layers or a Ti–Zr–V compound film to fabricate surfaces with the maximum of the se…
View article: High performance SERS platforms via parametric optimization of the laser-assisted photodeposition of silver and gold nanoparticles
High performance SERS platforms via parametric optimization of the laser-assisted photodeposition of silver and gold nanoparticles Open
Parametric optimization of the laser-assisted photocatalytic growth of Ag and Au nanoparticles for high SERS enhancement factor performance informed by design of experiment is demonstrated. The photodeposition process was divided into two …
View article: Optimization of the secondary electron yield of laser-structured copper surfaces at room and cryogenic temperature
Optimization of the secondary electron yield of laser-structured copper surfaces at room and cryogenic temperature Open
Electron cloud (e-cloud) mitigation is an essential requirement for proton circular accelerators in order to guarantee beam stability at a high intensity and limit the heat load on cryogenic sections. Laser-engineered surface structuring i…
View article: Nanosecond Laser Surface Silver Metallization of Wet Ion Exchanged Glasses
Nanosecond Laser Surface Silver Metallization of Wet Ion Exchanged Glasses Open
Silver ions are embedded in glass slides by a traditional “wet” ion exchange technique. The glass slides irradiation by 10 ns laser pulses at 355 nm wavelength leads to the formation of metal-like film at the surface. Scanning electron mic…
View article: High-performance thermal emitters based on laser-engineered metal surfaces
High-performance thermal emitters based on laser-engineered metal surfaces Open
Effective thermal management is of paramount importance for all high-temperature systems operating under vacuum. Cooling of such systems relies mainly on radiative heat transfer requiring high spectral emissivity of surfaces, which is stro…
View article: Cryogenic surface resistance of copper: Investigation of the impact of surface treatments for secondary electron yield reduction
Cryogenic surface resistance of copper: Investigation of the impact of surface treatments for secondary electron yield reduction Open
The surface resistance of copper samples with an amorphous carbon (a-C) coating or with laser surface structuring, the surface treatments of choice for electron cloud suppression in critical cryogenic sectors of the high-luminosity upgrade…
View article: First beam test of Laser Engineered Surface Structures (LESS) at cryogenic temperature in CERN SPS accelerator
First beam test of Laser Engineered Surface Structures (LESS) at cryogenic temperature in CERN SPS accelerator Open
Electron cloud mitigation is an essential requirement for accelerators of positive particles with high intensity beams to guarantee beam stability and limited heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) are b…
View article: Towards Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation
Towards Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation Open
The LHC operation has proven that the electron cloud could be a significant limiting factor in machine performance, in particular for future High Luminosity LHC (HL-LHC) beams. Electron clouds, generated by electron multipacting in the bea…
View article: First Beam Test of Laser Engineered Surface Structures (LESS) at Cryogenic Temperature in CERN SPS Accelerator
First Beam Test of Laser Engineered Surface Structures (LESS) at Cryogenic Temperature in CERN SPS Accelerator Open
Electron cloud mitigation is an essential requirement for accelerators of positive particles with high intensity beams to guarantee beam stability and limited heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) are b…
View article: First accelerator test of vacuum components with laser-engineered surfaces for electron-cloud mitigation
First accelerator test of vacuum components with laser-engineered surfaces for electron-cloud mitigation Open
Electron cloud mitigation is an essential requirement for high-intensity proton circular accelerators. Among other solutions, laser engineered surface structures (LESS) present the advantages of having potentially a very low secondary elec…