Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Andrzej Szczepkowicz"'
Autor:
Yen-Chieh Huang, Luo-Hao Peng, Hossein Shirvani, Wen-Chi Chen, Karthickraj Muthuramalingam, Wei-Chih Wang, Andrzej Szczepkowicz
Publikováno v:
APL Photonics, Vol 7, Iss 9, Pp 096101-096101-10 (2022)
A conventional free-electron laser is useful but large, driven by a beam with many relativistic electrons. Although, recently, keV electron beams have been used to excite broadband radiation from material chips, there remains a quest for a chip-size
Externí odkaz:
https://doaj.org/article/a730aa74c252462ea2547b9d69ea4d7b
Autor:
Andrzej Szczepkowicz
Publikováno v:
Physical Review Accelerators and Beams, Vol 20, Iss 8, p 081302 (2017)
The question of suitability of transfer matrix description of electrons traversing grating-type dielectric laser acceleration (DLA) structures is addressed. It is shown that although matrix considerations lead to interesting insights, the basic trans
Externí odkaz:
https://doaj.org/article/a5cef279d9b34c9c83dca47bf823b62e
The intensity of Smith-Purcell radiation from metallic and dielectric gratings (silicon, silica) is compared in a frequency-domain simulation. The numerical model is discussed and verified with the Frank-Tamm formula for Cherenkov radiation. For 30 k
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1ab7e011baae90336b1a15ae6568ebda
http://arxiv.org/abs/2009.03811
http://arxiv.org/abs/2009.03811
Autor:
Andrzej Szczepkowicz
The notions of acceleration gradient and deflection gradient are generalized to phasor quantities (complex-valued functions) in the context of dielectric laser acceleration (DLA). It is shown that the electromagnetic forces imparted on a near-resonan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47e45c8567d9e5e904f18ee155122b17
Autor:
Andrzej Szczepkowicz
Publikováno v:
Surface Science. 606:202-208
The coarsening kinetics of steplike faceted O/W(332) surface is investigated using field ion microscopy. The spatial density of facets is measured as a function of time (10–320 s) and temperature (1100–1400 K). The results are discussed in terms
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74848d081ffef89b36cbd9dc9f236afd
https://doi.org/10.1016/j.susc.2011.09.020
https://doi.org/10.1016/j.susc.2011.09.020
Publikováno v:
Ultramicroscopy. 112:1-9
Multi-scale simulations of field ion microscopy images of faceted and hemispherical samples are performed using a 3D model. It is shown that faceted crystals have compressed images even in cases with no shank. The presence of the shank increases the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9cad436a4ebe0a7a4c87ad0e2747f33
https://doi.org/10.1016/j.ultramic.2011.10.007
https://doi.org/10.1016/j.ultramic.2011.10.007
Autor:
Robert Bryl, Andrzej Szczepkowicz
Publikováno v:
Applied Surface Science. 252:8526-8532
The oxygen induced faceting of the macroscopic W[1 1 1] tip has been studied for oxygen exposures in the range 0.5–31 L and annealing temperatures 800–1800 K using the field ion microscopy (FIM) technique. After annealing at temperatures lower th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::611257ec509249606646169980af2803
https://doi.org/10.1016/j.apsusc.2005.11.068
https://doi.org/10.1016/j.apsusc.2005.11.068
Autor:
Andrzej Szczepkowicz, Robert Bryl, Theodore E. Madey, Antoni Ciszewski, Cheng-Hsun Nien, Czesław Oleksy, Qifei Wu
Publikováno v:
Surface Science. 599:55-68
Adsorbate-induced thermal faceting on flat and curved crystal surfaces is compared. Two adsorption systems are investigated: O/W and Pd/W. Each of these systems is studied by two experimental techniques: scanning tunneling microscopy (flat surface),
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c6dd7d09c5987a7e443f641a9478733
https://doi.org/10.1016/j.susc.2005.09.036
https://doi.org/10.1016/j.susc.2005.09.036
Autor:
Robert Bryl, Andrzej Szczepkowicz
Publikováno v:
Applied Surface Science. 241:431-434
The macroscopic W[1 1 1] tip facets and forms a truncated three-sided pyramid when annealed at 1400–1600 K after being exposed to about 1.3 Langmuir of oxygen. Further annealing of the tip in temperature range of 1000–1060 K leads to significant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae0d0fd6fd57e3e80a32b66fe343ff74
https://doi.org/10.1016/j.apsusc.2004.07.041
https://doi.org/10.1016/j.apsusc.2004.07.041
Autor:
Andrzej Szczepkowicz, Robert Bryl
Publikováno v:
Surface Science. 559:L169-L172
A tungsten crystal with a curved surface (radius of curvature = 0.2 μm), exposed to 1.3 ± 0.2 L of oxygen, undergoes massive atomic rearrangement upon annealing. Hill-and-valley faceting in the form of {2 1 1} steps is observed between (2 1 1)–(1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b8467c1f3301de85ac6b41dca5bf40e
https://doi.org/10.1016/j.susc.2004.04.035
https://doi.org/10.1016/j.susc.2004.04.035