Zobrazeno 1 - 10
of 86
pro vyhledávání: '"Michelle D. Shinn"'
Publikováno v:
Applied Surface Science. 253:8041-8044
Titanium was laser nitrided by means of free-electron laser irradiation in pure nitrogen atmosphere. The variation of pulse frequency and macropulse duration of the free electron laser resulted in δ-TiNx coatings with different thickness and differe
Autor:
L.A. Dillon-Townes, A. Grippo, N. Nishimori, Robin J. Evans, T. Siggins, C. Behre, Robert Rimmer, Kevin Jordan, David Hardy, James Coleman, H. F. Dylla, W. Moore, M. Bevins, Eduard Pozdeyev, Shukui Zhang, Joseph Preble, D. Gruber, Lia Merminga, Carlos Hernandez-Garcia, Gwyn P. Williams, M. J. Kelley, Stephen V. Benson, James Boyce, Michelle D. Shinn, J. Mammosser, R. Walker, David Douglas, Chris Tennant, G.H. Biallas, Joseph Gubeli, George R. Neil
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 557:9-15
A new THz/IR/UV photon source at Jefferson Lab is the first of a new generation of light sources based on an Energy-Recovered, (superconducting) Linac (ERL). The machine has a 160 MeV electron beam and an average current of 10 mA in 75 MHz repetition
Publikováno v:
Applied Surface Science. 247:307-312
Surface treatment by means of pulsed laser beams in reactive atmospheres is an attractive technique to enhance the surface features, such as corrosion, wear resistances and hardness. Among all laser types, the free-electron laser (FEL) is relatively
Publikováno v:
Applied Physics A. 80:1707-1710
Titanium substrates were irradiated in pure nitrogen gas by means of a free-electron laser. The treatment resulted in the formation of δ-TiNx coatings, with surface stoichiometry x≈1 and thickness of about 15 μm. Under specific experimental condi
Publikováno v:
International Journal of Heat and Mass Transfer. 47:2261-2268
Ultrafast time-resolved pump–probe studies of energy relaxation and transport in polycrystalline single and multi-layer metal films are presented. The dependence of the surface electron temperature on the film structure was investigated. Vanadium w
Autor:
S.V. Benson, E. Feldl, G.R. Baker, George R. Neil, M. Bevins, F.D. Martin, C. Behre, L.A. Dillon-Townes, Joseph Gubeli, Ronald Lassiter, H. F. Dylla, Michelle D. Shinn
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 507:196-199
Jefferson Lab is in the process of upgrading the Free-Electron Laser Facility to provide higher output power as well as broader wavelength and timing flexibility. As part of the upgrade, a new optical cavity is being constructed. Using a near-concent
Publikováno v:
Applied Surface Science. 186:195-199
Surface coatings and thin films can be easily produced by irradiation of materials with short laser pulses in (reactive) gas atmospheres, e.g. nitrided iron and steel or AlN films on Al and its alloys by irradiation with an excimer laser in nitrogen
Autor:
Vitaly Gruzdev, Michelle D. Shinn
Publikováno v:
Optical Engineering. 56:011000
Laser damage of optical materials, first reported in 1964, continues to limit the output energy and power of pulsed and continuous-wave laser systems. In spite of some 48 years of research in this area, interest from the international laser community
Autor:
James Boyce, Shukui Zhang, Pavel Evtushenko, Michelle D. Shinn, Gustavious P. Williams, Carlos Hernandez-Garcia, S.V. Benson, David Douglas, J. M. Klopf, Chris Tennant, F. E. Hannon, George R. Neil
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 649:9-11
Jefferson Lab operates a pair of oscillator-based continuous-wave Free Electron Lasers (FELs) as a linac-based next generation light source with pulse repetition rates up to 75 MHz. The facility uses an energy recovered linac design for efficiency of
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 475:531-536
During commissioning of the IR Demo FEL at Jefferson Lab, we noticed that the FEL exhibited a rapid power drop with time when the first set of 3 mu-m mirrors was used. Thought the rate of power drop was unexpected, it was thought that it could be due