Susumu Kato
(National Institute of Advanced Industrial Science and Technology)
06/11/2013, 14:30
High-power continuous-wave (CW) lasers are used in many industries, including laser processing, fiber-optic communication, and laser display. Laser-induced breakdown damage in optical materials limits the laser power. We propose a nonlinear absorption mechanism in optical crystals under CW laser irradiation. The absorption mechanism works for catastrophic CW laser breakdown in an optical...
Ana Teresa Perez Fontenla
(Universidad Nacional de Educacion a Distancia UNED)
06/11/2013, 14:30
In the frame of the CLIC (Compact Lineal Collider) Study, we are especially interested in a better understanding of the superficial modifications on oxygen free electronic copper (Cu-OFE) caused by the interaction with vacuum arcs at high gradient operation. Radio-frequency breakdown (BKD) phenomena are responsible of some of the surface damages observed in CLIC accelerate structures which are...
Benjamin Baum
(TU Darmstadt)
06/11/2013, 14:30
Vacuum circuit breakers (VCB) are well established in the distribution voltage level (up to 52 kV) of the electrical power supply system. In order to establish this technology at higher voltages, which may be desirable in order to reduce the use of sulfur-hexafluoride, the usual insulating and arc quenching medium in high-voltage circuit breakers, the dielectric withstand reliability –...
Anders Jaakko Korsback
(University of Helsinki (FI)),
Iaroslava Profatilova
(Nat. Acad. Sci., Inst. Appl. Phys. (UA)),
Nicholas Shipman
(University of Manchester (GB)),
Tomoko Muranaka
(CERN)
06/11/2013, 14:30
DC spark systems are used at the CLIC group at CERN to study electrical breakdown in vacuum. Recent instrumentation developments are presented. Capacitive gap distance measurement has been implemented to allow non-contact setting and feedback control of gap distance. Temperature control has been implemented to allow for the study of the effect of temperature on breakdown rate. Optical...
Simon Vigonski
(University of Tartu)
06/11/2013, 14:30
Spherical Fe precipitates were simulated with MD in Cu under high electric fields to investigate their effect on dislocations in the Cu lattice. Different depths of the precipitates were studied. Fe precipitates were also placed on Cu grain boundaries.
Iaroslava Profatilova
(Nat. Acad. Sci., Inst. Appl. Phys. (UA))
06/11/2013, 14:30
Optical spectroscopy is a powerful diagnostic method for investigating plasma and surfase processes in a breakdown. Optical spectrometer used in combination with DC system at the CLIC group at CERN for studying breakdown. Description of experimental setup are presented. Spectra of DC breakdown between copper electrodes are produced.
Hugo Alistair Day
(University of Manchester (GB)), Dr
Mike Barnes
(CERN)
06/11/2013, 14:30
The LHC injection kicker magnets include beam screens to shield the ferrite yoke against the effects of the high intensity beam: the screening is provided by conductors lodged in the inner wall of a high purity alumina support tube. The alumina must have a low rate of flashover. This screening will be further improved by additional conductors; however these must not compromise the good...
Flyura Djurabekova
(University of Helsinki),
Ville Jansson
(University of Helsiniki)
06/11/2013, 14:30
Object Kinetic Monte Carlo (OKMC) is a stochastic simulation method, suitable for modelling of systems were the processes are on a time scale of seconds to years. The
general method of OKMC will be presented based on an example of evolution of nanostructure in model alloys of steels employed in reactor pressure vessels of nuclear reactors. We will discuss the possibilities and restrictions of...
Nicola Pilan
(Consorzio RFX)
06/11/2013, 14:30
The work is aimed at proposing a criterion for the DC voltage breakdown prediction of a complex system insulated by large vacuum gaps , the model is based on the implementation of the micro particle (clump) induced breakdown Cranberg-Slivkov theory into a statistical approach
