Description
(combined session)
We present a model for the spread, transmission, and competition of skills in a population of individuals with finite life span and asexual reproduction. Emphasis is placed on the role of spatial mobility of individuals. In the initialization, individuals may have no skill or either skill A or B. Later on, individuals are born unskilled and may acquire skills by being taught from a skilled...
The coupled dynamics of the radial profiles (magnetic and kinetic) in a tokamak
are described by a set of non-linear partial differential equations. RAPTOR is a
control-oriented core transport code, solving these equations based on empirical
or first-principle-based models for the heat transport. The present work presents
the extension of RAPTOR to allow rapid calculation of consistent...
Non-thermal electron distributions can be generated by various means in magnetically confined plasmas. On TCV, non-thermal electron populations are routinely generated using electron cyclotron current drive (ECCD), in the presence of magnetohydrodynamic (MHD) instabilities and during disruptions. The kinetic energy of the non-thermal electrons can range from several tens to a few hundred kilo...
Understanding turbulence and anomalous transport in tokamaks remains an important open issue in plasma physics for fusion devices. A prominent feature of turbulence in the edge region of a plasma are coherent filamentary plasma structures that drift across the magnetic field lines at high velocities (~km/s).
In 2018, commissioned a Gas Puff Imaging (GPI) diagnostic at TCV. Data is acquired...
Cellulose is a carbohydrate present at least in the composition of food, paper, textile and wood. In wood it is the most abundant component. The thermal characteristics of the polysaccharide cellulose in relation to forest fire are mainly:
specific heat, exothermic decomposition (pyrolysis) onset temperatures, enthalpy of decomposition (pyrolysis), (self)-ignition temperature, heat of...
High-power laser oscillators are a simple, compact and reliable alternative to multi-stage laser amplifier systems. In particular, Kerr lens mode-locked (KLM) thin-disk laser (TDL) oscillators are capable of generating directly sub-100-femtosecond pulse durations at megahertz repetition rates and high average powers. Peak powers at the mega-watt level enable to drive non-linear processes...
Broadband and high-power THz radiation spanning several THz at mW power levels is so far available using highly complex multistage laser amplifier systems or large-scale facilities. We demonstrate a broadband THz source (spanning nearly 5 THz at 0.3 mW of average power) based on optical rectification in GaP driven directly by an ultrafast high-power thin-disk laser oscillator. The synergy of...
C$_2^-$ and other anionic molecules produced in an electric discharge in an Even-Lavie valve are accelerated to 1.8 keV in a pulsed electric field; the C$_2^-$ is then mass selected in a Wien filter. Subsequent deceleration in the static electric field of a resistive tube with a potential difference of 1.8 kV reduces the energy of the particles to a trappable range. A digital RF trap on the...
