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Publications associées (127)

Nuclear technology aspects of ITER vessel-mounted diagnostics

ITER has diagnostics with machine protection, basic and advanced control, and physics roles. Several are distributed on the inner and outer periphery of the vacuum vessel. They have reduced maintainability compared to diagnostics in ports. They also endure ...

Elsevier2011

Use of webcams as tools for alignment and supervision of a Thomson scattering system in the near infrared

Basil Duval, Yanis Andrebe, Pierre Etienne, Roland Behn, Andreas Pitzschke

The alignment stability is a major concern for Thomson scattering systems. Even small angular deviations of the laser beams crossing the plasma lead to a loss of the calibration resulting in unreliable measurements of the electron density profile. For the ...

Elsevier2011

Influence of the Pump-Turbine Guide Vanes Vibrations on the Pressure Fluctuations in the Rotor-Stator Vaneless Gap

François Avellan, Mohamed Farhat, Vlad Hasmatuchi, Steven Roth, Francisco Botero

We investigate the Rotor-Stator Interaction in a pump-turbine reduced scale model by considering fluid-structure coupling. The pressure fluctuations amplitude in the rotor-stator vaneless gap has generally been shown to increase linearly with the operating ...

2011

Self-Pulsation at Zero Absorber Bias in GaN-Based Multisection Laser Diodes

Nicolas Grandjean, Jean-François Carlin, Julien Dorsaz, Luca Alex Milo Sulmoni

We study the influence of pump current and absorber bias voltage on the pulse width and frequency of sustained pulsation in GaN-based multisection laser diodes. The observed frequencies and pulse widths range from 1.5 to 4.5GHz and 90 to 18 ps, respectivel ...

2011

Hydrodynamics of High Specific Power Pumps for Off-Design Operating Conditions

Stefan Berten

Part load operation of high energy centrifugal pumps is associated with increased vibration levels which may adversely affect the machines operational safety. The main sources of vibrations in centrifugal pumps are of hydrodynamic nature. The interaction b ...

EPFL2010

Monitoring N719 Dye Configurations on (1 × n)-Reconstructed Anatase (100) by Means of STM: Reversible Configurational Changes upon Illumination

Ulf Anders Hagfeldt

We report exptl. results concerning the STM imaging of cis-bis (isothiocyanate)-bis-(2,2'-bipyridyl-4,4'dicarboxylate)ruthenium(II)bis(tetrabutylammonium) dye (known as N719) adsorbed on a single crystal of anatase TiO2(100). The cleaning pretreatment, by ...

2010

Efficient optimization of high vacuum chemical vapor deposition of niobium oxide on full wafer scale

Paul Muralt, Patrik Willi Hoffmann, Ali Dabirian, Yury Kuzminykh, Estelle Wagner, Scott Harada, Giacomo Benvenuti

A systematic study of niobium oxide deposition using niobium tetraethoxy-dimethyl-amino-ethoxide (Nb(OEt)(4)(dmae)) precursor is presented. The deposition process was conducted in a high-vacuum chemical vapor deposition machine with precursor flux gradient ...

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2010

Use of webcams as tools for alignment and supervision of a Thomson Scattering System in the near infrared

Basil Duval, Yanis Andrebe, Pierre Etienne, Roland Behn, Andreas Pitzschke

Fusion Engineering and Design2010

A high-reflectivity atom-focusing mirror stable at room temperature

It is shown that the Pb(root 3x root 3)R30/Si(111) ordered layer is an excellent mirror for neutral He atoms. It focuses more than 15% of the incoming He atoms into the specular peak, and is stable up to 450 K. Moreover, the reflectivity remains almost unc ...

American Institute of Physics2010

Grafting Crown Ether Alkali Host-Guest Complexes at Surfaces by Electrospray Ion Beam Deposition

Klaus Kern, Stephan Rauschenbach, Nicha Thontasen

The functionalization of surfaces with host guest compounds is promising for many applications, yet often limited by constraints such as the volatility of the functional compound or the lack of binding to the surface. We use electrospray ion beam depositio ...

2010

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