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Instrumental developments

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Involved people : all MADIR group, CIRIL staff, Design office and mechanical workshop

During the past years, MADIR group has been strongly involved in some instrumental developments for our research activities, with the support of all the technical staffs (mechanical workshop and electronical). This allows us to develop unique in-situ instruments. Moreover, we also collaborate to the developments of setup for other laboratories (PICOLIBS for fusion application with CORIA-Rouen, MiniMécaSiC with CEA Saclay).

ALIX diffractometer set up at IRRSUD beam line at GANIL. 1) Ion beam, 2) Turbomolecular pump, 3) Window for diffracted X-rays, 4) Window for incident X-rays and 5) X-ray generator.
C. Grygiel, H. Lebius, S. Bouffard, A. Quentin, J. M. Ramillon, T. Madi, S. Guillous, T. Been, P. Guinement, D. Lelièvre, and I. Monnet,RSI 83, 013902 (2012)

A Bruker D8 Discover diffractometer in θ/θ geometry with a Göbel mirror was adapted to IRRSUD beam line in order to perform in-situ X-ray diffraction measurements with a very good resolution. The goniometer was specifically tilted to 18°, so the -5°-190° is measurable in grazing incidence geometry or in classical theta-2theta. The parallel X-ray beam enables grazing incidence diffraction with suitable angle control due to its low divergence, besides an enhancement of the X-ray beam intensity. The 1D detector, Vantec-1, with a 12° window lets get simultaneous irradiation and diffraction measurements over a large diffraction angle range, therefore minimising the necessary beamtime at the facility. The detector allows quick scans with a good signal-to-background ratio using an effective energy discrimination between X-rays from diffraction and from ion-target interaction.

A dedicated beam line to irradiate samples at UHV conditions and subsequently study them in-situ under an AFM is in the process of being set up. This will allow studying irradiation effects on reactive surfaces. A UHV hexapod will extend this to irradiations under extreme grazing angles, smaller than a tenth of a degree.
Using our knowledge for experimental studies of sputtering processes, we have created a new set-up specifically dedicated to the study of plasma-relevant sputter processes. The set-up allows the measurement of total, ejection-angle-differential sputter rates by very slow ions. By putting the cleaning of the catcher and the measurement of the ejected material density in an UHV environment, typical impurities in catcher-type set-ups were avoided. In a first publication, sputter rates of Carbon and Tungsten targets with slow ions were studied. With this set-up it will be possible to use real tokamak tiles at different temperatures.

SPORT setup for in-situ emission spectroscopy
E. Gardes, E. Balanzat, B. Ban-d’Etat, A. Cassimi, F. Durantel, C. Grygiel, T. Madi, I. Monnet, J-M. Ramillon, F. Ropars and H. Lebius, NIM B 297, 39-43 (2013)

The SPORT set-up (time-resolved optical spectrometer, SPectroscopie Optique Résolue en Temps), is a new sub-nanosecond time-resolved instrument dedicated to studying the dynamics of UV–visible luminescence, at variable temperature (down to 7.5 K), under high stopping power of heavy ion irradiation. An ion detector located in the beam line delivers the start pulse for the delay time measurements of the photon emission, in a typical “time-of-flight” electronics. The detection consists of two optical branches, each with mirrors focusing onto spectrographs with ACH grating and 16-channel photomultipliers. Spectrographs and photomultipliers on each branch are optimized to different wavelengths ; together they cover the UV-visible spectrum. Two different TDCs are used, in order to cover emission delays from several ns to several ms.

The IGLIAS setup is an ultrahigh vacuum chamber equipped with a cold head dedicated to astrophysiocal ices studies in construction…

PELIICAEN (collaboration between MADIR, AMA, SIMUL and Orsay Physics, Aix-en-Provence, coordinator S. Guillous) : The aim of the PELIICAEN project is to develop an innovative experimental set-up allowing creation, modification and analysis of nano-structures and their controlled 3-D doping. We propose a new approach, combining known technologies, based on FIB and ECRIS techniques, to produce focused ion beams with a much larger choice of ion species and implantation technique than presently attainable.