The research "Solaris', tests the reliability of holographic materials intended for outdoor use in the fields of architecture, public art and advertising. It demonstrates the damage that can be caused to the materials through exposure to ultraviolet light, heat and humidity, and proposes solutions employing laminating techniques or chemical processes. As a result, we are now able to make spatial and temporal use of sunlight, so as to convey ideas and virtual images in open-air public spaces.

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The LHC machine will incorporate some 2000 main ring super-conducting magnets cooled at 1.9 K by super-fluid pressurized helium, mainly 15m-long dipoles with their cryostats and 6m-long quadrupoles housed in the Short Straight Section (SSS) units. This paper presents the design of the support system of the LHC arc cryo-magnets between 1.9 K at the cold mass and 293 K at the cryostat vacuum vessel. The stringent positioning precision for magnet alignment and the high thermal performance for cryogenic efficiency are the main conflicting requirements, which have lead to a trade-off design. The systems retained for LHC are based on column-type supports positioned in the vertical plane of the magnets inside the cryostats. An ad-hoc design has been achieved both for cryo-dipoles and SSS. Each column is composed of a main tubular thin-walled structure in composite material (glass-fibre/epoxy resin, for its low thermal conductivity properties), interfaced to both magnet and cryostat via stainless steel flanges. The thermal performance of the support is improved by intercepting part of the conduction heat at two intermediate temperature levels (one at 50-75 K and the other at 4.5-20 K). These intercepts, on the composite column, are thermally connected to the helium gas cooled thermal shield and radiation screen of the cryomagnet. An overview of the design requirements is given, together with an appreciation of the system design. Particular attention is dedicated to the support system of the SSS where the positioning precision of the quadrupole magnet is the most critical.

Centre d'art ho1ographiqi et photoniqi de Montré1 7255 rt A1er1ra, bureau203 Montréal, H2R 2Y9, Qiá. Canada Abstrt T1 paper I vish to present is tka corr.1iionof the or presented in t procethngs of t last Interxtioni1 Symposium on Display Holography, (SPIE vol 1600, 1991) It viii cortliiied, in a certain vay, tI eii of a long process. What I vish to present to t1 aiIIerce h to do vith tk recortrition of a ho1ograpkc slit thnition. This athnition inio1ied 240 holographic slits of real athmation done vith a holographic can It vull derrtrate t different ris au! solutior involved in the cortii:tion of tt SVH (Holographic vislizalion system). It vu shov t york comp1is1 by t teaming of an artist aril a ennrr, I viii o present tk retion of t public that h1 t) opportunity to try this system during my lt exhIbition. I vill corili1e vIth a deription of t different possibilities thit can be dora vith this kurI of york. Sunlay, t 9 of May 1993 Dear Micbel I pant to tell u thtt from bere I sthii at this monnt, t only thing tt r1ly interest n is tbe flight of tbe birds. From vlare I am presently, w1er a tall maple trw, in tbe midst of a varm breeze I realise that it's possible to forget everything. So should it be vith life, a combixtIon of long still nnnts. But before I corentrate myself into long hours of rrditation, before I reech that point, I rntt finish sorr of my proct arid also vrite this article for SPIE of Qbec. Knoving that I vill have to smak in front of an aiidiene at tbe end of this very day, I've decided to reed tm this letter that Im vriting you. 62

Centre d'artholographique etphotothque 5294 De LEsplanade, Montréal, Qué. H2T 2Z5 Canada ABSTRA This paper is based on my experiences in holography. It wilt explain, from the beginning, different steps of a research on movement and holography, from production of stereograms to the production of a holographic slits animation. Being an aitist, working alone as an independant with different grants, my last project will have taken almostsevenyearstobe completlyaccomplish. From the very beginning, the firstidea thatgenerated this project, to the end, the construction of the final displayer, three engineers, one electronic specialist, one programmer and many others will have work to find the best solutions forthe wellbeing of this project.258