| 1. |
- Da Via, C, et al.
(författare)
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Lightwave Analogue Links For LHC Detector Front-ends
- 1994
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 344:1, s. 199-211
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Tidskriftsartikel (refereegranskat)abstract
- The requirements on optical links for transferring analog and digital signals from the detector front-ends to the readout electronics at future high-luminosity colliders are reviewed. The advantages of external modulation techniques are discussed. An outline is given of the the R&D programme recently started at CERN by a collaboration involving high-energy physics institutes, optoelectronics research laboratories and industry, in order to develop electro-optic intensity modulator arrays, particularly for analogue applications, and to investigate the feasibility of volume production. The design of multichannel demonstrators in lithium niobate and III-V semiconductor technology is described. Preliminary results of the performance measurements are presented.
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| 2. |
- Troive, Lars, et al.
(författare)
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Finite element simulation of the bending of a flat plate to U-shaped beam cross-section and neutron diffraction determination of residual stresses
- 1990
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Ingår i: Recent trends in welding science and technology. - Materials Park, Ohio : ASM International. ; , s. 107-111
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Konferensbidrag (refereegranskat)abstract
- Results of strains from finite element calculations and measurements by the neutron diffraction method in a hollow welded steel beam profile are presented. To calculate the residual strains, each step in the manufacturing process has to be simulated. The D-shaped beam profile is built up by a plate which is flanged into a U-cross-section profile and then welded together with a plate on the top edges. The finite element analysis includes simulation of the manufacturing of the cross-section by bending where large deformations are accounted for. Then, the finite element simulation of the welding pass follows. Plane strain conditions were assumed. The material was assumed to be thermoelastic--plastic, with temperature dependent mechanical material properties. To verify the calculations, measurements of strain were made at approx 40 points, in three orthogonal directions, using the neutron diffraction method. The neutron technique differs from the established X-ray diffraction in the way that the neutrons can penetrate substantial distances into the interior of components which the X-ray cannot. Graphs. 9 ref.-
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