89 research outputs found
First mock-up of the CBM STS module based on a new assembly concept
A molecular dynamics model has been developed to investigate the effect of the crystallographic orientation on the material deformation behaviors in nano- indentation/scratching of BCC iron. Two cases with different substrate orientations have been simulated. The orientations along x, y and z direction are [001], [100] and [010] for Case I and [111], [-1-12] and [1-10] for Case II, respectively. Case I and Case II exhibit different deformation patterns in the substrate. During indentation, the pile-up can be observed in Case I, but not in Case II. During scratching the pile-up ahead of the movement of the indenter has been enlarged in Case I, while a chip with the disordered atoms is generated in Case II. It has been found that Case I has both higher hardness and larger coefficient of friction. The ratios of the hardness and the coefficient of friction between cases I and II are nearly 2. The reason is attributed to the different crystallographic orientations used in both cases
Very low mass microcables for the ALICE silicon strip detector
Proposal of abstract for LEB99, Snowmass, Colorado, 20-24 September 1999The ALICE Inner Tracker (ITS) silicon strip layers will use kapton/aluminium microcables (12/14 um thickness) exclusively for all interconnections to and from the front-end chips and hybrids, completely eliminating traditional wirebonding. Benefits are increased robustness and an extra degree of dimensional freedom. Utilising a low-power, low temperature and low-force (10-15 grams) single-point TAB bonding process, aluminium traces are directly bonded through bonding windows in the kapton foil to bond pads on the chips and the hybrid. The same technique is also used to interconnect these microcables to create multi-layer bus structures with "bonded via's". A double-sided strip detector using prototype cables has been installed in the NA57 experiment in 1998
STRASSE: A Silicon Tracker for Quasi-free Scattering Measurements at the RIBF
STRASSE (Silicon Tracker for RAdioactive nuclei Studies at SAMURAI
Experiments) is a new detection system under construction for quasi-free
scattering (QFS) measurements at 200-250 MeV/nucleon at the RIBF facility of
the RIKEN Nishina Center. It consists of a charged-particle silicon tracker
coupled with a dedicated thick liquid hydrogen target (up to 150-mm long) in a
compact geometry to fit inside large scintillator or germanium arrays. Its
design was optimized for two types of studies using QFS: missing-mass
measurements and in-flight prompt -ray spectroscopy. This article
describes (i) the resolution requirements needed to go beyond the sensitivity
of existing systems for these two types of measurements, (ii) the conceptual
design of the system using detailed simulations of the setup and (iii) its
complete technical implementation and challenges. The final tracker aims at a
sub-mm reaction vertex resolution and is expected to reach a missing-mass
resolution below 2 MeV in for reactions when combined with
the CsI(Na) CATANA array.Comment: 25 pages, 29 figure
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