Sebuah tesis dari ETH Zurich bertajuk “Determination of a precise gravity field for the CLIC feasibility study”. Tesis DSc oleh Sebastien Guillaume pada 2015. Kajian memfokus pengukuran geodesi yang melibatkan geodesi fizikal dan graviti untuk projek membina kompleks accelerator atom. Source – link.
Summary kajian menyebut:
This work is part of the studies conducted by CERN as part of a project for a future electron-positron linear collider (CLIC) of 50 km. In particular, it addresses a specific aspect related to its pre-alignment in the vertical dimension. In fact, in order to ensure a high collision probability of incident particles (called luminosity), it is necessary that the diameter of the beams, at the collision point after 25 km of continuous acceleration, do not exceed a few nanometers. This is only possible if some technical constraints are fulfilled. One of them concerns the accuracy for the pre-alignment of quadrupoles along the whole machine. This alignment must be related to a straight line in Euclidean space with a precision of 10 microns over 200 meters sliding window. In practice, this can only be envisaged if a positioning system is capable to determine positions at this level of accuracy. In vertical, hydrostatic levelling systems (HLS) benefit of several advantages and represent serious candidates. In addition to their sub-micrometric resolution, HLS are robust and appear to be particularly reliable with respect to radiations. However, they are unable to realize a Euclidean straight line. Indeed, they are related to the surface of the fluid in hydrostatic equilibrium, connecting the different sensors, whose geometry is an equipotential of the Earth’s gravity field.
Kampus ETH Zurich
Baca “ETH Zurich to fire astronomy professor over unprofessional conduct”. science business 2017 – link.
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