The tracker system of the CMS project at CERN Laboratory is composed by different particle detectors separated by very narrow distances. The proper operation of the detector as a whole, requires several heating and cooling circuits and innovative solutions to fulfil the thermal constraints required by each part of the system. In this paper are reported the results of a study concerning the design of a screen whose task is to insulate a cold area (silicon detectors) from a warmer area in which different detectors operate at higher temperatures. Two different solutions are proposed: both designs refer to a screen realised as a thin cylindrical shell with external and internal sides acting as “active” surfaces, where heat flux and temperature can be imposed. A proposal of module subdivision and of channel layout is presented, with two solutions that differ, from each other, from the point of view of the cold side fluid (single phase or two-phase evaporating fluid). Pressure drops and heat transfer coefficients are estimated for a wide range of geometrical and physical parameter values.

Thermo-hydraulic design of the thermal screen of Cms particle detector at Cern laboratory

FOSSA, MARCO;
2000

Abstract

The tracker system of the CMS project at CERN Laboratory is composed by different particle detectors separated by very narrow distances. The proper operation of the detector as a whole, requires several heating and cooling circuits and innovative solutions to fulfil the thermal constraints required by each part of the system. In this paper are reported the results of a study concerning the design of a screen whose task is to insulate a cold area (silicon detectors) from a warmer area in which different detectors operate at higher temperatures. Two different solutions are proposed: both designs refer to a screen realised as a thin cylindrical shell with external and internal sides acting as “active” surfaces, where heat flux and temperature can be imposed. A proposal of module subdivision and of channel layout is presented, with two solutions that differ, from each other, from the point of view of the cold side fluid (single phase or two-phase evaporating fluid). Pressure drops and heat transfer coefficients are estimated for a wide range of geometrical and physical parameter values.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/201863
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