Research Papers: Experimental Techniques

Thermal Conductance of a Multilayer Drift Chamber: An Experimental Approach

[+] Author and Article Information
Manuel Daniel-Leal

 CIEMAT, Avenida Complutense 22, 28040 Madrid, Spainmanuel.daniel@ciemat.es

Luciano Romero-Barajas

 CIEMAT, Avenida Complutense 22, 28040 Madrid, Spainluciano.romero@ciemat.es

Jose L. Perez-Diaz1

Departamento Ingenieria Mecanica, Universidad Carlos III, Avenida Universidad 30, 28911 Leganes, Spain


Corresponding author.

J. Heat Transfer 132(8), 081602 (Jun 04, 2010) (6 pages) doi:10.1115/1.4001103 History: Received September 14, 2009; Revised December 27, 2009; Published June 04, 2010; Online June 04, 2010

Drift chambers in the compact muon solenoid (CMS) detector are piled modular structures joined together by a structural adhesive. This structure is used for the detection and tracking of high energy particles—particularly muons. According to Fourier’s law, the conductance of a multilayered drift chamber prototype can be measured using a simple device based on the thermal transience between two heat sinks. The heat gradients in the global CMS detector in operation at the European Council for Nuclear Research are estimated in this way. The resultant values are used to determine whether to include a forced cooling device in the CMS.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Sector distribution in the drift chambers in CMS

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Figure 2

MB2 type drift chamber mounted in CMS

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Figure 3

Cross section of a multilayer. The plates and the beams are the boundaries of the drift cells, which are full of air.

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Figure 4

Front end electronics instrumentation

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Figure 5

Modules of the prototype

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Figure 6

Location of the sensors in the reservoirs

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Figure 8

Assembled experimental device

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Figure 9

Schematic diagram showing the heat flow

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Figure 10

Cross section of the prototype in the experimental device

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Figure 11

Device for measuring the conductance of the thermal reservoirs

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Figure 12

ln(T1−T2) and ln(T1+T2) versus time in the calibration with the reservoirs

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Figure 13

Scheme of the system when measuring the conductance of a module

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Figure 14

Temperature jump versus time for a module with isolating strips between the aluminum beams and the plates, for a module without isolating strips and for a module with a honeycomb spacer

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Figure 15

Front view of the CMS detector

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Figure 16

Scheme of the drift chambers arranged in the CMS

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Figure 17

Position of the drift chamber in a cross section of the CMS

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Figure 18

Analog scheme for the heat flows in CMS




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