Dose rate measurement for a DT spare chamber at GIF++

At the High Luminosity Large Hadron Collider (HL-LHC), the Compact Muon Solenoid (CMS) will need to sustain an integrated dose ten times higher than expected at LHC. Irradiation campaigns have been performed to assess the capability of operating under such conditions and to investigate the aging induced by radiation.

One DT chamber (MB2 DT spare chamber) installed at the Gamma Irradiation Facility (GIF++) at CERN was irradiated with a high activity Cesium 137 source along a period of two years at different source intensity. The longevity studies for this chamber during the irradiation period are presented here. Along this irradiation period, different detectors (CSC chambers) were placed between the source and the DT chamber modifying the distribution and intensity of the dose rate. The characterization of the dose deposited on the chamber has been made using different devices to cross-check the instantaneous and integrated dose: a RADMON sensor with a radiation sensing field effect transistor, a RAMSES detector based on an ionization chamber and a commercial portable Geiger-Müller dosimeter.

List of Plots

Figure Caption
[1] The 2D map shows the dose rate just in front of the MB2 DT chamber installed at GIF++. Other detectors under irradiation were placed between the source and the DT chamber. This produced an inhomogeneous irradiation profile on the detector. In order to study the dose spatial distribution, several measurements were taken using the Automess 6150 AD portable dosimeter, placed on top of an automated mobile platform. The measurements were taken every 2 cm at three different heights (68 cm , 164 cm and 250 cm); the map was built from the interpolation of the three profiles. The plot is represented from the perspective of the chamber facing the source in the Z axis. The lower rate sections shown in purple correspond to two CSC detectors of trapezoidal shape placed between the source and the DT chamber (represented by the black doted line). The region behind the CSC detector had lower dose rate while the top of the detector had the highest, since there were no obstacles between the chamber and the source.

-- BarbaraAlvarezGonzalez - 2019-07-16

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Topic revision: r5 - 2019-07-25 - FrancescaCavallo
 
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