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arXiv 1107.0358physics.ins-dethep-ex
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CMS μ子漂移室的漂移速度和压力监测

Drift velocity and pressure monitoring of the CMS muon drift chambers

Lars Sonnenschein

摘要:

CMS μ子室漂移管中的漂移速度是μ子径迹重建和触发的关键参数。需要对其进行精确监测,以检测其与标称值的任何偏差。绝对压强的变化、气体混合物的变化或腔室气体被空气污染都会影响漂移速度。此外,温度和磁场影响其值。第一个数据,采取了专用的速度漂移室(VDC)建成的亚琛工业大学IIIA。另一个需要监测的重要参数是μ子漂移管腔室内部的压力。压差不得超过一定值,并且绝对压强必须保持略高于环境压强,以防止在泄漏的情况下空气进入μ子漂移管室。最新的漂移速度监测结果进行了讨论。

英文摘要:

The drift velocity in drift tubes of the CMS muon chambers is a key parameter for the muon track reconstruction and trigger. It needs to be monitored precisely in order to detect any deviation from its nominal value. A change in absolute pressure, a variation of the gas admixture or a contamination of the chamber gas by air affect the drift velocity. Furthermore, the temperature and magnetic field influence its value. First data, taken with a dedicated Velocity Drift Chamber (VDC) built by RWTH Aachen IIIA are presented. Another important parameter to be monitored is the pressure inside the muon drift tube chambers. The differential pressure must not exceed a certain value and the absolute pressure has to be kept slightly above ambient pressure to prevent air from entering into the muon drift tube chambers in case of a leak. Latest drift velocity monitoring results are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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