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The Fast Beam Condition Monitor (BCM1F) is used in CMS to measure beam induced background and precision luminosity. The system in its current implementation was first installed in 2014, equipped with single-crystalline (sCVD) diamond sensors. After some radiation damage, erratic occurrence of HV instabilities required lowering of the operational HV and the system became inefficient, resulting in unstable measurements. The system was replaced in 2017 with poly-crystalline (pCVD) diamond sensors and silicon (Si) sensors. Both new sensor types show significantly better operational stability. The luminosity performance of pCVD and Si based luminosity measurement is discussed.

This work presents the results of experimental investigation into the performance of two basic types of photovoltaic modules exposed outdoors under climatic condition in Bahrain. Measurements of I-V characteristics, open circuit voltage, short circuit current, the efficiency, the fill factor, effect of dust deposition and the effect of climate were made. The results show that the degradation in efficiency of polycrystal modules is more than that of mono crystalline modules.