Experimental investigations of the electron cloud key parameters

Motivated by a potential electron cloud instability and the possible existence of electron multipacting in the LHC vacuum system, that may result in additional gas desorption and unmanageable heat loads on the cryogenic system, and extensive experimental research program is underway at CERN to quantify the key parameters driving these phenomena. Parameters, such as: photoelectron yield, photon reflectivity, secondary electron yield etc from industrially prepared surfaces have been quantified. In addition to their dependence on photon dose the effect of temperature and presence of external fields has also been studied. (author)