CLOUD collaboration ramps up activities preparing for a new physics run. 

Continuous improvements to the CLOUD facility as well as to the instruments combined with the state of the art know-how available at CERN have enabled a steady increase in the measurement capabilities. 

​Jasper Kirkby, CLOUD spokesperson, gives an overview of the CLOUD experiment after four years operation at the CERN PS. 

A new experiment, known as CLOUD¹, began operation at the CERN PS in November 2009 [CERN Bulletin (2009)]. The CLOUD collaboration comprises 17 institutes from Europe, Russia and the United States, and brings together a diverse interdisciplinary team of atmospheric physicists and chemists, and space, cosmic ray and particle physicists [CLOUD Collaboration].