Abstract
The ARCADE Raman lidar has been tested and validated at L'Aquila before the deployment at CTA (Cherenkov Telescope Array) North site. Some modifications have been done on the original ARCADE system to improve its performances, and an extensive programme of measurements has been performed. The Raman lidar (RL) technique is discussed with specific care to the technical constrains of RL systems, and the signal analysis, i.e., the estimation of aerosol optical depth, volume backscatter coefficient, and water vapour profiles and their significance (errors and resolution). Some final comments and conclusions are outlined.
Highlights
The development of the Extensive Air Showers (EAS) generated by gamma primaries is greatly influenced by the atmosphere
The variable atmospheric properties affect the observations of the EAS Cherenkov light in multiple ways being responsible at the same time for the production of the Cherenkov light and for its attenuation and propagation when it travels towards the telescopes
We briefly describe the ARCADE system details and performances as results of extensive tests made in L’Aquila
Summary
The development of the Extensive Air Showers (EAS) generated by gamma primaries is greatly influenced by the atmosphere. The variable atmospheric properties affect the observations of the EAS Cherenkov light in multiple ways being responsible at the same time for the production of the Cherenkov light and for its attenuation and propagation when it travels towards the telescopes. The production of Cherenkov light depends on the molecular profile, while the aerosol profile affects its attenuation and propagation; for the details of the propagations, the water vapour profile can be a useful information [1]. The ARCADE RL is able to provide information about the aerosol properties on site at 355 nm as well as water vapour profiles. This lidar can be used for the calibration of other instruments that are expected to operate in the future at the CTA site [2]. We briefly describe the ARCADE system details and performances as results of extensive tests made in L’Aquila
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