The NA62 Large Angle Veto database

The NA62 experiment at CERN will study the very rare decay, K
⁺
π
<sup>+

νν</sup>
bar. To reject the K
⁺
π
⁺
π
^o
background, the detector must be hermetic to photons with a single-photon inefficiency of 10
⁻⁵
for energies above 1 GeV. Three detectors will cover the experiment acceptance: the Liquid Krypton calorimeter from the NA48 experiment, the Large Angle Veto (LAV), and the Small Angle Calorimeter (SAC). The LAV is composed of 12 ring-shaped veto stations positioned along the NA62 vacuum decay tank. Each ring consists of 160 to 256 lead glass blocks, for a total of nearly 2500 blocks, each weighing ∼22 Kg. The construction of the LAV rings started in 2009 and is still ongoing. During the assembly process, each block undergoes a preparation phase which includes the measurement of all properties related to the block's light yield and to the read-out electronics. To regulate and monitor the entire assembly line, we have developed a MySQL-based DB system where all data produced during the assembly process are stored. A web-based user interface offers several functions such as input of block-related data, monitoring of the assembly status of each block, verification of the measurement process, and visualization of the overall status of the LAV production. Data stored in the DB are used both during the assembly process and to configure the LAV DAQ system. This paper will describe the criteria used to create this DB and will provide details about its technical implementation.