Abstract
The NA62 experiment [1] at the CERN SPS (Super Proton Synchrotron) accelerator studies the ultra-rare decays of charged kaons. The high-resolution Liquid Krypton (LKr) electromagnetic calorimeter of the former NA48 experiment [2] is a key component of the experiment photon-veto system. The new LKr readout system comprises 14,000 14-bit ADC acquisition channels, 432× 1 Gbit Ethernet data request and readout links routed by 28× 10 Gbit network switches to the experiment computer farm, and timing, trigger and control (TTC) distribution system. This paper presents the architecture of the LKr readout and TTC systems, the overall performance and the first successfully collected experiment physics data.
Highlights
Liquid Krypton (LKr) calorimeter and its readout electronics2.1 Calorimeter The LKr calorimeter is a quasi-homogeneous electromagnetic calorimeter which ensures a very good intrinsic energy resolution
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The high-resolution Liquid Krypton (LKr) electromagnetic calorimeter of the former NA48 experiment [2] is a key component of the experiment photon-veto system
Summary
2.1 Calorimeter The LKr calorimeter is a quasi-homogeneous electromagnetic calorimeter which ensures a very good intrinsic energy resolution. In addition to the data processing and readout, the LKr digitised signals from the selected channels are summed to build super-cells and delivered to the experiment trigger system. The LKr-specific TTC-LKr interface receives all timing signals via the optical distribution network It converts, decodes and delivers these signals to the calorimeter data acquisition electronics. The main function of the TTC-LKr [12] is to provide 40 MHz clock, L0 trigger information, broadcasts and individually-addresses control signals for CREAM digitisers. The source of these signals can be selected from either the optical 160 Mbps BPM encoded bit-stream input, electrical front-panel inputs or an internal signal generator. The layout of the LKr TTC distribution and the modules picture are presented in figure 4
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