Abstract
The NA62 experiment [1] at CERN SPS (Super Proton Synchrotron) accelerator aims at studying Kaon decays with high precision. The high resolution Liquid Krypton (LKr) calorimeter, built for the NA48 [2] experiment, is a crucial part of the experiment photon-veto system; to cope with the new requirements, the back-end electronics of the LKr had to be completely renewed.Due to the huge number of the calorimeter readout channels ( ∼ 14 K) and the maintenance requirement over 10 years of the experiment lifetime, the decision to sub-contract the development and production to industry was taken in 2011. This paper presents the primary test results of the Calorimeter REAdout Module (CREAM) [3] prototype delivered by the manufacturer in March 2013. All essential features, analog performance, data processing and readout, are covered.
Highlights
Due to the huge number of the calorimeter readout channels (∼ 14 K) and the maintenance requirement over 10 years of the experiment lifetime, the decision to sub-contract the development and production to industry was taken in 2011
Three trigger levels will be implemented to reduce the 10 MHz Kaon decays in the fiducial region down to the 10 KHz events written on disk, each level reducing the data load by about one order of magnitude
The first trigger level (L0T) is FPGA-based and will use the TEL62 board [7], developed by the NA62 collaboration and based on the TELL1 board [8] used in the LHCb experiment
Summary
NA62 will reuse the quasi-homogeneous LKr calorimeter built for the NA48 experiment (figure 2). The LKr volume is divided into 13248 2 × 2 cm cells by Cu-Be electrodes, which have a pointing geometry and a zig-zag shape to minimise response inhomogeneities when the particle shower is too close to the anode (figure 3). The signal produced by a particle crossing the LKr is collected by preamplifiers mounted inside the cryostat, directly attached to the calorimeter strips, and is sent out using 50 Ω coaxial cables and feedthroughs on the top of the cryostat. The signals are sent to the transceiver boards, plugged directly on the feedthroughs and sharing the Faraday cage made by the cryostat. Each generator produces an exponentially decaying signal that serves 8 channels; its pulse height is set by a 15 bits DAC
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
