The NA48(1) LKr calorimeter readout electronics
IEEE T NUCL SCI 47:2 (2000) 136-141
Abstract:
The NA48 experiment at the CERN SPS accelerator is making a measurement of the direct CP violation parameter epsilon'/epsilon by comparing the four rates of decay of K-S and K-L into 2(pi)(0) and pi(+)pi(-). To reconstruct the decays into 2 pi(0) the information from the almost 13500 channels of a quasi-homogeneous liquid krypton electromagnetic calorimeter is used. The readout electronics of the calorimeter has been designed to provide a dynamic range from a few MeV to about 50 GeV energy deposition per cell, and to sustain a high rate of incident particles. The system is made by cold charge preamplifiers (working at 120 degrees K), low-noise fast shapers followed by digitizer electronics at 40 MHz sampling rate that employs a gain switching technique to expand the dynamic range, where the gain can be selected for each sample individually (i.e. every 25 ns). To reduce the amount of data collected the system contains a zero suppression circuit based on halo expansion.Precision measurement of the Ξ0 mass and the branching ratios of the decays Ξ0 → Λγ and Ξ0 → ∑0γ
European Physical Journal C 12:1 (2000) 69-76
Abstract:
A new precision measurement of the Ξ0 mass has been performed at the NA48 experiment at the CERN SPS. The value obtained is [1314.82±0.06 (stat.) ±0.2 (syst.)] MeV/c2. The branching ratios of Xi;0 radiative decays have been measured as: Br(Ξ0 → Λγ) = [1.90 ± 0.34(stat.) ± 0.19(syst.)] · 10-3 and Br(Ξ0 → ∑0γ) = [3.14 ± 0.76(stat.) ± 0.32(syst.)] · 10-3.The NA481 LKr calorimeter readout electronics
IEEE Transactions on Nuclear Science 47:2 PART 1 (2000) 136-141
Abstract:
The NA48 experiment at the CERN SPS accelerator is making a measurement of the direct CP violation parameter e//£by compari ng the four rates of decay of Kä andKJ. into 2n° and 7i+7iT. To reconstruct the decays into 27C11 the information from the almost 13500 channels of a quasi-homogeneous liquid krypton electromagnetic calorimeter is used. The readout electronics of the calorimeter has been designed to provide a dynamic range from a few MeV to about 50 GeV energy deposition per cell, and to sustain a high rate of incident particles. The system is made by cold charge preamplifiers (working at 120°K), low-noise fast shapers followed by digitizer electronics at 40 MHz sampling rate that employs a gain switching technique to expand the dynamic range, where the gain can be selected for each sample individually (i. e. every 25 ns). To reduce the amount of data collected the system contains a zero suppression circuit based on halo expansion. © 2000 IEEE.Precision measurement of the Ξ0 mass and the branching ratios of the decays Ξ0 → Λγ and Ξ0 → Σ0γ
EUROPEAN PHYSICAL JOURNAL C 12:1 (2000) 69-76
Space charge in ionization detectors and the NA48 electromagnetic calorimeter
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 421:1-2 (1999) 75-89