The NA48(1) LKr calorimeter readout electronics

Citation
A. Gianoli et al., The NA48(1) LKr calorimeter readout electronics, IEEE NUCL S, 47(2), 2000, pp. 136-141
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Nuclear Emgineering
Journal title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
ISSN journal
0018-9499 → ACNP
Volume
47
Issue
2
Year of publication
2000
Part
1
Pages
136 - 141
Database
ISI
SICI code
0018-9499(200004)47:2<136:TNLCRE>2.0.ZU;2-V
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 ra tes of decay of K-S and K-L into 2(pi)(0) and pi(+)pi(-). To reconstruct th e decays into 2 pi(0) the information from the almost 13500 channels of a q uasi-homogeneous liquid krypton electromagnetic calorimeter is used. The re adout 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 su stain a high rate of incident particles. The system is made by cold charge preamplifiers (working at 120 degrees K), low-noise fast shapers followed b y digitizer electronics at 40 MHz sampling rate that employs a gain switchi ng technique to expand the dynamic range, where the gain can be selected fo r 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 exp ansion.