Performance studies of the CMS strip tracker before installation

Peer reviewe

CMS physics technical design report : Addendum on high density QCD with heavy ions

Peer reviewe

The ALICE experiment at the CERN LHC

ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the CERN LHC which focuses on QCD, the strong-interaction sector of the Standard Model. It is designed to address the physics of strongly interacting matter and the quark-gluon plasma at extreme values of energy density and temperature in nucleus-nucleus collisions. Besides running with Pb ions, the physics programme includes collisions with lighter ions, lower energy running and dedicated proton-nucleus runs. ALICE will also take data with proton beams at the top LHC energy to collect reference data for the heavy-ion programme and to address several QCD topics for which ALICE is complementary to the other LHC detectors. The ALICE detector has been built by a collaboration including currently over 1000 physicists and engineers from 105 Institutes in 30 countries. Its overall dimensions are 161626 m3 with a total weight of approximately 10 000 t. The experiment consists of 18 different detector systems each with its own specific technology choice and design constraints, driven both by the physics requirements and the experimental conditions expected at LHC. The most stringent design constraint is to cope with the extreme particle multiplicity anticipated in central Pb-Pb collisions. The different subsystems were optimized to provide high-momentum resolution as well as excellent Particle Identification (PID) over a broad range in momentum, up to the highest multiplicities predicted for LHC. This will allow for comprehensive studies of hadrons, electrons, muons, and photons produced in the collision of heavy nuclei. Most detector systems are scheduled to be installed and ready for data taking by mid-2008 when the LHC is scheduled to start operation, with the exception of parts of the Photon Spectrometer (PHOS), Transition Radiation Detector (TRD) and Electro Magnetic Calorimeter (EMCal). These detectors will be completed for the high-luminosity ion run expected in 2010. This paper describes in detail the detector components as installed for the first data taking in the summer of 2008

The Trigger of the Tofus Detector

The TOFUS detector is a low energy neutron detector based on double scattering and dedicated to Cold Fusion experiments. We have designed, built and tested special logic circuits allowing a fast decision in a time less than 200 ns, and able to reduce the background signal to 0.035 trigger/sec. Then a software analysis reduces this number to 0.007 events/sec in the (2 divided-by 3) MeV neutron energy range

The Trigger Supervisor of the NA48 experiment at CERN SPS

The NA48 experiment aims to measure direct CP violation in the K# # decays system with an accuracy of 2#10##. High performances are required to the trigger and acquisition systems. This paper describes the NA48 Trigger Supervisor, a 40 MHz pipelined hardware system which correlates and processes trigger informations from local trigger sources, searching for interesting patterns. The trigger packet include a timestamp information used by the readout systems to retrieve detector data. The design architecture and functionality during 98 data taking are described. # 2000 Elsevier Science B.V. All rights reserved. Keywords: Trigger; Pipeline; High-energy physics; Data acquisition; NA48 1. Introduction The NA48 experiment at the CERN SPS is a high precision experiment, searching for direct CP violation in the neutral kaon system through the measurement of Re(##/#)"1! 1 6 R "1! 1 6 K # P#### K # P#### K # P#### K # P#### with an accuracy of 2#10## [1,2]. To achieve the..