A. Paolozzi

The CMS RPC gas gain monitoring system: An Overview and preliminary results

The status of the Compact Solenoid Spectrometer (CMS) Resistive Plate Counter (RPC) Gas Gain Monitoring (GGM) system developed at the Frascati Laboratory of INFN (Istituto Nazionale di Fisica Nucleare) is reported. The GGM system is a cosmic ray telescope based on small RPC detectors operated with the same gas mixture used by the CMS RPC system. The GGM gain and efficiency are continuously monitored on-line, thus providing a fast and accurate determination of any shift in working point conditions. The construction details and the first result of GGM commissioning are described.

Study of gas purifiers for the CMS RPC detector

Abstract The CMS RPC muon detector utilizes a gas recirculation system called closed loop (CL) to cope with large gas mixture volumes and costs. A systematic study of CL gas purifiers has been carried out over 400 days between July 2008 and August 2009 at CERN in a low-radiation test area, with the use of RPC chambers with currents monitoring, and gas analysis sampling points. The study aimed to fully clarify the presence of pollutants, the chemistry of purifiers used in the CL, and the regeneration procedure. Preliminary results on contaminants release and purifier characterization are reported.

An RPC-based Technical Trigger for the CMS Experiment

In the CMS experiment, sub-detectors may send special trigger signals, called “Technical Triggers”, for purposes like test and calibration. The Resistive Plate Chambers are part of the Muon Trigger System of the experiment, but might also produce a cosmic muon trigger to be used during the commissioning of the detectors, the CMS Magnet Test-Cosmic Challenge and the later running of CMS. The proposed implementation is based on the development of a new board, the RPC Balcony Collector (RBC); the test results on prototypes and their performance during the recent CMS Cosmic Challenge are presented.

Fiber optic sensors for space missions

Fiber optic sensors offer several advantages over conventional ones such as the immunity from electromagnetic interferences and the possibility of multiplexing many of them along the same fiber. Such sensors can be used to monitor local deformations on or inside the structures. In the paper will be mentioned techniques that can be used for embedding those sensors into several types of materials and possible applications in the field of Structural Health Monitoring (SHM). However the main objective is to show applications is in the field of scientific space experiments where precise position monitoring of particle detectors or of optical instrument can be crucial for the success of the mission. A real time position monitoring system based on fiber optic sensors is presented. The experimental results are compared with a conventional optical technique.

Sensitivity and environmental response of the CMS RPC gas gain monitoring system

Results from the gas gain monitoring (GGM) system for the muon detector using RPC in the CMS experiment at the LHC is presented. The system is designed to provide fast and accurate determination of any shift in the working point of the chambers due to gas mixture changes.

A novel approach for an integrated straw tube-microstrip detector

We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell/spl reg/ lattice and carbon fiber reinforced plastic shell. Results on mechanical and test beam performances are reported as well.

Use of fiber Bragg grating sensor for position monitoring in high energy physics experiment BTeV

In this paper, we discuss alignment of tracking detectors in High Energy Physics experiment BTeV and we propose a position monitoring system based on use of Fiber Bragg Grating sensors. The system is intended for monitoring the displacements of high spatial resolution detectors used in High Energy Physics, such as silicon vertex detectors, and it was tested on a scaled down mock-up of a detector currently in planning stage. Results of experimental tests devoted to verify the reliability of the system are presented.

MICROMETRIC POSITION MONITORING USING FIBER BRAGG GRATING SENSORS IN SILICON DETECTORS

We show R&D results including long term stability, resolution, radiation hardness and characterization of Fiber Grating sensors used to monitor structure deformation, repositioning and surveying of silicon detector in High Energy Physics.

TWO- AND THREE-DIMENSIONAL RECONSTRUCTION AND ANALYSIS OF THE STRAW TUBES TOMOGRAPHY IN THE BTEV EXPERIMENT

A check of the eccentricity of the aluminised kapton straw tubes used in the BTeV experiment is accomplished using X-ray tomography of the section of tubes modules. 2 and 3-dimensional images of the single tubes and of the modules are reconstructed and analysed. Preliminary results show that a precision better than 40 � m can be reached on the measurement of the straw radii.

A new configuration for a straw tube microstrip detector

We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell/spl reg/ lattice and carbon fiber reinforced plastic shell.