8,366 Works

Implementation of the Control System for the LHCb Muon Detector

Walter Rinaldi, Valerio Bocci, Francesco Iacoangeli, Giacomo Chiodi, Davide Pinci & Rafael Nobrega
The Muon Detector of LHCb will be equipped with 1368 Multi- Wire Proportional Chambers and 24 Triple-GEM Detectors. Within the Framework of the CERN Control System Project, using PVSS as the main tool, we are developing an instrument to manage the Muon System of LHCb. Adjustment and monitoring of High and Low Voltage power supplies, on-line diagnostics and ne tuning of the Front-End read-out devices, data acquisition from the gas system and the monitoring of...

The ALICE alignement framework

R Grosso
The ALICE alignment framework is described. Based on the ROOT geometry package, it provides the functionality to consistently produce, store, retrieve, and apply the alignment constants.

SPS Impedance

E Shaposhnikova, E Gaxiola, R Calaga, Joachim Tückmantel, H Bukhardt, B Salvant, Friedhelm Caspers, H Damerau, T Bohl, M Schokker, T Kroyer, E Métral, H Medina, B Spataro, Gianluigi Arduini & G Rumolo
For many years several measurements of the beam coupling impedance have been performed each year in both longitudinal and transverse planes of the CERN Super Proton Synchrotron to keep track of the evolution of its hardware. Copious types of equipments had to be modified or added in the past to allow the SPS to produce the nominal LHC beam. The next challenge would be the operation of the SPS with higher intensity for the LHC...

Collective instabilities and collisional effects for a 2D model of a beam in a storage ring

G Turchetti & C Benedetti
We consider a collisional 2D model for a beam in a ring. In the smooth focusing approximation the relaxation time scales according to Landau’s theory, but the p.d.f of momentum jumps has a power law decaying queue. A new hybrid regime is found for the equipartitioning due to the interplay between collisional and collective effects. The moments equations of a small perturbation to the KV distribution are analytically determined and the stability conditions follow from...

The HAL25 Front-end chip for the ALICE Silicon Strip Detectors

A Brogna, D Bonnet, C Gojak, C Hu-Guo, Jean Robert Lutz, J P Coffin, A Tarchini & G Deptuch

Multipacting

Renzo F Parodi
Multipacting (MP) is a resonant electron discharge, often plaguing radiofrequency structures, produced by the synchronization of emitted electrons with the RF fields and by the electron multiplication at the impact point with the surface of the structure. The current of re-emitted electrons grows via true secondary re-emission when the secondary yield for the primary electron impact energy is greater than one. A simple example (MP in short-gap accelerating axial-symmetric cavities) allows an analytical solution of...

Ferrite cavities

H Klingbeil
Ferrite cavities are used in synchrotrons and storage rings if the maximum RF frequency is in the order of a few MHz. We present a simple model for describing ferrite cavities. The most important parameters are defined, and the material properties are discussed. Several practical aspects are summarized, and the GSI SIS18 ferrite cavity is presented as an example.

Conductive Cooling of SDD and SSD Front-End Chips for ALICE

S Coli, A Van Den Brink, F Tosello, S N Igolkin, P Kuijer, F Daudo, A Swichev, G A Feofilov, G Giraudo, O N Godisov & G J L Nooren
We present analysis, technology developments and test results of the heat drain system of the SDD and SSD front-end electronics for the ALICE Inner Tracker System (ITS). Application of super thermoconductive carbon fibre thin plates provides a practical solution for the development of miniature motherboards for the FEE chips situated inside the sensitive ITS volume. Unidirectional carbon fibre motherboards of 160 -300 micron thickness ensure the mounting of the FEE chips and an efficient heat...

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