7,022 Works

Benchmark of ACCSIM-ORBIT codes for space charge and electron-lens compensation

Aiba Masamitsu
Numerical simulation is a possible approach to evaluate and to understand space charge effects in the CERN injector chain for the LHC. Several codes to simulate space charge effects have been developed, and we performed a benchmark of ACCSIM [1] and ORBIT [2] in this study. The study is highly motivated since beam losses and/or deteriorations in beam quality due to space charge effects are not negligible or sometimes considerable in the complex, especially in...

Benchmarking electron-cloud simulations and pressure measurements at the LHC

F Zimmermann & O Dominguez
During the beam commissioning of the Large Hadron Collider (LHC) with 150, 75, 50 and 25-ns bunch spacing, important electron-cloud effects, like pressure rise, cryogenic heat load, beam instabilities or emittance growth, were observed. A method has been developed to infer different key beam-pipe surface parameters by benchmarking simulations and pressure rise observed in the machine. This method allows us to monitor the scrubbing process (i.e. the reduction of the secondary emission yield as a...

ATLAS Data Challenge Production on Grid3

E May, G Gieraltowski, M Sosebee, N Ozturk, R Baker, K De, X Zhao, Y Smirnov, W Deng, P McGuigan, A Vaniachine, M Mambelli, H Severini, R Gardner & P Nevski

n-XYTER: A CMOS read-out ASIC for a new generation of high rate multichannel counting mode neutron detectors

B Gebauer, K Solvag, H K Soltveit, T Fiutowski, Ulrich Trunk, W Dabrowski, S Buzzetti, A S Brogna, R Szczygiel, M Klein, C J Schmidt & P Wiacek
For a new generation of 2-D neutron detectors developed in the framework of the EU NMI3 project DETNI [1], the 128-channel frontend chip n-XYTER has been designed. To facilitate the reconstruction of single neutron incidence points, the chip has to provide a spatial coordinate (represented by the channel number), as well as time stamp and amplitude information to match the data of x- and y-coordinates. While the random nature of the input signals calls for...

"FASTBUS" - a description, a status report, and a summary of ongoing projects

E J Barsotti
FASTBUS is a modular data and control bus and mechanical packaging standard currently under development. It is being designed to meet the high-speed data acquisition and parallel and distributed processing requirements of the next generation of large-scale physics experiments. It is a multiprocessor system with multiple bus segments which operate independently but link together for passing data. It operates asynchronously to accommodate very high and very low speed devices over long and short paths, using...

Introduction to Transverse Beam Dynamics

B J Holzer
In this chapter we give an introduction to the transverse dynamics of the particles in a synchrotron or storage ring. The emphasis is more on qualitative understanding rather than on mathematical correctness, and a number of simulations are used to demonstrate the physical behaviour of the particles. Starting from the basic principles of how to design the geometry of the ring, we review the transverse motion of the particles, motivate the equation of motion, and...

Cryogenics (high-energy physics applications)

M Firth
The paper reviews some physical properties of materials at low temperatures and the general techniques which are used to produce and maintain temperatures in the liquid-hydrogen and liquid-helium region. Applications of low-temperature technology encountered in high-energy physics are described, with particular reference to refrigeration, hydrogen and polarized targets, liquid hydrogen bubble chambers, superconducting devices and condensation cryopumping. (0 refs).

The Trigger Menu Handler of the ATLAS Level-1 Central Trigger Processor

G A Schuler, Philippe Farthouat, Nick Ellis & R Spiwoks
The role of the Central Trigger Processor (CTP) in the ATLAS Level-1 trigger is to combine information from the calorimeter and muon trigger processors, as well as from other sources, e.g. calibration triggers, and to make the final Level-1 decision. The information sent to the CTP consists of multiplicity values for a variety of pT thresholds, and of flags for ET thresholds. The algorithm used by the CTP to combine the different trigger inputs allows...

The Manufacture of the CMS Tracker Front-End Driver

G Hall, M Noy, J Salisbury, G Iles, J A Coughlan, E J Freeman, I Church, I Reid, C Foudas, R N J Halsall, J Leaver, W J F Gannon, O Zorba, C P Day, M Raymond, J Fulcher, R J Bainbridge, E Corrin, M R Pearson, S Taghavi, I R Tomalin, D H Ballard & G Rogers

Beam-beam interactions

Werner Herr
One of the most severe limitations in high intensity particle colliders is the beam-beam interaction, i.e. the perturbation of the beams as they cross the opposing beam. This introduction to beam-beam effects concentrates on a description of the phenomena that are present in modern colliding beams facilities.

Installing and Operating a Grid Infrastructure at DESY.

A Campbell, M De Riese, V Gulzow, M Ernst, M Vorobiev, B Lewendel, K Wrona, F Brasolin, J Ferrando, A Gellrich, C Wissing, R Mankel, U Ensslin, S Padhi & P Fuhrmann

Registration Year

  • 2014

Data Centers

  • CERN Publishing