| Paper |
Title |
Other Keywords |
Page |
| TUPPP14 |
The TileCal DCS Detector Control System
|
controls, monitoring, power-supply, hadron |
118 |
| |
- J. Pina, A. Gomes, C. N. Marques
LIP, Lisboa
- C. Alexa, G. Arabidze
CERN, Geneva
- M. Ouchrif
Université Blaise Pascal, Clermont-Ferrand
- A. Zenin
IHEP Protvino, Protvino, Moscow Region
| |
TileCal is the barrel hadronic calorimeter of the ATLAS detector. The main task of the TileCal Detector Control System (DCS) is to enable the coherent and safe operation of the detector. All actions initiated by the operator and all errors, warnings and alarms concerning the hardware of the detector are handled by DCS. TileCal DCS design is being finalized, prototypes of most of the systems were already produced, and some components were already produced and installed in the detector. The low voltage control system is composed by several components with monitoring and control mostly based on the ATLAS developped ELMB boards. The high voltage system is based on the HV-micro boards developed by TileCal. A DCS system covering a small sector of the TileCal barrel was assembled and is already working in the ATLAS cavern, and by October we expect to have already a full partition equipped with low voltage, high voltage and cooling system.
|
|
|
|
| TUPPP16 |
Integration of a Large-Scale Eigenmode Solver into the ANSYS(c) Workflow Environment
|
resonance, free-electron-laser, electron, cyclotron |
122 |
| |
- B. S.C. Oswald, A. Adelmann, M. Bopp, R. Geus
PSI, Villigen
| |
The numerical computation of eigenfrequencies and eigenmodal fields of large accelerator cavities, based on full-wave, three-dimensional models, has attracted considerable interest in the recent past. In particular, it is of vital interest to know the performance characteristics, such as resonance frequency, quality figures and the modal fields, respectively, of such devices prior to construction; given the fact that the physical fabrication of a cavity is expensive and time-consuming, a device that does not comply with its specifications can not be tolerated; a robust and reliable digital prototyping methodology is therefore essential. Furthermore, modern cavity designs typically exhibit delicate and detailed geometrical features that must be considered for obtaining accurate results. At PSI a three-dimensional finite-element code has been developed to compute eigenvalues and eigenfields of accelerator cavities (*). While this code has been validated versus experimentally measured cavity data, its usage has remained somewhat limited due to missing functionality to connect it to industrial grade modeling software. Such an interface would allow creating advanced CAD geometries, meshing them in ANSYS and eventually exporting and analyzing the design in femaxx. We have therefore developed pre- and postprocessing software which imports meshes generated in ANSYS for a femaxx run. A postprocessing step generates a result file than can be imported into ANSYS and further be analyzed there. Thereby, we have integrated femaXX into the ANSYS workflow such that detailed cavity designs leading to large meshes can be analyzed with femaXX, taking advantage of its capability to address very large eigenvalue problems. Additionally, we have added functionality for parallel visualization to femaxx. We present a practical application of the pre- and postprocessing codes and compare the results against experimental values, where available, and other numerical codes when the model has no
* P. Arbenz, M. Becka, R. Geus, U. L. Hetmaniuk, and T. Mengotti,
"On a Parallel Multilevel Preconditioned Maxwell Eigensolver".
Parallel Computing, 32(2): 157-165 (2006).
|
|
|
|
| WESEPP03 |
High-Order Algorithms for Simulation of Laser Wakefield Accelerators
|
simulation, emittance, electron |
230 |
| |
- D. L. Bruhwiler, J. R. Cary, D. A. Dimitrov, P. Messmer
Tech-X, Boulder, Colorado
- E. Esarey, C. G.R. Geddes
LBNL, Berkeley, California
- E. Kashdan
Brown University, Providence, Rhode Island
| |
Funding: This work is funded by the US DOE Office of Science, Office of High Energy Physics, including use of NERSC.
Electromagnetic particle-in-cell (PIC) simulations of laser wakefield accelerator (LWFA) experiments have shown great success recently, qualitatively capturing many exciting features, like the production of ~1 GeV electron beams with significant charge, moderate energy spread and remarkably small emittance. Such simulations require large clusters or supercomputers for full-scale 3D runs, and all state-of-the art codes are using similar algorithms, with 2nd-order accuracy in space and time. Very high grid resolution and, hence, a very large number of time steps are required to obtain converged results. We present preliminary results from the implementation and testing of 4th-order algorithms, which hold promise for dramatically improving the accuracy of future LWFA simulations.
|
|
|
|
| THM1MP02 |
Parallel Particle-In-Cell (OIC) Codes
|
simulation, electron, diagnostics, emittance |
290 |
| |
- F. Wolfheimer, E. Gjonaj, T. Weiland
TEMF, Darmstadt
| |
Funding: This work has been partially supported by DESY Hamburg.
Particle-In-Cell (PIC) simulations are commonly used in the field of computational accelerator physics for modelling the interaction of electromagnetic fields and charged particle beams in complex accelerator geometries. However, the practicability of the method for real world simulations, is often limited by the huge size of accelerator devices and by the large number of computational particles needed for obtaining accurate simulation results. Thus, the parallelization of the computations becomes necessary to permit the solution of such problems in a reasonable time. Different algorithms allowing for an efficient parallel simulation by preserving an equal distribution of the computational workload on the processes while minimizing the interprocess communication are presented. This includes some already known approaches based on a domain decomposition technique as well as novel schemes. The performance of the algorithms is studied in different computational environments with simulation examples including a full 3D simulation of the PITZ-Injector [*].
*A. Oppelt et al Status and First Results from the Upgraded PITZ Facility, Proc. FEL 2005
|
|
|
Slides
|
|
|
|