| 1. |
- Almehed, Sverker, et al.
(författare)
-
Regional research exploitation of the LHC: A case-study of the required computing resources
- 2002
-
Ingår i: Computer Physics Communications. - 0010-4655. ; 145:3, s. 341-350
-
Tidskriftsartikel (refereegranskat)abstract
- A simulation study to evaluate the required computing resources for a research exploitation of the Large Hadron Collider (LHC) has been performed. The evaluation,vas done as a case study. assuming existence of a Nordic regional centre and using the requirements for per-forming a specific physics analysis as a yard-stick. Other input parameters were: assumption for the distribution of researchers at the institutions involved, an analysis model, and two different functional structures of the computing resources.
|
|
| 2. |
- Bertini, Marc, et al.
(författare)
-
PYTHIA version 7-0.0 - a proof-of-concept version
- 2001
-
Ingår i: Computer Physics Communications. - 0010-4655. ; 134:3, s. 365-391
-
Tidskriftsartikel (refereegranskat)abstract
- This document describes the first proof-of-concept version of the PYTHIA7 program. PYTHIA7 is a complete re-write of the PYTHIA program in C++. It is mainly intended to be a replacement for the `Lund' family of event generators, but is also a framework with a structure suitable for implementing any event generator model. In this document, the structure of the program is presented both from the user and the developer point of view. It is not intended to be a complete manual, but together with the documentation provided in the distribution, it should be sufficient to start working with the program.
|
|
| 3. |
- Jung, Hannes
(författare)
-
The CCFM Monte Carlo generator CASCADE
- 2002
-
Ingår i: Computer Physics Communications. - 0010-4655. ; 143:1, s. 100-111
-
Tidskriftsartikel (refereegranskat)abstract
- CASCADE is a full hadron level Monte Carlo event generator for ep, gammap and p (p) over bar processes, which uses the CCFM evolution equation for the initial state cascade in a backward evolution approach supplemented with off-shell matrix elements for die hard scattering. A detailed program description is given, with emphasis on parameters the user wants to change and common block variables which completely specify the generated events.
|
|
| 4. |
- Krogh, Jesper Wisborg, et al.
(författare)
-
The condensation energy of the homogeneous superconducting gas.
- 2003
-
Ingår i: Computer Physics Communications. - 0010-4655. ; 150:1, s. 53-63
-
Tidskriftsartikel (refereegranskat)abstract
- We present CHS, a computer program designed to calculate the condensation energy of the homogeneous superconducting electron gas. The correlation energy, which we treat at the level of the RPA, is an essential ingredient for the construction of a local density approximation in the framework of density functional theory for superconductors (SCDFT) [Kurth et al., Phys. Rev. Lett. 83 (1999) 2628].
|
|
| 5. |
- Sjöstrand, Torbjörn, et al.
(författare)
-
High-energy-physics event generation with PYTHIA 6.1
- 2001
-
Ingår i: Computer Physics Communications. - 0010-4655. ; 135:2, s. 238-259
-
Tidskriftsartikel (refereegranskat)abstract
- Pythia version 6 represents a merger of the Pythia 5, Jetset 7 and SPythia programs, with many improvements. It can be used to generate high-energy-physics 'events', i.e. sets of outgoing particles produced in the interactions between two incoming particles. The objective is to provide as accurate as possible a representation of event properties in a wide range of reactions. The underlying physics is not understood well enough to give an exact description; the programs therefore contain a combination of analytical results and various models. The emphasis in this article is on new aspects, but a few words of general introduction are included. Further documentation is available on the web.
|
|
| 6. |
- Edvardsson, Sverker, et al.
(författare)
-
An atomic program for energy levels of equivalent electrons: lanthanides and actinides
- 2001
-
Ingår i: Computer Physics Communications. - 0010-4655 .- 1879-2944. ; 133:2/3, s. 396-406
-
Tidskriftsartikel (refereegranskat)abstract
- A program written in C is presented to carry out brute force calculations in order to derive energy levels for an equivalent electronic configuration. Relativistic effects are partly neglected except for the spin-orbit interaction. Since the main relativistic effects are indirect, i.e. causing a contraction of the core which in turn causes the outer shells to expand, they are included to a high degree through the use of appropriate Slater integrals. The program is especially useful for primarily unfilled f-shells of the rare-earth or actinide ions. Modifications of the program to include spin−spin, spin−other orbit, Breit interaction etc. is straight forward. The program is also general in the sense that there is no need to find out or generate any Racah coefficients of fractional parentage. The complete energy matrix is diagonalized with all operators interacting simultaneously thus allowing mixing of all quantum numbers. This result in all energy eigenvalues and eigenvectors that in turn for example are partly responsible for the polarized dipole, quadrupole, … transitions within the unfilled shell. Free ion configuration interaction is accounted for through the use of standard CI operators. The Stark splitting can be studied via the standard crystal field Hamiltonian. Magnetic field influence on the energy levels may also be studied.
|
|
| 7. |
- Ishio, H., et al.
(författare)
-
Wave function statistics for mesoscopic transport through chaotic open billiards : Time reversibility, space reciprocity breaking and statistical crossover
- 2001
-
Ingår i: Computer Physics Communications. - 0010-4655 .- 1879-2944. ; 142:1-3, s. 64-70
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We investigate the probability distributions and spatial correlations of the local densities of electron wave functions for ballistic transport through mesoscopic chaotic open billiards. By quantitative comparison between our accurate fully-quantal calculations with theoretical expressions, we find wave-statistical behaviors intrinsically different from those in closed systems. It is shown that chaotic-scattering wave functions in open systems can be universally interpreted in terms of statistically independent real and imaginary random fields together with breaking of the endowed space reciprocity, resulting in the same wave function statistics as in the time-reversal symmetry-breaking crossover regime in closed systems. © 2001 Elsevier Science B.V. All rights reserved.
|
|
| 8. |
- Jaun, André, et al.
(författare)
-
Iterative solution of global electromagnetic wavefields with finite elements
- 2001
-
Ingår i: Computer Physics Communications. - 0010-4655 .- 1879-2944. ; 135:1, s. 74-81
-
Tidskriftsartikel (refereegranskat)abstract
- The time-independent Maxwell equations are solved iteratively in 2D geometry fur 3D global waves in plasma physics. Krylov space methods, such as the generalized- or the quasi-minimal residuals (GMRES or QMR), are applied together with an incomplete factorization (ILU) preconditioning to a formulation using nodal elements for the electromagnetic scalar and vector potentials. The plasma response is represented as a complex, frequency dependent, dielectric tensor operator and can be used for a variety of applications involving low frequency waves in a tokamak. The iterative approach does not only result in considerable memory savings, but it is also more efficient than a direct solution and paves the way for the parallelization of global wave and stability codes.
|
|
| 9. |
- Jönsson, Per, et al.
(författare)
-
A program for computing weak and intermediate field Zemman splittings from MCHF wave functions
- 2002
-
Ingår i: Computer Physics Communications. - : Elsevier. - 0010-4655 .- 1879-2944. ; 144:2, s. 188-199
-
Tidskriftsartikel (refereegranskat)abstract
- Given electronic wave functions generated by the MCHF_CI program (LSJ format), this program calculates diagonal Landé g factors that determine separations of magnetic sublevels in weak external magnetic fields. In addition the program computes off-diagonal Landé g factors and constructs the total interaction matrix for an atom in a magnetic field. By diagonalizing the interaction matrix and plotting the eigenvalues as functions of the magnetic field, Zeeman structures beyond the weak field limit are obtained.
|
|
| 10. |
- Levitina, Tatiana, et al.
(författare)
-
On the Schrödinger equation in ellipsoidal coordinates
- 2000
-
Ingår i: Computer Physics Communications. - : Elsevier. - 0010-4655 .- 1879-2944. ; 126:1-2, s. 107-113
-
Tidskriftsartikel (refereegranskat)abstract
- Quantum scattering by a potential separable in ellipsoidal coordinates is investigated. If the potential vanishes at infinity fast enough, its scattering data – S-matrix, far field amplitude, and total cross-section – are expanded in perturbed Lamé wave functions.
|
|
