ICAP2012 - List of Authors (Adelmann, A.)

Paper

Title

Page

A Massively Parallel General Purpose Multi-objective Optimization Framework, Applied to Beam Dynamic Studies

62

Y. Ineichen, A. Adelmann
PSI, Villigen, Switzerland
P. Arbenz
ETH, Zurich, Switzerland
C. Bekas, A. Curioni
IBM Research - Zurich, Rueschlikon, Switzerland

Particle accelerators are invaluable tools for research in basic and applied sciences. The successful design, commissioning, and operation of accelerator facilities is non trivial. We implemented a framework for general simulation-based multi-optimization methods automating the investigation of optimal sets of machine parameters. In order to solve the emerging, huge problems we propose a massively-parallel master/slave approach. We employ the framework to identify optimal parameters of existing and new accelerators at PSI.

Slides TUAAI2 [0.694 MB]

THAAI1

The Dark Current and Multipacting Capabilities in OPAL: Model, Benchmarks and Applications

201

C. Wang, Z.G. Yin, T.J. Zhang
CIAE, Beijing, People's Republic of China
A. Adelmann
PSI, Villigen, Switzerland

Dark current and multiple electron impacts (multipacting), as for example observed in radio frequency (RF) structures of accelerators, are usually harmful to the equipment and the beam quality. These effects need to be suppressed to guarantee stable operation. Large scale simulations can be used to understand the cause and develop strategies to suppress these phenomena. We extend OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines, with the necessary physics models to efficiently and precise simulate multipacting phenomenas. We added a Fowler-Nordheim field emission model, two secondary electron emission models, developed by Furman-Pivi and Vaughan respectively, as well as efficient 3D boundary geometry handling capabilities. The models and their implementation are carefully benchmark against a non-stationary multipacting theory for the classic parallel plate geometry. A dedicated, parallel plate experiment shows excellent agreement between theory, model/simulations and experiment.

Slides THAAI1 [6.191 MB]

Paper	Title	Page
TUAAI2	A Massively Parallel General Purpose Multi-objective Optimization Framework, Applied to Beam Dynamic Studies	62
	Y. Ineichen, A. Adelmann PSI, Villigen, Switzerland P. Arbenz ETH, Zurich, Switzerland C. Bekas, A. Curioni IBM Research - Zurich, Rueschlikon, Switzerland
	Particle accelerators are invaluable tools for research in basic and applied sciences. The successful design, commissioning, and operation of accelerator facilities is non trivial. We implemented a framework for general simulation-based multi-optimization methods automating the investigation of optimal sets of machine parameters. In order to solve the emerging, huge problems we propose a massively-parallel master/slave approach. We employ the framework to identify optimal parameters of existing and new accelerators at PSI.
	Slides TUAAI2 [0.694 MB]

THAAI1	The Dark Current and Multipacting Capabilities in OPAL: Model, Benchmarks and Applications	201
	C. Wang, Z.G. Yin, T.J. Zhang CIAE, Beijing, People's Republic of China A. Adelmann PSI, Villigen, Switzerland
	Dark current and multiple electron impacts (multipacting), as for example observed in radio frequency (RF) structures of accelerators, are usually harmful to the equipment and the beam quality. These effects need to be suppressed to guarantee stable operation. Large scale simulations can be used to understand the cause and develop strategies to suppress these phenomena. We extend OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines, with the necessary physics models to efficiently and precise simulate multipacting phenomenas. We added a Fowler-Nordheim field emission model, two secondary electron emission models, developed by Furman-Pivi and Vaughan respectively, as well as efficient 3D boundary geometry handling capabilities. The models and their implementation are carefully benchmark against a non-stationary multipacting theory for the classic parallel plate geometry. A dedicated, parallel plate experiment shows excellent agreement between theory, model/simulations and experiment.
	Slides THAAI1 [6.191 MB]