2011 Particle Accelerator Conference - List of Keywords (collective-effects)

Paper	Title	Other Keywords	Page
MOOBS2	Status of High Intensity Effects in the Spallation Neutron Source Accumulator Ring	space-charge, coupling, injection, resonance	17
	S.M. Cousineau ORNL, Oak Ridge, Tennessee, USA
	Funding: This research is supported by UT-Battelle, LLC for the U. S. Department of Energy under contract No. DE-AC05-00OR22725 The 248-meter Spallation Neutron Source (SNS) accumulator ring has accumulated up to 1.55·10¹⁴, 1 GeV protons. At this intensity, space charge effects contribute significantly to the beam dynamics. Here we present observations of space charge effects in the SNS ring, with emphasis on space charge effects and e-p instabilities.
	Slides MOOBS2 [3.704 MB]

TUP009	A Computational Model for Muons Passing Gas and Plasma Targets: Beam Emittance.	target, scattering, simulation, emittance	823
	A. Samolov, A.L. Godunov ODU, Norfolk, Virginia, USA
	A good understanding of interaction of muon beams with gas targets is crucial for attaining high acceleration gradients in gas pressured RF cavities. This physics includes a number of challenging problems. Our objective has been to develop a computational model for studying the most important effects within the same level of accuracy. The computational model simulates scattering of a bunch of charged particles on multiple atomic, molecular and ionic centers. The interaction potentials have been calculated using Hartree-Fock method for atomic targets, and Molecular Orbital method for molecular targets. Target particles are populated randomly to simulate either a gas in a pressured RF cavity with a particular material density, or liquid hydrogen. In the present work the following effects on beam emittance have been studied: effect of multiple scattering (comparing to single particle tracking models), effect of various degree of target ionization (beam-plasma interaction), space charge screening in plasma, effect of strong magnetic fields. Our preliminary results demonstrate that the degree of plasma ionization has a strong effect of the beam emittance.

WEP164	Accelerating Beam Dynamics Simulations with GPUs	quadrupole, simulation, acceleration, space-charge	1800
	I.V. Pogorelov, K. Amyx, P. Messmer Tech-X, Boulder, Colorado, USA
	Funding: This work is funded by the DOE/BES Grant No. DE-SC0004585, and by Tech-X Corp. We present recent results of prototyping general-purpose particle tracking on GPUs, discussing our CUDA implementation of transfer maps for single-particle dynamics and collective effects. Our goal being incorporation of the GPU-accelerated tracking into ANL's accelerator code ELEGANT, we used the code's quadrupole and drift-with-LSC elements as test cases. We discuss the use of data-parallel and hardware-assisted approaches (segmented scan and atomic updates) for resolving memory contention issues at the charge deposition stage of algorithms for modeling collective effects.

Paper

Title

Other Keywords

Page

MOOBS2

Status of High Intensity Effects in the Spallation Neutron Source Accumulator Ring

space-charge, coupling, injection, resonance

17

S.M. Cousineau
ORNL, Oak Ridge, Tennessee, USA

Funding: This research is supported by UT-Battelle, LLC for the U. S. Department of Energy under contract No. DE-AC05-00OR22725
The 248-meter Spallation Neutron Source (SNS) accumulator ring has accumulated up to 1.55·10¹⁴, 1 GeV protons. At this intensity, space charge effects contribute significantly to the beam dynamics. Here we present observations of space charge effects in the SNS ring, with emphasis on space charge effects and e-p instabilities.

Slides MOOBS2 [3.704 MB]

TUP009

A Computational Model for Muons Passing Gas and Plasma Targets: Beam Emittance.

target, scattering, simulation, emittance

823

A. Samolov, A.L. Godunov
ODU, Norfolk, Virginia, USA

A good understanding of interaction of muon beams with gas targets is crucial for attaining high acceleration gradients in gas pressured RF cavities. This physics includes a number of challenging problems. Our objective has been to develop a computational model for studying the most important effects within the same level of accuracy. The computational model simulates scattering of a bunch of charged particles on multiple atomic, molecular and ionic centers. The interaction potentials have been calculated using Hartree-Fock method for atomic targets, and Molecular Orbital method for molecular targets. Target particles are populated randomly to simulate either a gas in a pressured RF cavity with a particular material density, or liquid hydrogen. In the present work the following effects on beam emittance have been studied: effect of multiple scattering (comparing to single particle tracking models), effect of various degree of target ionization (beam-plasma interaction), space charge screening in plasma, effect of strong magnetic fields. Our preliminary results demonstrate that the degree of plasma ionization has a strong effect of the beam emittance.

WEP164

Accelerating Beam Dynamics Simulations with GPUs

quadrupole, simulation, acceleration, space-charge

1800

I.V. Pogorelov, K. Amyx, P. Messmer
Tech-X, Boulder, Colorado, USA

Funding: This work is funded by the DOE/BES Grant No. DE-SC0004585, and by Tech-X Corp.
We present recent results of prototyping general-purpose particle tracking on GPUs, discussing our CUDA implementation of transfer maps for single-particle dynamics and collective effects. Our goal being incorporation of the GPU-accelerated tracking into ANL's accelerator code ELEGANT, we used the code's quadrupole and drift-with-LSC elements as test cases. We discuss the use of data-parallel and hardware-assisted approaches (segmented scan and atomic updates) for resolving memory contention issues at the charge deposition stage of algorithms for modeling collective effects.