Cyclotrons2013 - List of Authors (Adelmann, A.)

Paper

Title

Page

A Study of Multipacting Effects in Large Cyclotron Cavities by Means of Fully 3-Dimensional Simulations

142

C. Wang, B. Ji, Y. Lei, P.Z. Li, J.S. Xing, Z.G. Yin, T.J. Zhang
CIAE, Beijing, People's Republic of China
A. Adelmann, A. Gsell, M. Seidel
PSI, Villigen PSI, Switzerland

The field emission model and the secondary emission model, as well as 3D boundary geometry handling capabilities, are needed to efficiently and precisely simulate multipacting phenomena. These models have been implemented in OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines. The models and their implementation are carefully benchmarked against a non-stationary multipacting theory. A dedicated multipacting experiment with nanosecond time resolution for the classic parallel plate geometry has also successfully shown the validity of OPAL model. Multipacting phenomena, in the CYCIAE-100 cyclotron, under construction at China Institute of Atomic Energy, are expected to be more severe during the RF conditioning process than in separate-sector cyclotrons. This is because the magnetic fields in the valley are stronger, which may make the impact electrons easier to reach energies that lead to larger multipacting probabilities. We report on simulation results for CYCIAE-100, which gives us an insight view of the multipacting process and help to develop cures to suppress these phenomena.

Slides TU2PB01 [7.012 MB]

WEPPT030

High Intensity Compact Cyclotron for ISODAR Experiment

384

D. Campo, J.R. Alonso, W.A. Barletta, L.M. Bartoszek, A. Calanna, J.M. Conrad, M. Toups
MIT, Cambridge, Massachusetts, USA
A. Adelmann
PSI, Villigen PSI, Switzerland
L. Calabretta, C. Cui, G. Gallo
INFN/LNS, Catania, Italy
R. Gutierrez-Martinez, L.A. Winslow
UCLA, Los Angeles, USA
M. Shaevitz
Columbia University, New York, USA
J.J. Yang
CIAE, Beijing, People's Republic of China

IsoDAR is an experiment proposed to look for the existence of sterile neutrinos. These are additional neutrino states beyond the "standard" 3-nu paradigm, are predicted to exist to explain anomalies in several neutrino experiments. In IsoDAR (Isotope Decay At Rest), electron antineutrinos produced in a target ~15 meters from a kiloton-scale detector would oscillate into and out of the sterile state within the extent of the detector, producing a sinusoidal event rate as a function of distance from the target. The nu-e-bar flux arises from decay of 8Li, produced when a high-current beam of protons or deuterons strikes a beryllium target either directly, or via secondary neutrons that interact in a large, ultra-pure 7Li sleeve surrounding the target. A compact Q/A = 0.5 cyclotron with top energy of 60 MeV/amu will be installed underground close to KamLAND. This cyclotron is a prototype for the DAEδALUS cyclotron chain (Paper WEPPT030). With a central field of 1.075T, it will operate in the 4th harmonic. Preliminary designs will be described, as well as possible solutions for transport and assembly of the machine through the very constricted access apertures of the Kamioka mine.

Paper	Title	Page
TU2PB01	A Study of Multipacting Effects in Large Cyclotron Cavities by Means of Fully 3-Dimensional Simulations	142
	C. Wang, B. Ji, Y. Lei, P.Z. Li, J.S. Xing, Z.G. Yin, T.J. Zhang CIAE, Beijing, People's Republic of China A. Adelmann, A. Gsell, M. Seidel PSI, Villigen PSI, Switzerland
	The field emission model and the secondary emission model, as well as 3D boundary geometry handling capabilities, are needed to efficiently and precisely simulate multipacting phenomena. These models have been implemented in OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines. The models and their implementation are carefully benchmarked against a non-stationary multipacting theory. A dedicated multipacting experiment with nanosecond time resolution for the classic parallel plate geometry has also successfully shown the validity of OPAL model. Multipacting phenomena, in the CYCIAE-100 cyclotron, under construction at China Institute of Atomic Energy, are expected to be more severe during the RF conditioning process than in separate-sector cyclotrons. This is because the magnetic fields in the valley are stronger, which may make the impact electrons easier to reach energies that lead to larger multipacting probabilities. We report on simulation results for CYCIAE-100, which gives us an insight view of the multipacting process and help to develop cures to suppress these phenomena.
	Slides TU2PB01 [7.012 MB]

WEPPT030	High Intensity Compact Cyclotron for ISODAR Experiment	384
	D. Campo, J.R. Alonso, W.A. Barletta, L.M. Bartoszek, A. Calanna, J.M. Conrad, M. Toups MIT, Cambridge, Massachusetts, USA A. Adelmann PSI, Villigen PSI, Switzerland L. Calabretta, C. Cui, G. Gallo INFN/LNS, Catania, Italy R. Gutierrez-Martinez, L.A. Winslow UCLA, Los Angeles, USA M. Shaevitz Columbia University, New York, USA J.J. Yang CIAE, Beijing, People's Republic of China
	IsoDAR is an experiment proposed to look for the existence of sterile neutrinos. These are additional neutrino states beyond the "standard" 3-nu paradigm, are predicted to exist to explain anomalies in several neutrino experiments. In IsoDAR (Isotope Decay At Rest), electron antineutrinos produced in a target ~15 meters from a kiloton-scale detector would oscillate into and out of the sterile state within the extent of the detector, producing a sinusoidal event rate as a function of distance from the target. The nu-e-bar flux arises from decay of 8Li, produced when a high-current beam of protons or deuterons strikes a beryllium target either directly, or via secondary neutrons that interact in a large, ultra-pure 7Li sleeve surrounding the target. A compact Q/A = 0.5 cyclotron with top energy of 60 MeV/amu will be installed underground close to KamLAND. This cyclotron is a prototype for the DAEδALUS cyclotron chain (Paper WEPPT030). With a central field of 1.075T, it will operate in the 4th harmonic. Preliminary designs will be described, as well as possible solutions for transport and assembly of the machine through the very constricted access apertures of the Kamioka mine.