IPAC2013 - List of Keywords (multipactoring)

Paper	Title	Other Keywords	Page
TUPEA087	Experiment on Multipactor Suppression in Dielectric-loaded Accelerating Structures with a Solenoid Field	solenoid, electron, simulation, plasma	1319
	C.-J. Jing, S.P. Antipov, A. Kanareykin, P. Schoessow Euclid TechLabs, LLC, Solon, Ohio, USA C. Chang, L. Ge, L. Xiao SLAC, Menlo Park, California, USA M.E. Conde, W. Gai, R. Konecny, J.G. Power ANL, Argonne, USA S.H. Gold NRL, Washington, DC, USA
	Funding: US DoE SBIR Phase I project under contract #DE-SC0007629 Efforts by numerous institutions have been ongoing over the past decade to develop a Dielectric-Loaded Accelerating (DLA) structure capable of supporting high gradient acceleration when driven by an external rf source. Multipactor is the major issue limiting the gradient that was revealed in earlier experiments. A theoretical model predicts that the strength of solenoid field within an optimal range applied to DLA structures may completely block the multipactor. To demonstrate this approach, two DLA test structures have been built and the first high power test will be conducted in December 2012. The results will be reported.

WEPWO039	Prototyping of TEM-like Mode Resonators in the RAON	cavity, niobium, electron, simulation	2384
	H.C. Jung, M.O. Hyun, D. Jeon, H.J. Kim IBS, Daejeon, Republic of Korea
	Preliminary electric-magnetic designs of TEM-like mode resonators(a quarter wave resonator, a half wave resonator, two single spoke resonators) are accomplished for the superconducting linear accelerator in the RAON. Resonant cavities are numerically optimized using a CST MWS code to obtain higher E-field gradient along the beam line in conditions of the peak E-field and B-field is less than 30MV/m, 60mT respectively. Prototyping test of a quater wave resonator of optimum beta 0.047 using OFC(Oxygen Free Cupper)is in progress to analyze resonant frequency shifting by tolerances in fabrication process and external perturbations. It is compared with expected one using compuational codes.

WEPWO067	Conditions for the Existence of 1- and 2-point Multipactor in SRF Cavities	cavity, electron, simulation, superconductivity	2456
	V.D. Shemelin CLASSE, Ithaca, New York, USA
	Funding: NSF award DMR-0807731 One- and two-point multipactor (MP) in RF cavities are well-known phenomena. However, conditions when this or the other type of discharge develops were not clearly defined up to now. Here, an explicit description of these two types of the MP is presented, geometrical parameters, or figures of merit, responsible for initiation of the MP defined, and areas of their existence delineated. Small sizes of trajectories in the MP require a very precise calculation of fields for simulations. On the other hand, due to these small sizes, fields can be presented as the Taylor expansions and trajectories can be found solving ordinary differential equations of motion. Conditions of motion stability and influence of the Miller force are also accounted.

Paper

Title

Other Keywords

Page

TUPEA087

Experiment on Multipactor Suppression in Dielectric-loaded Accelerating Structures with a Solenoid Field

solenoid, electron, simulation, plasma

1319

C.-J. Jing, S.P. Antipov, A. Kanareykin, P. Schoessow
Euclid TechLabs, LLC, Solon, Ohio, USA
C. Chang, L. Ge, L. Xiao
SLAC, Menlo Park, California, USA
M.E. Conde, W. Gai, R. Konecny, J.G. Power
ANL, Argonne, USA
S.H. Gold
NRL, Washington, DC, USA

Funding: US DoE SBIR Phase I project under contract #DE-SC0007629
Efforts by numerous institutions have been ongoing over the past decade to develop a Dielectric-Loaded Accelerating (DLA) structure capable of supporting high gradient acceleration when driven by an external rf source. Multipactor is the major issue limiting the gradient that was revealed in earlier experiments. A theoretical model predicts that the strength of solenoid field within an optimal range applied to DLA structures may completely block the multipactor. To demonstrate this approach, two DLA test structures have been built and the first high power test will be conducted in December 2012. The results will be reported.

WEPWO039

Prototyping of TEM-like Mode Resonators in the RAON

cavity, niobium, electron, simulation

2384

H.C. Jung, M.O. Hyun, D. Jeon, H.J. Kim
IBS, Daejeon, Republic of Korea

Preliminary electric-magnetic designs of TEM-like mode resonators(a quarter wave resonator, a half wave resonator, two single spoke resonators) are accomplished for the superconducting linear accelerator in the RAON. Resonant cavities are numerically optimized using a CST MWS code to obtain higher E-field gradient along the beam line in conditions of the peak E-field and B-field is less than 30MV/m, 60mT respectively. Prototyping test of a quater wave resonator of optimum beta 0.047 using OFC(Oxygen Free Cupper)is in progress to analyze resonant frequency shifting by tolerances in fabrication process and external perturbations. It is compared with expected one using compuational codes.

WEPWO067

Conditions for the Existence of 1- and 2-point Multipactor in SRF Cavities

cavity, electron, simulation, superconductivity

2456

V.D. Shemelin
CLASSE, Ithaca, New York, USA

Funding: NSF award DMR-0807731
One- and two-point multipactor (MP) in RF cavities are well-known phenomena. However, conditions when this or the other type of discharge develops were not clearly defined up to now. Here, an explicit description of these two types of the MP is presented, geometrical parameters, or figures of merit, responsible for initiation of the MP defined, and areas of their existence delineated. Small sizes of trajectories in the MP require a very precise calculation of fields for simulations. On the other hand, due to these small sizes, fields can be presented as the Taylor expansions and trajectories can be found solving ordinary differential equations of motion. Conditions of motion stability and influence of the Miller force are also accounted.