CYCLOTRONS 2010 - List of Keywords (background)

Paper	Title	Other Keywords	Page
MOPCP088	The Simulation on Beam Interaction with Background Particles	target, ion, simulation, ion-source	230
	C.D. Hu, L.Z. Liang, J.L. Wei ASIPP, Hefei, People's Republic of China
	Funding: Supported by the National Nature Science Foundation of China (10875146) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Y05FCQ0128) A particle simulation with Monte Carlo was developed to study beam interaction with background particles in neutral beam injector. The collision processes associated with charge state change and reaction cross-section were analyzed for neutralization and re-ionization. Take the neutralization processes as a reference, for the positive arc discharge ion source, there are three different original ion species in the energetic ion beam. In evolution, a fast particle will suffer kinds of collisions decided by the collision cross-section or no impact within the target gas. Classify those collisions and their cross-sections according the change of charge state and momentum. Discretize the distribution of target gas density along the neutralizer properly. As a result, the neutralizer is divided into many extremely short segments averagely. So the gas density quantity at middle point can be regarded as that of each segment. According to the collision cross-section, select a random number to determine the evolution of particle states in each segments. With that particle simulation, the neutralization efficiency is estimated.

Paper

Title

Other Keywords

Page

MOPCP088

The Simulation on Beam Interaction with Background Particles

target, ion, simulation, ion-source

230

C.D. Hu, L.Z. Liang, J.L. Wei
ASIPP, Hefei, People's Republic of China

Funding: Supported by the National Nature Science Foundation of China (10875146) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Y05FCQ0128)
A particle simulation with Monte Carlo was developed to study beam interaction with background particles in neutral beam injector. The collision processes associated with charge state change and reaction cross-section were analyzed for neutralization and re-ionization. Take the neutralization processes as a reference, for the positive arc discharge ion source, there are three different original ion species in the energetic ion beam. In evolution, a fast particle will suffer kinds of collisions decided by the collision cross-section or no impact within the target gas. Classify those collisions and their cross-sections according the change of charge state and momentum. Discretize the distribution of target gas density along the neutralizer properly. As a result, the neutralizer is divided into many extremely short segments averagely. So the gas density quantity at middle point can be regarded as that of each segment. According to the collision cross-section, select a random number to determine the evolution of particle states in each segments. With that particle simulation, the neutralization efficiency is estimated.