Abstract
Important features of Electron Cyclotron Resonance Ion Source (ECRIS) operation are accurately reproduced with a numerical code. The code uses the particle-in-cell technique to model a dynamics of ions in ECRIS plasma. It is shown that gas dynamical ion confinement mechanism is sufficient to provide the ion production rates in ECRIS close to the experimentally observed values. Extracted ion currents are calculated and compared to the experiment for few sources. Changes in the extracted ion currents are obtained with varying the gas flow into the source chamber and the microwave power. Empirical scaling laws for ECRIS design are studied and the underlying physical effects are discussed.
Highlights
The electron cyclotron resonance ion source (ECRIS) is a plasma-based device designed to produce intense beams of multiply charged ions [1]
Microwave power is in the kW range and frequency of the microwaves is of a few GHz, with the modern ECRIS designs aimed to 56 GHz or higher
The simulated charge state distribution (CSD) for KVI-AECRIS is shown in Fig. 5 for the source conditions optimized to produce the maximal current of Ar8þ ions
Summary
The electron cyclotron resonance ion source (ECRIS) is a plasma-based device designed to produce intense beams of multiply charged ions [1]. The ECR (electron cyclotron resonance) surface should be closed and not touching the vacuum chamber walls to get the plasma electron temperature around 1 keV favorable for producing the highly charged ions. Those lines are shown that cross the ECR zone, where the main plasma production takes place. It has been commonly argued that a potential dip should be formed inside the ECR zone in respect to the globally positive plasma potential to balance the ion and electron losses out the ECRIS plasma [5]. Spatial distributions of the plasma inside the source and of the ion fluxes to the walls are discussed, ion confinement times are estimated.
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