Paper  Title  Page 

MOPD37  Electrode Design of the ESSBilbao Accelerator Proton Extraction System  144 


The goal of extracting high proton currents from the ECR source of the Bilbao Accelerator has required comprehensive and interactive studies by using systematic beam dynamics simulations to derive acceptable geometric parameters for the projected electrode extraction system. Two tetrode designs were mainly analyzed; the first is based on a Pierce geometry; and the second on a spherically convergent extraction system. Both designs consist of a plasma electrode at 75kV, and then, a puller system formed by a grounded electrode separated from the plasma chamber to a certain extractiongap distance, an electron repeller electrode fed at 3kV, and finally a grounded electrode. Geometric parameters such as the distances between electrodes, the different electrode apertures, the plasma electrode angle related to the Pierce layout, and also, the plasma and extraction electrode radial shapes related to the spherical extractor design were optimized for a 70mA proton beam. 

THO1B05  First LEBT Simulations for the Bilbao Accelerator Ion Source Test Stand  595 


The Proposed Multispecimen Low Energy Transport System (LEBT) consists of a series of solenoids with tunable magnetic fields, used to match the characteristics of the beam to those imposed by the RFQ input specification. The design of the LEBT involves selecting the number of solenoids to use and their fixed positions, so that the set of fields that provides the desired matching can be found for any given conditions (different currents, input emittances, etc). In this work we present the first simulations carried out to design the Bilbao Accelerator LEBT, which were peformed using several codes (Track, GPT, Trace2D). The best configuration is discussed and evaluated in terms of the degree of matching to the RFQ input requirements. 

