NIO1 is a compact and versatile negative ion source, with a total current of 130?mA accelerated to 60 keV. Negative ions are created inside the plasma, which is inductively coupled to an external rf cylindrical coil operating in the range of 2 ± 0.2 MHz. The plasma is confined in the source chamber (a 50 mm radius cylinder) by a multipole magnetic field and the ions are extracted through a 3x3 matrix of apertures. The use of cesium, to enhance the negative ion production by H0bombardment of the surfaces, is foreseen in a second stage of the operation, so that at present time the source is operating in pure volume configuration. This paper presents a model aimed to describe the main physical phenomena occurring in the source, focusing on the rf coupling with the plasma and the evolution of plasma parameters in the source. With respect to more sophisticated models of negative ion sources here we aimed to develop a fast tool capable of qualitatively describing the response of the system to variations in the basic operating parameters. The findings of this models is finally compared with the first experimental results of NIO1.
|Publication status||Published - 8 Apr 2015|
|Event||4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 - Garching, Germany|
Duration: 8 Apr 2015 → …
|Conference||4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014|
|Period||8/4/15 → …|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)