Ion beam formation in a gas-dynamic electron cyclotron resonance ion source

Abstract

Generation of quasistationary flows of multicharged ions with a current density of up to 1 A/cm2 from a dense electron cyclotron resonance plasma confined in a magnetic trap under the quasi-gas-dynamic regime has been achieved [Golubev et al., Trans. Fusion Sci. Technol. 47, 345 (2005)]. This technique provides opportunities for extracting high current multicharged ion beams. The present research is concerned with experimental and theoretical investigations of two ion extraction systems for the gas-dynamic ion sources. (1) Single-aperture system. In this case, there is a principal possibility to obtain ion beams with low emittance by using a small-diameter aperture for extraction. Here we describe investigations aimed at creating nitrogen ion beams (the main ion in the spectrum is N2+) with currents of up to 6.5 mA through a 1.5 mm aperture in the plasma electrode. (2) Multiaperture system. Such systems provide significantly higher beam currents. First results of testing an extractor with five apertures are presented in this article

High current proton beams production at Simple Mirror Ion Source 37

“…This is because the plasma density on the downstream side of the mirror scales with the magnetic field. 7 The possibility of increasing the beam current of SMIS 37 by using a 3-electrode extractor has been demonstrated in Ref. 7 for multicharged nitrogen ion beams.…”

“…The plasma electrode was placed 10 cm downstream from the magnetic mirror to limit the extracted ion flux as described in Ref. 7, which helps improving the beam transport through the puller. The maximum available extraction voltage was 45 kV.…”

New progress of high current gasdynamic ion source (invited)

“…[1][2][3][4][5] In this paper, the main results obtained some years ago are shown to demonstrate the typical source performance. In Fig.…”

“…H+ beams are utilized or envisioned for use in linear accelerators, e.g., the future European Spallation Source under design; 12,13 some special applications such as neutron generators or the International Fusion Materials Irradiation Facility (IFMIF) project, 3 require D+ (deuteron) ion beams. Requirements for the brightness of such beams grow together with the demand of accelerator development and arising experimental needs.…”

“…[1][2][3][4][5] In the beginning, the work was devoted to development of a high frequency ECR source of multi-charged ions with outstanding parameters of plasma heating (37.5 GHz, 100 kW). According to Geller's scaling laws, 6 such increase in frequency and power in comparison to conventional electron cyclotron resonance ion source (ECRIS) was expected to boost the ion source performance and provide a significant progress in ECRIS development.…”