Еmittance Measurements of a Gasdynamic Electron Cyclotron Resonant Ion Source

Abstract

The advantages of using a gasdynamic proton source based on electron cyclotron resonance in a compact neutron source with a proton accelerator of the DARIA project are discussed. A gasdynamic source of protons has been shown to provide a beam with a current of ~100 mA and a duration more than 100 μs at a repetition rate up to 1000 pulse/s. Using the "pepper-pot" method, measurements of the emittance have been performed of a beam generated by a gasdynamic source of electron cyclotron resonance with two geometric configurations of electrodes forming the beam: "spherical" and plane-parallel. It is shown that the normalized 4-rms emittance for both variants of the beam-formation system electrodes in the extraction voltage ranges from 41 to 48 kV and does not exceed 2π mm mrad.

On the Results in Physics Obtained in 2020‒2021

“…The source is based on a discharge maintained in a magnetic trap by microwave radiation from a gyrotron (a frequency of 28 GHz and a power of up to 10 kW) under the electron cyclotron resonance conditions, which ensure a record high (up to 200 W/cm 3 ) specific energy input for electron‒cyclotron resonance ion sources and allows one to create a plasma with a density of up to 10 13 cm –3 . Plasma flows with a density of up to 1.5 A/cm 2 from a trap were obtained [ 22 ].…”

Source of pure proton beams

“…To overcome these limitations, the Gasdynamic Ion Source for Multipurpose Operation (GISMO) facility has been created. It uses the radiation of a gyrotron with a frequency of 28 GHz and a power of up to 10 kW operating in a continuous mode [14,16]. The main difference between the GISMO and conventional continuous ECR ion sources is associated with the possibility of implementing a discharge in a quasigasdynamic confinement regime and a high volumetric energy input.…”