High current proton beams production at Simple Mirror Ion Source 37

Abstract

High current proton beams production at Simple Mirror Ion Source 37 Skalyga, V.; Izotov, I.; Razin, S.; Sidorov, A.; Golubev, S.; Kalvas, Taneli; Koivisto, Hannu; Tarvainen, Olli Skalyga, V., Izotov, I., Razin, S., Sidorov, A., Golubev, S., Kalvas, T., . . . , & Tarvainen, O. (2014 This paper presents the latest results of high current proton beam production at Simple Mirror Ion Source (SMIS) 37 facility at the Institute of Applied Physics (IAP RAS). In this experimental setup, the plasma is created and the electrons are heated by 37.5 GHz gyrotron radiation with power up to 100 kW in a simple mirror trap fulfilling the ECR condition. Latest experiments at SMIS 37 were performed using a single-aperture two-electrode extraction system. Proton beams with currents up to 450 mA at high voltages below 45 kV were obtained. The maximum beam current density was measured to be 600 mA/cm 2 . A possibility of further improvement through the development of an advanced extraction system is discussed. © 2013 AIP Publishing LLC.

An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

“…reaching the cut-off plasma density, it is possible to use higher microwave frequencies. Extraction of positive ion beams (up to 600 mA/cm 2 of H + ) from hydrogen discharge with microwave frequencies up to 37.5 GHz and heating power of 100 kW has been demonstrated [32]. This shows that technical limitations of plasma heating are far from 2.45 GHz microwave frequency.…”

H+ and D+ high current ion beams formation from ECR discharge sustained by 75 GHz gyrotron radiation

“…The experimental results described in [4,5] demonstrate the feasibility of high power millimeter wave quasigasdynamic ECR ion sources for the production of high brightness proton beams with favorable species fraction. For the next experimental step on H+ and D+ ion beams production SMIS 37 facility was upgraded up to SMIS 75 by replacing of the old gyrotron with the new one with 75 GHz radiation frequency and 200 kW peak power.…”

New approach for a “point-like” neutron source creation based on sharp focusing of a high quality deuteron beam produced by high-current gasdynamic ECR ion source

“…Experimental studies of ion beam properties and search for optimal discharge conditions for high brightness beam formation were carried out at SMIS 37 experimental facility [6][7][8]. SMIS 37 provides gyrotron radiation at 37.5 GHz frequency with peak power up to 100 kW in 1.5 ms pulses for plasma heating.…”

“…A Faraday cup was placed right behind the puller electrode to measure the total beam current passing through the extractor. Emittance of the extracted beam (all species together) was measured with "pepper-pot" method, which has been successfully tested earlier at SMIS 37 [6][7][8].…”

“…A size of the neutron emitting area would be determined by the quality of the ion beam and the efficiency of the beam focusing system (ie, the minimum size of the bombardment area). This proposal is based on recent developments [6][7][8] of the unique high-current ion source. Such source utilize high-power gyrotron millimeter-wave radiation for plasma production in an open magnetic trap under conditions of electron cyclotron resonance (ECR).…”