The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Lapin, R.L. AU - Golubev, S. AU - Izotov, I. AU - Razin, S. AU - Shaposhnikov, R.A. AU - Skalyga, V. AU - Tarvainen, O.A. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Gasdynamic ECR Tandem Ion Source for Negative Hydrogen Ion Production J2 - Proc. of ECRIS2018, Catania, Italy, 10-14 September 2018 C1 - Catania, Italy T2 - International Workshop on ECR Ion Sources T3 - 23 LA - english AB - H⁻ ion sources are in great demand for beam injection into cyclotrons and storage rings utilizing charge exchange extraction or injection. The efficiency of proton beam production with the use of gasdynamic ECR ion source based on ECR discharge in a simple mirror trap has been recently demonstrated. It was then suggested to use the gasdynamic discharge as the first part of a tandem source for volumetric negative ion production. Experiments were performed with 37 GHz / up to 100 kW gyrotron power. Plasma was confined in a dual-trap magnetic system consisting of two equal simple mirror traps. The first trap was used for plasma production under the ECR condition. Dense hydrogen plasma flux from the first trap was allowed to flow into the second trap through a perforated conductive plate, which prevented propagation of the heating microwaves into the second one thus preventing plasma heating in the second chamber and allowing cold electrons to accumulate there. We present recent experimental results on this topic after optimization of the facility. We achieved a negative ion current density of 80 mA/cm² with a 1 mm plasma electrode aperture. PB - JACoW Publishing CP - Geneva, Switzerland SP - 191 EP - 194 KW - extraction KW - plasma KW - experiment KW - electron KW - ECR DA - 2019/01 PY - 2019 SN - 978-3-95450-196-0 DO - 10.18429/JACoW-ECRIS2018-THA5 UR - http://jacow.org/ecris2018/papers/tha5.pdf ER -