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An electron cyclotron resonance microwave H+ ion source featuring low normalized beam emittance (<1 π mm mrad) and up to 20mA at 35keV beam energy has been developed at the HUN-REN Centre for Energy Research in Budapest, Hungary. The beam can be operated in a continuous or pulsed way that is adjustable in duration (0.1-10ms) and frequency (0.01-40Hz) at 35keV. A novel optical diagnostic system has been implemented, providing high-voltage insulation (up to 40 kV) between the plasma chamber and the camera. Viewports consisting of 10 mm diameter holes sealed with glass windows are implemented on both the plasma chamber and the extraction chamber. These are angled in a way to observe the extraction aperture of the proton beam from both the plasma chamber and the ion optics region. The insulation of an endoscopic camera with an outer diameter of 4mm is accomplished with a glass tube and a glued flat lens. The experimental validation of the high-voltage insulation properties of the adhesive and the different thicknesses of the glass has been conducted. Moreover, the ion optics design has been optimized for gas flow and precise electrode assembly by refining parts using additive manufacturing. This study describes a unique optical diagnostic design to observe and evaluate the H+ plasma and the extracted ion beam as a function of microwave power and hydrogen flow rate, along with improvements to the ion optics design for optimized gas conductance and simplified electrode assembly.
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