Proton injector acceptance tests for a Dielectric Wall Accelerator (DWA):characterisation of Advanced Injection System of Light Ions (AISLI)

To demonstrate the acceleration capability of a Dielectric Wall Accelerator (DWA), a proton injector has been developed at Peking University (PKU). It is composed of a compact permanent magnet 2.45GHz Electron Cyclotron Resonance Ion Source (PKU PMECRIS) associated with a LEBT of two electrostatic Einzel lenses [1]. This injector is named as Advanced Injector System of Light Ions (AISLI). The acceptance tests have been performed with a 40keV–55mA hydrogen beam successfully passing through a ϕ 10mm aperture diaphragm. This diaphragm is located 200mm downstream the plasma emission hole at the location of the future DWA entrance flange. The beam rms emittance reached about 0.10πmmmrad in pulsed mode. This article describes the AISLI experimental setup, the measurement principle and the obtained beam characteristics.