A movable Allison type emittance scanner is being developed to characterize the phase-space distribution of the beamlets of spectral phase interferometry for direct electric-field reconstruction, the prototype RF negative ion source of the ITER heating neutral beam injector. To test the electronics and verify the capability of the device to resolve nearby beamlets, a compact RF ion source prototype has been set up, capable of accelerating 1 mA of helium ions up to a voltage of 2 kV. A commercial 100 W RF generator creates a plasma inside a Pyrex tube, with a density between 1015 and 1016 m-3 and an electron temperature up to 15 eV. Three multi-aperture grids in accel-decel configuration extract and accelerate the ions, which are measured with a Faraday cup. We present in this paper the characterization of the ion source and its first operation, showing that it is suitable for the commissioning of the Allison scanner.

中文翻译：

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CRISP：用于发射扫描仪测试的紧凑型射频离子源原型

正在开发可移动的 Allison 型发射扫描仪，以表征用于直接电场重建的光谱相位干涉法子束的相空间分布，这是 ITER 加热中性束注入器的原型 RF 负离子源。为了测试电子设备并验证设备解析附近子束的能力，已经建立了一个紧凑的射频离子源原型，能够将 1 mA 的氦离子加速到 2 kV 的电压。商用 100 W RF 发生器在 Pyrex 管内产生等离子体，密度在 1015 到 1016 m-3 之间，电子温度高达 15 eV。加速-减速配置的三个多孔径网格提取和加速离子，这些离子是用法拉第杯测量的。我们在本文中介绍了离子源的特性及其首次操作，