Beam diagnostic tools for the negative hydrogen ion source test facility ELISE

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• 作者：Riccardo Nocentini ; Ursel Fantz ; Peter Franzen ; Markus Froeschle ; Bernd Heinemann ; Rudolf Riedl ; Benjamin Ruf ; Dirk Wuenderlich ; the NNBI team
• 关键词：Neutral beam injector ; ITER ; Negative ion source ; RF source ; FEM ; Calorimeter ; Doppler shift spectroscopy
• 刊名：Fusion Engineering and Design
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：88
• 期：6-8
• 页码：913-917
• 全文大小：1699 K

文摘

The test facility ELISE, presently being commissioned at IPP, is a first step in the R&D roadmap for the RF driven ion source and extraction system of the ITER NBI system. The ¡°half-size¡± ITER-like test facility includes a negative hydrogen ion source that can be operated for 1 h. ELISE is expected to extract an ion beam of 20 A at 60 kV for 10 s every 3 min, therefore delivering a total power of 1.2 MW. The extraction area has a geometry that closely reproduces the ITER design, with the same width and half the height, i.e. 1 m ¡Á 1 m.

This paper presents an overview of beam diagnostic tools foreseen for ELISE. For the commissioning phase, a simple beam dump with basic diagnostic capabilities has been installed. In the second phase, the beam dump will be substituted by a more sophisticated diagnostic calorimeter to allow beam profile measurement. Additionally, a tungsten wire mesh will be introduced in the beam path to provide a qualitative picture of beam size and position. Stripping losses and beam divergence will be measured by means of H_¦Á Doppler shift spectroscopy. An absolute calibration is foreseen in order to measure beam intensity.