Design of a beam emission spectroscopy diagnostic for negative ions radio frequency source SPIDER

The Review of Scientific Instruments
B ZaniolM Barbisan

Abstract

A facility will be built in Padova (Italy) to develop, commission, and optimize the neutral beam injection system for ITER. The full scale prototype negative ion radio frequency source SPIDER, featuring up to 100 kV acceleration voltage, includes a full set of diagnostics, required for safe operation and to measure and optimize the beam performance. Among them, beam emission spectroscopy (BES) will be used to measure the line integrated beam uniformity, divergence, and neutralization losses inside the accelerator (stripping losses). In the absence of the neutralization stage, SPIDER beam is mainly composed by H(-) or D(-) particles, according to the source filling gas. The capability of a spectroscopic diagnostic of an H(-) (D(-)) beam relies on the interaction of the beam particles with the background gas particles. The BES diagnostic will be able to acquire the H(α) (D(α)) spectrum from up to 40 lines of sight. The system is capable to resolve stripping losses down to 2 keV and to measure beam divergence with an accuracy of about 10%. The design of this diagnostic is reported, with discussion of the layout and its components, together with simulations of the expected performance.

References

Jul 23, 2004·The Journal of Chemical Physics·Peter W BarnesIan W M Smith
Dec 3, 2008·The Review of Scientific Instruments·Gianluigi SerianniMarco Valisa
Mar 3, 2012·The Review of Scientific Instruments·R PasqualottoB Zaniol

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Citations

Mar 7, 2014·The Review of Scientific Instruments·M BarbisanR Pasqualotto
Nov 29, 2014·The Review of Scientific Instruments·M BarbisanR Pasqualotto
Feb 6, 2020·The Review of Scientific Instruments·Barbara ZaniolMargherita Ugoletti
Aug 10, 2017··M. BernardiM. Dalla Palma

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Methods Mentioned

BETA
chips

Software Mentioned

STRIKE
SPIDER
MITICA

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