Diagnosis of fast ions produced by negative-ion neutral-beam injection with fast-ion deuterium-alpha spectroscopy

The Review of Scientific Instruments
C M MuscatelloH Yamaguchi

Abstract

Negative-ion neutral-beam injection (NNBI) is an important source of heating and current drive for next-step fusion devices where the injected energy can range from hundreds of keV to 1 MeV. Few diagnostics are suitable for phase-space resolved measurements of fast ions with energy in excess of 100 keV. A study to assess the feasibility of fast-ion deuterium-alpha (FIDA) spectroscopy to diagnose high-energy ions produced by NNBI is presented. Case studies with the Large Helical Device (LHD) and JT-60SA illustrate possible solutions for the measurement. The distribution function of fast ions produced by NNBI is calculated for both devices, and the FIDA spectrum is predicted by synthetic diagnostic simulation. Results with 180 keV NNBI in LHD show that, with a judicious choice of viewing geometry, the FIDA intensity is comparable to that obtained with the existing FIDA system. The measurement is more challenging with the 500 keV NNBI in JT-60SA. Simulations predict the FIDA intensity to be about 1% of the background bremsstrahlung, which is small compared to existing FIDA implementations with positive neutral-beam injection where signal levels are an order of magnitude larger. The sampling time required to extract the small FIDA ...Continue Reading

References

Apr 7, 2007·The Review of Scientific Instruments·Y LuoP Gohil
Dec 3, 2008·The Review of Scientific Instruments·M PodestàR Feder
Dec 3, 2008·The Review of Scientific Instruments·E DelabieO Marchuk
Nov 3, 2010·The Review of Scientific Instruments·C M MuscatelloK H Burrell
Nov 3, 2010·The Review of Scientific Instruments·W W Heidbrink
Nov 3, 2010·The Review of Scientific Instruments·A BortolonM Podestà
Dec 4, 2013·The Review of Scientific Instruments·B GeigerM Garcia-Munoz
Mar 19, 2016·Physical Review Letters·C S CollinsUNKNOWN DIII-D team
Dec 3, 2016·The Review of Scientific Instruments·N G BolteP Petrov

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