W W Heidbrink et al 2004 Plasma Phys. Control. Fusion 46 1855 doi:10.1088/0741-3335/46/12/005
Hydrogenic fast-ion diagnostic using Balmer-alpha light
W W Heidbrink1, K H Burrell2, Y Luo1, N A Pablant3 and E Ruskov1
Show affiliationsHydrogenic fast-ion populations are common in toroidal magnetic fusion devices, especially in devices with neutral beam injection. As the fast ions orbit around the device and pass through a neutral beam, some fast ions neutralize and emit Balmer-alpha light. The intensity of this emission is weak compared with the signals from the injected neutrals, the warm (halo) neutrals and the cold edge neutrals, but, for a favourable viewing geometry, the emission is Doppler shifted away from these bright interfering signals. Signals from fast ions are detected in the DIII-D tokamak. When the electron density exceeds ~7 × 1019 m−3, visible bremsstrahlung obscures the fast-ion signal. The intrinsic spatial resolution of the diagnostic is ~5 cm for 40 keV amu−1 fast ions. The technique is well suited for diagnosis of fast-ion populations in devices with fast-ion energies (~30 keV amu−1), minor radii (~0.6 m) and plasma densities (
1020 m−3) that are similar to those of DIII-D.
- PACS
-
52.70.-m Plasma diagnostic techniques and instrumentation
- Subjects
- Dates
-
Issue 12 (December 2004)
Received 30 June 2004, in final form 15 October 2004
Published 16 November 2004
-
Hydrogenic fast-ion diagnostic using Balmer-alpha light
W W Heidbrink et al 2004 Plasma Phys. Control. Fusion 46 1855
-
Atomic scale memory at a silicon surface
R Bennewitz et al 2002 Nanotechnology 13 499
-
Final report on key comparison APMP.AUV.A-K3
Hyu-Sang Kwon et al 2012 Metrologia 49 09002
-
An international comparison of mass fraction purity assignment of digoxin: The Comité Consultatif pour la Quantité de Matière (CCQM) Pilot Study CCQM-P20.f (Digoxin)
S Westwood et al 2011 Metrologia 48 08013
-
Photometry, radiometry and 'the candela': evolution in the classical and quantum world
Joanne C Zwinkels et al 2010 Metrologia 47 R15
-
Final report on the key comparison EUROMET-AUV.V-K1.1
Th Bruns 2010 Metrologia 47 09001
-
Advice from the CCL on the use of unstabilized lasers as standards of wavelength: the helium–neon laser at 633 nm
J A Stone et al 2009 Metrologia 46 11
-
An international comparison of mass fraction purity assignment of theophylline: CCQM Pilot Study CCQM-P20.e (Theophylline)
S Westwood et al 2009 Metrologia 46 08019
-
Revised formula for the density of moist air (CIPM-2007)
A Picard et al 2008 Metrologia 45 149
-
Final report of the on-going key comparison BIPM.QM-K1: Ozone at ambient level, comparison with VNIIM, 2007
Joële Viallon et al 2008 Metrologia 45 08009
Users also read
What's this?Related review articles
What's this?- Spectra of hollow ions in an ultradense laser plasma
- Emissive probes
- Multi-dimensional optical and laser-based diagnostics of low-temperature ionized plasma discharges