Extended fast-ion D-alpha diagnostic on DIII-D

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3475367· OSTI ID:22055763

Muscatello, C M; Heidbrink, W W ^[1]; Taussig, D; Burrell, K H ^[2]

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1. University of California, Irvine, California 92697 (United States)
2. General Atomics, San Diego, California 92186 (United States)

A fast-ion deuterium-alpha (FIDA) diagnostic, first commissioned on DIII-D in 2005, relies on Doppler-shifted light from charge-exchange between beam neutrals and energetic ions. The second generation (2G) system was installed on DIII-D in 2009. Its most obvious improvement is the spatial coverage with 11 active in-beam and three passive off-beam views; the latter allows for simultaneous monitoring of the background signal. Providing extended coverage in fast-ion velocity space, the new views possess a more tangential component with respect to the toroidal field compared to their first generation counterparts. Each viewing chord consists of a bundle of three 1.5 mm core fibers to maximize light gathering. For greater throughput, fast f/1.8 optical components are used throughout. The signal is transmitted via fiber optics to a patch panel, so the user is able to choose the detector. FIDA was originally installed with a spectrometer and charge-coupled device (CCD) camera to monitor the full D{sub {alpha}} spectrum for two spatial views. 2G adds another spectrometer and CCD that monitor the blue-shifted wing for six spatial views at 1 kHz. In addition, a photomultiplier tube and fast digitizer provide wavelength-integrated signals at 1 MHz for eight spatial views.

• OSTI ID: 22055763
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALPHA PARTICLES
BEAMS
CHARGE EXCHANGE
CHARGE-COUPLED DEVICES
DEUTERIUM
DOPPLER EFFECT
DOUBLET-3 DEVICE
FIBER OPTICS
KHZ RANGE
MHZ RANGE
PHOTOMULTIPLIERS
SIGNALS
SPECTROMETERS
TAIL IONS
VISIBLE RADIATION