High resolution measurements of neutral density and ionization rate in the Alcator C-Mod tokamak

Journal Article · Mon Jan 01 04:00:00 EST 2001 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1319362· OSTI ID:40204874

Boivin, R L; Hughes, J W; LaBombard, B; Mossessian, D; Terry, J L

Two new high resolution detectors have been installed on the Alcator C-Mod tokamak to measure the neutral density and ionization rate at the edge of the main chamber plasma. Using a silicon detector sensitive to UV light, and a very narrow filter with transmission peaking at 1216 Aa, the Lyman alpha radiation emanating from neutral deuterium (and hydrogen) is measured. The detectors consist of 20 channel arrays which view the plasma tangentially 12.5 cm below the outer midplane, and 10 cm above the inner midplane. The imaging is performed using a 1mmx3mm slit, which gives a nominal radial resolution of 2 and 3 mm, respectively. The local emissivity is obtained via a standard Abel inversion technique. Employing well-known branching ratios, and using measured local electron density and temperature, the neutral density and ionization rate are inferred with similar radial resolution. Details of the setup and sensitivity of the results to plasma conditions are discussed.

• Sponsoring Organization: (US)
• OSTI ID: 40204874
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 72; ISSN 0034-6748
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
BRANCHING RATIO
DEUTERIUM
ELECTRON DENSITY
EMISSIVITY
HYDROGEN
IONIZATION
LYMAN LINES
PLASMA
RESOLUTION
SENSITIVITY
SILICON