VUV study of impurity generation during ICRF heating experiments on the Alcator C tokamak

Technical Report · Sun Jun 01 04:00:00 EDT 1986

OSTI ID:5565583

Manning, H L

A 2.2 meter grazing incidence VUV monochromator has been converted into a time-resolving spectrograph by the addition of a new detector system, based on a microchannel plate image intensifier linked to a 1024-element linear photodiode array. The system covers the wavelength range 15 to 1200 A (typically 40 A at a time) with resolution of up to .3 A FWHM. Time resolution is selectable down to 0.5 msec. The system sensitivity was absolutely calibrated below 150 A by a soft x-ray calibration facility. The spectrograph was installed on the Alcator C tokamak at MIT to monitor plasma impurity emission. There, cross-calibration with a calibrated EUV monochromator was performed above 400 A. Calibration results, system performance characteristics, and data from Alcator C are presented. Observations of impurity behavior are presented from a series of ICRF heating experiments (180 MHz, 50 to 400 kW) performed on the Alcator C tokamak, using graphite limiters and stainless steel antenna Faraday shields.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5565583
• Report Number(s): DOE/ET/51013-185; PFC/RR-86-14; ON: TI86013660
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ALCATOR DEVICE
CALIBRATION
CARBON IONS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
IMPURITIES
IONS
MEASURING INSTRUMENTS
OXYGEN IONS
PERFORMANCE
PLASMA DIAGNOSTICS
PLASMA HEATING
SPECTROMETERS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES