Ten-channel grating polychromator for electron cyclotron emission plasma diagnostics

Journal Article · Thu Sep 01 00:00:00 EDT 1983 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1137528· OSTI ID:5843865

Fischer, J; Boyd, D A; Cavallo, A; Benson, J

A grating polychromator for electron cyclotron temperature diagnostic experiments is described. Two aluminum gratings are used to allow the instrument to operate for tokamak magnetic fields between 16--25 kG, i.e., for second harmonic electron cyclotron emission frequencies ranging between 90--140 GHz. The instrument utilizes an array of ten cryogenically cooled InSb hot electron bolometers to collect radiation at the focal surface of the spectrometer covering a fractional plasma radial distance of ..delta..R/R/sub 0/approx.0.3--0.4, where R/sub 0/ is the major radius of the plasma. The resolving power of the spectrometer has been measured to be R = ..nu../delta..nu..roughly-equal50. This instrument thus provides high spatial (3 cm) and temporal resolution (approx.1 ..mu..s) and large spatial coverage. The detector cryostat has measured cryogen hold times of > or =24 h (liquid nitrogen) and roughly-equal9 days (liquid helium) providing ease of operation during long plasma runs.

• Research Organization: Laboratory for Plasma and Fusion Energy Studies, University of Maryland, College Park, Maryland 20742
• OSTI ID: 5843865
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 54:9
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OPTICAL EQUIPMENT
OPERATION
RESOLUTION
PLASMA DIAGNOSTICS
ANTIMONY COMPOUNDS
BOLOMETERS
CRYOSTATS
CYCLOTRON HARMONICS
EMISSION
GHZ RANGE 01-100
GHZ RANGE 100-1000
INDIUM COMPOUNDS
MAGNETIC FIELDS
SPECTROMETERS
TOKAMAK DEVICES
CLOSED PLASMA DEVICES
CONTROL EQUIPMENT
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
HARMONICS
MEASURING INSTRUMENTS
OSCILLATIONS
THERMONUCLEAR DEVICES
THERMOSTATS
700102* - Fusion Energy- Plasma Research- Diagnostics