Bolometric diagnostics in JET

Journal Article · Wed May 01 04:00:00 EDT 1985 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138007· OSTI ID:5665481

Mast, K F; Krause, H; Behringer, K; Bulliard, A; Magyar, G

Radiation losses from the JET plasma are measured (temporally and spatially resolved) with three pin-hole cameras which observe one poloidal plasma cross section from underneath (one vertical camera with 14 bolometers) and from the side (two horizontal cameras with 10 bolometers each). In addition, eight collimated single bolometers monitor toroidal symmetry of plasma emissivity. An improved metal resistor bolometer capable of surviving at least 5000 D--T pulses in JET is composed of two identical foils (4-..mu..m-thick gold absorber, 7.5-..mu..m-thick Kapton substrate, and 0.1-..mu..m-thick gold resistor), mounted one behind another in one housing. The rear foil serves as a reference bolometer in a bridge circuit. With an integration time constant of 20 ms a detection limit of 70 ..mu..W/cm/sup 2/ was measured in JET. Examples of measuring results in JET are presented: strong poloidal asymmetries of the radiation density as precursor signals of a density limit disruption and the formation of a poloidally symmetric, cold plasma mantle before a disruption.

• Research Organization: EURATOM-IPP Association, IPP Garching, Federal Republic of Germany
• OSTI ID: 5665481
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 56:5; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BOLOMETERS
CAMERAS
DATA
ELECTROMAGNETIC RADIATION
EMISSIVITY
ENERGY LOSSES
EXPERIMENTAL DATA
INFORMATION
IONIZING RADIATIONS
JET TOKAMAK
LOSSES
MAGNETIC FIELDS
MEASURING INSTRUMENTS
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA DIAGNOSTICS
RADIATIONS
SENSITIVITY
SURFACE PROPERTIES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
ULTRAVIOLET RADIATION
X RADIATION