Neutral beam interlock system on TFTR using infrared pyrometry

Journal Article · Fri Aug 01 04:00:00 EDT 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138739· OSTI ID:5405940

Medley, S S; Kugel, H W; Kozub, T A; Lowrance, J L; Mastrocola, V; Renda, G; Young, K M

Although the region of the Tokamak Fusion Test Reactor (TFTR) vacuum vessel wall which is susceptible to damage by neutral beam strike is armored with a mosaic of TiC-clad POCO graphite tiles, at power deposition levels above 2.5 kW/cm/sup 2/ the armor surface temperature exceeds 1200 /sup 0/C within 250 ms, and itself becomes susceptible to damage. In order to protect the wall armor, a neutral beam interlock system based on infrared pyrometry measurement of the armor surface temperature was installed on TFTR. For each beamline, a three-fiber-optic telescope views three areas of --30 cm diameter centered on the armor hot spots for the three ion sources. Each signal is fiber-optic coupled to a remote 900-nm pyrometer which feeds analog signals to the neutral beam interrupt circuits. The pyrometer interlock system is designed to interrupt each of the 12 ion sources independently within 10 ms of the temperature exceeding a threshold which can be set in the range of 500--2300 /sup 0/C. A description of the pyrometer interlock system and its performance will be presented.

• Research Organization: Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08544
• OSTI ID: 5405940
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 57:8; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
700205 -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
BEAM INJECTION
DAMAGE
ELECTROMAGNETIC RADIATION
HEATING
INFRARED RADIATION
MEASURING INSTRUMENTS
NEUTRAL ATOM BEAM INJECTION
PERFORMANCE
PHOTOMETRY
PLASMA DIAGNOSTICS
PLASMA HEATING
PYROMETERS
RADIATIONS
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS