Surface thermocouples for measurement of pulsed heat flux in the divertor of the Alcator C-Mod tokamak

被引：36

作者：

Brunner, D. ^{[1
]}

LaBombard, B. ^{[1
]}

机构：

[1] MIT PSFC, Cambridge, MA 02139 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2012年 / 83卷 / 03期

关键词：

SCRAPE-OFF LAYER; JUNCTION THERMOCOUPLES;

D O I：

10.1063/1.3689770

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A novel set of thermocouple sensors has been developed to measure heat fluxes arriving at divertor surfaces in the Alcator C-Mod tokamak, a magnetic confinement fusion experiment. These sensors operate in direct contact with the divertor plasma, which deposits heat fluxes in excess of similar to 10 MW/m(2) over an similar to 1 s pulse. Thermoelectric EMF signals are produced across a non-standard bimetallic junction: a 50 mu m thick 74% tungsten-26% rhenium ribbon embedded in a 6.35 mm diameter molybdenum cylinder. The unique coaxial geometry of the sensor combined with its single-point electrical ground contact minimizes interference from the plasma/magnetic environment. Incident heat fluxes are inferred from surface temperature evolution via a 1D thermal heat transport model. For an incident heat flux of 10 MW/m(2), surface temperatures rise similar to 1000 degrees C/s, corresponding to a heat flux flowing along the local magnetic field of similar to 200 MW/m(2). Separate calorimeter sensors are used to independently confirm the derived heat fluxes by comparing total energies deposited during a plasma pulse. Langmuir probes in close proximity to the surface thermocouples are used to test plasma-sheath heat transmission theory and to identify potential sources of discrepancies among physical models. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3689770]

引用

页数：7

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