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The proton beam passing through the wall area of a liquid metal (LM) target container, called entrance window, is
causing deposition of maximum high heat flux amount 140 W/cm2.Previous experimental thermo-hydraulics investigations for the MEGAPIE LM-target at the SINQ facility of Heat-
Transfer-Coefficient (HTC) using InfraRed-Thermography (IRT) have been presented at Thermosense 2006 and 2007
[1], [2] and references therein. During these investigations the IRT active sensors with applied heat fluxes of the small
and low range from 2.5 to 15.2 W/cm2 are used. The heating shell foil of the sensor has been connected to steel dish enclosing
LM target container by using electrical insulation ceramic glue. A higher, then achieved 15 W/cm2, heat flux has
lead to delaminating of the heater.
Because of interest to determinate the HTC-chart under real heat flux conditions and investigate some positive effect
of heat flux buoyancy on cooling, the idea for the High Heat Flux (HHF) IRT Sensors, using of the Low Pressure Plasma
Spraying - Thin Film (LPPS-TF) technology of the Sulzer Metco Company has been created.
The paper presents the idea of multilayer thermal sprayed construction of HHF-IRT-Sensor, few realizations and some
results of the first pre-test performed at the PSI LBE Double Pump Loop using the new sensor and the 2DD IRT methodology
presented in [1].
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