LARP LARP Document 1098-v1

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Protection heater design validation for the LARP magnets using thermal imaging

Document #:
Document type:
Submitted by:
Giorgio Ambrosio
Updated by:
Giorgio Ambrosio
Document Created:
23 Dec 2015, 16:39
Contents Revised:
23 Dec 2015, 16:39
DB Info Revised:
23 Dec 2015, 16:39
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  • Public document
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Protection heaters are essential elements of a quench protection scheme for LARP high-field accelerator magnets. Various heater designs fabricated by LARP and CERN have already been tested in the LARP high-field quadrupole HQ, and presently being built into the coils of high-field quadrupole MQXF. In order to compare heat flow characteristics and thermal diffusion timescales of different heater designs, we powered heaters of two different geometries in ambient conditions and imaged resulting thermal distributions using a high-sensitivity thermal video camera. We observed peculiar spatial periodicity in the temperature distribution maps potentially linked to the structure of the underlying cable. 2D numerical simulation of heat diffusion and spatial heat distribution have been conducted, and results of the simulation and experiment have been compared. Imaging revealed hot spots formed due to a current concentration around high curvature points of heater strip of varying cross-section, and visualized thermal effects of various inter-layer structural defects. Thermal imaging can become a future quality control tool for the MQXF coil heaters.
Files in Document:
  • pdf (Maxim_Heater_Validation_Thermal_Imaging.pdf, 797.3 kB)
Associated with Events:
MT24 held from 18 Oct 2015 to 23 Oct 2015 in Seoul, Korea
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