Fiber Temperature Sensor SBIR Phase I Final Technical Report
Superconducting magnets used in accelerators and fusion systems require temperature sensors that can operate at cryogenic temperature in an environment that has significant electromagnetic noise and ionizing radiation. A sensor was investigated that is based on measuring temperature-dependent spectra of silicon vacancy centers in diamond. Emission spectra collected from 6 to 120 K showed line strength ratios that indicated partial thermalization of the spin degree of freedom within the excited state manifold. The ratios can be used to infer temperature. The ratio also depends on magnetic field, so more work is needed to develop a spectral analysis that is independent of magnetic field. Several prototype probes were designed, using 0.5 mm cubic nitrogen vacancy diamonds in place of silicon vacancy diamonds. The prototypes suggest some useful designs for a completely fiberized sensor. An embedded sensor would be useful for quench detection. The fluorescence count rate should increase to at least on billion counts per second in order to achieve the millisecond time response needed for quench detection. Higher count rates will also permit high accuracy measurements needed for calorimetry.
- Research Organization:
- Southwest Sciences
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0018661
- OSTI ID:
- 1509719
- Type / Phase:
- SBIR (Phase I)
- Report Number(s):
- DOE-SWSC-18661; 5136739002
- Country of Publication:
- United States
- Language:
- English
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