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Johnson Noise Thermometry at High Pressure Yanbin Wang Takeshi Sanehira Ivan Getting Mark Rivers

Johnson Noise Thermometry at High Pressure Yanbin Wang Takeshi Sanehira Ivan Getting Mark Rivers. Status. COMPRES support Dr. Takeshi Sanehira on board since Dec 2006 Developing JNT cell Testing new probe resistors Identify noise sources and ground loop issues

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Johnson Noise Thermometry at High Pressure Yanbin Wang Takeshi Sanehira Ivan Getting Mark Rivers

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  1. Johnson Noise Thermometry at High PressureYanbin WangTakeshi SanehiraIvan GettingMark Rivers COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  2. Status • COMPRES support • Dr. Takeshi Sanehira on board since Dec 2006 • Developing JNT cell • Testing new probe resistors • Identify noise sources and ground loop issues • Setup tests on transformers, variac, powerline filter • High P-T tests, Feb ~ Apr: • Sanehira, Wang, Getting, Labenski (NIST; attempted to hire as a temp employee) • First high P-T results to ~1000 K, 0.1-0.3 GPa COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  3. 16 mm cell design COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  4. Ambient spectra before turning on AC power supply COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  5. JNT connected to cell, supply turned on Solution: fire cell parts at 900 – 1100 C, burn off all glue and organic residues COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  6. Noise Reduction: Power Supply Solution: replaced existing supply with a transformer and added a powerline conditioner (Sola) to ensure pure sinusoidal output at 60 Hz. COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  7. 18 kHz 92 kHz 37 kHz 73 kHz 55 kHz Noise Reduction: high-frequency pickup Solution: Shutoff all unused electronics inside the hutch. Eliminate ground loop by defining common ground. COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  8. Noise reduction: 60-Hz harmonics 200 C Solution: Apply numerical notch filters for 60 Hz (5 -10 Hz width).Apply a higher cutoff to the high-pass filter, throw away signals below 20 kHz. COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  9. Test data 500 K COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  10. Test data 800 K COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  11. First high T measurements to 800 K:Resistance drop near 600 K COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  12. JNT output versus Temperature COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  13. First high T results COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

  14. Future plans • Noise reduction!! • New filters for JNT (expand frequency range to 100 kHz, vs. 70 kHz) - ordered • New transformer – received • 16 mm cell for “zero P” calibration • Smaller cells and truncations for higher P measurements • Beamtime proposal for 2007-3 (measure P using diffraction) • New resistors • Cermets versus sintered diamond • Pyrometry cross-check COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007

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