Johnson Noise Thermometry at High Pressure Yanbin Wang Takeshi Sanehira Ivan Getting Mark Rivers
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
Johnson Noise Thermometry at High Pressure
Yanbin WangTakeshi Sanehira
Ivan GettingMark Rivers
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
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
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
16 mm cell design
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
Ambient spectra before turning on AC power supply
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
JNT connected to cell, supply turned on
Solution: fire cell parts at 900 – 1100 C, burn off all glue and organic residues
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
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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.
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
Noise Reduction: high-frequency pickup
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Solution: Shutoff all unused electronics inside the hutch. Eliminate ground loop by defining common ground.
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
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.
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
Test data
500 K
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
Test data
800 K
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
First high T measurements to 800 K:Resistance drop near 600 K
Probe Resistance vs. T
y = 5.0682299809E-02x + 3.4709431275E+01
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
JNT output versus Temperature
NC Normalized Output vs. T
y = 2.6181294173E-03x - 2.6088699166E-01
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
First high T resultsJNT versus RT
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COMPRES Annual Meeting, Lake Morey, VM, June 17-20, 2007
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