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SIST Outbrief

SIST Outbrief. 07 Aug 2007. Supervisor: Yuriy Pischalnikov, Technical Division. C1C Adam Stooke USAF Academy Physics Department. C08Adam.Stooke@usafa.af.mil. Resonance Control: Pre-Load & A Case Study in Measurement. Outline. Superconducting Radio Frequency (SCRF) Cavities

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SIST Outbrief

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  1. SIST Outbrief 07 Aug 2007 Supervisor: Yuriy Pischalnikov, Technical Division C1C Adam Stooke USAF Academy Physics Department C08Adam.Stooke@usafa.af.mil

  2. Resonance Control: Pre-Load & A Case Study in Measurement

  3. Outline • Superconducting Radio Frequency (SCRF) Cavities • Resonance & Tuning • Measuring the Preload • Current Configuration • New Hardware Profile • Recommended Improvements

  4. Superconducting RF Cavity

  5. Operational Hurdle: Cost • Energy/Power Consumption • Land, Materials, Production • Precision

  6. f1/2 1.3 GHz Energy Savings • SC RF Cavities • Electromagnetic Resonance • Narrow-band Power Supply f1/2≈ 200 Hz 1 µm  400 Hz

  7. Detuning • Microphonics • Lorentz Force

  8. Pulse Mode

  9. Lorentz Force Detuning 35 MV/m  500 ~ 600 Hz

  10. Tuning

  11. Pre-Load

  12. Data Analysis • Tension! • Fickle Calibration

  13. Measurement Equipment

  14. Measurement Sensitivities SS 316 E = 193 GPa 50 lbs  11.5 µε  8 mΩ

  15. Temperature Calibration, SG @ 5 K, 80 mK  8 mΩ

  16. RTD Calibration @ 5 K, 80 mK  4 Ω

  17. Performance Profile • LabVIEW 8.2 • NI-DMM 2.7 (PXI 4071) • NI-SWITCH 3.3 (PXI 2501) Range Resolution Current 100  ……10 μ ............1 mA 1 k.............100 μ ..........1 mA 10 k ……...1 m..............100 μA 100 k …….10 m............10 μA 1 M............100 m .........10 μA 10 M..........1  ................1 μA • Vishay Resistor • 350 Ω (0.005%) • 4-wire measurement • Resolution • Noise Reduction Mode • Aperture Time

  18. Performance Profile SG: 8 mΩ *Time is seconds for switching and reading 50 point multipoint *Each set of statistics covers 5,000 measurements

  19. Performance Profile • RTD: • 4 Ω • 1 µA *Time is seconds for switching and reading 50 point multipoint *Each set of statistics covers 5,000 measurements

  20. Performance Profile • RTD: • 4 Ω • 1 µA *Time is seconds for switch connect and 20 point multipoint read *Range is 10 MΩ for all. *Each set of statistics covers 200 measurements.

  21. Sensor Improvements • Reliability • Accuracy • How? • Decrease demands

  22. Bullet Modification • Material • SS 316: E = 193 GPa • Al 2014-T4: E= 70 GPa • Nearly 3 times the strain • Size • 10 x 10 x 10 mm • 7.5 x 7.5 x 10 mm • Nearly 2 times the stress • Industry standard for • measurements: 1000-1500 µε • Improve from 115 µε to ~600 µε • 50 lbs: 8 mΩ 40 mΩ • 80 mK  400 mK

  23. Bullet Modification *Bullet material requirements and properties for a 7.5 x 7.5 x 10 mm bullet of aluminum 2014-T4

  24. Gauge Modification • Placement of Temperature Sensors

  25. Gauge Modification • Gauge Selection • 4 K  Karma-alloy • S-T-C number

  26. Gauge Modification • Gauge Configuration • Wheatstone Bridge Full Poisson Bridge

  27. Gauge Modification • Gauge Configuration • Wheatstone Bridge Half Bridge (Bending)

  28. Conclusion • Cavity Resonance Control • Piezostack Preload • Bullet & Strain Gauge • Temperature Compensation • New: • Bullet • SG Configuration • Control & Measurement Hardware

  29. Questions? C1C Adam Stooke USAF Academy Physics Department Supervisor: Yuriy Pischalnikov Technical Division C08Adam.Stooke@usafa.af.mil

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