07 Aug 2007 C1C Adam Stooke USAF Academy Physics Department SIST Outbrief Supervisor: Yuriy Pischalnikov, Technical Division Resonance Control: Pre-Load & A Case Study in Measurement Outline Superconducting Radio Frequency (SCRF) Cavities Resonance & Tuning Measuring the Preload Current Configuration New Hardware Profile Recommended Improvements Superconducting RF Cavity Operational Hurdle: Cost Energy/Power Consumption Land, Materials, Production Precision Energy Savings SC RF Cavities Electromagnetic Resonance Narrow-band Power Supply 1.3 GHz f 1/2 f 1/2 200 Hz 1 m 400 Hz Detuning Microphonics Lorentz Force Pulse Mode Lorentz Force Detuning 35 MV/m 500 ~ 600 Hz Tuning Pre-Load Data Analysis Tension! Fickle Calibration Measurement Equipment Measurement Sensitivities SS 316 E = 193 GPa 50 lbs 11.5 8 m Temperature Calibration, 5 K, 80 mK 8 m RTD 5 K, 80 mK 4 Performance Profile Range Resolution Current 100 10 mA 1 k mA 10 k ...1 m A 100 k .10 m A 1 M m A 10 M A Resolution Noise Reduction Mode Aperture Time LabVIEW 8.2 NI-DMM 2.7 (PXI 4071) NI-SWITCH 3.3 (PXI 2501) Vishay Resistor 350 (0.005%) 4-wire measurement Performance Profile SETTINGSRESULTS Range: 1 k Resolution: 7 = Range = Noise- rej: high-orderApt. time: 6 = Time = 5.2 Range: 10 k Resolution: 7 = Range = Noise- rej: high-orderApt. time: 6 = Time = 5.4 Range: 1 k Resolution: 7 = Range = Noise- rej: second-orderApt. time: 2 = Time = 1.9 Range: 10 k Resolution: 7 = Range = 0.11 Noise- rej: second-orderApt. time: 2 = 0.030Time = 2.1 Range: 1 k Resolution: 7 = Range = Noise- rej: normalApt. time: 1 = Time = 1.1 Range: 10 k Resolution: 7 = Range = Noise- rej: normalApt. time: 1 = Time = 1.3 *Time is seconds for switching and reading 50 point multipoint*Each set of statistics covers 5,000 measurements SG: 8 m Performance Profile *Time is seconds for switching and reading 50 point multipoint*Each set of statistics covers 5,000 measurements SETTINGSRESULTS Range: 100 k Resolution: 7 = Range = Noise- rej: high-orderApt. time: 6 = 0.20Time = 6.4 Range: 1 M Resolution: 7 = Range = 3.81 Noise- rej: high-orderApt. time: 6 = 0.68Time = 10.2 Range: 100 k Resolution: 7 = Range = Noise- rej: second-orderApt. time: 2 = 0.038Time = 3.1 Range: 1 M Resolution: 7 = 319.4Range = Noise- rej: second-orderApt. time: 2 = 1.0Time = 6.9 Range: 100 k Resolution: 7 = Range = Noise- rej: normalApt. time: 1 = 0.038Time = 2.3 Range: 1 M Resolution: 7 = 320.6Range = Noise- rej: normalApt. time: 1 = 2.1Time = 6.0 RTD: 4 1 A Performance Profile *Time is seconds for switch connect and 20 point multipoint read *Each set of statistics covers 200 measurements. SETTINGSRESULTS Resolution: 5 Noise- rej: high-order = = 7.1 Range = Time = 5.08 Resolution: 6 Noise- rej: high-order = = 0.82 Range = Time = 9.9 Resolution: 7 Noise- rej: high-order = = 0.36 Range = Time = 32 Resolution: 5 Noise- rej: second-order = = 7.6 Range = Time = 5.2 Resolution: 6 Noise- rej: second-order = = 0.86 Range = 4.93 Time = 9.9 Resolution: 7 Noise- rej: second-order = = 0.34 Range = Time = 32 Resolution: 5 Noise- rej: normal = 348 = 13 Range = Time = 5.2 Resolution: 6 Noise- rej: normal = = 0.76 Range = Time = 9.9 Resolution: 7 Noise- rej: normal = = 0.36 Range = Time = 32 *Range is 10 M for all. RTD: 4 1 A Sensor Improvements Reliability Accuracy How? Decrease demands 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: 50 lbs: 8 m 40 m 80 mK 400 mK Improve from 115 to ~600 Bullet Modification RequirementMaterial Property Maximum Compressive Force: 10,000 N Maximum Compressive Stress: 178 MPa Compressive Strength: 425 MPa Shear Force: 450 N Shear Stress: 64 MPa Shear Strength: 262 MPa Spring constant >> 9 N/m (Latest setting of CuBe 2 disc springs in HTS) Spring constant: 394 N/m (1.93 kN/m for SS 316, 1 cm 3 ) *Bullet material requirements and properties for a 7.5 x 7.5 x 10 mm bullet of aluminum 2014-T4 Gauge Modification Placement of Temperature Sensors Gauge Modification Gauge Selection 4 K Karma-alloy S-T-C number Gauge Modification Gauge Configuration Wheatstone Bridge Full Poisson Bridge Gauge Modification Gauge Configuration Wheatstone Bridge Half Bridge (Bending) Conclusion Cavity Resonance Control Piezostack Preload Bullet & Strain Gauge Temperature Compensation New: Bullet SG Configuration Control & Measurement Hardware Questions? C1C Adam Stooke USAF Academy Physics Department Supervisor: Yuriy Pischalnikov Technical Division