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Automated Programmable Isolation Amplifier Calibrator

Automated Programmable Isolation Amplifier Calibrator. Gabriel Vega. Presentation Outline. The Fermi National Accelerator Laboratory The Tevatron Superconducting Magnets Programmable Isolation Amplifiers Quench Detection and Protection Calibration Automated Calibrator Conclusion.

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Automated Programmable Isolation Amplifier Calibrator

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  1. Automated Programmable Isolation Amplifier Calibrator Gabriel Vega

  2. Presentation Outline • The Fermi National Accelerator Laboratory • The Tevatron • Superconducting Magnets • Programmable Isolation Amplifiers • Quench Detection and Protection • Calibration • Automated Calibrator • Conclusion

  3. The Fermi National Accelerator Laboratory (Fermilab) is one of the world’s leading research facilities for Particle Physics and Astrophysics. Fermilab contains the most powerful particle accelerator in the world, The Tevatron. Fermilab

  4. Particle Acceleration: Ions are passed through a series of primary accelerators to increase their speed and energy. Protons and Anti-protons are then injected into the final accelerator (Tevatron), in opposing paths. When the proton and anti-protons gather ~1 TeV in the Tevatron, they are collided with one another at one of the two detector halls at Fermilab. How are the particles contained in the accelerator? The Tevatron

  5. Superconducting Magnets • Superconducting Magnets: • Dipole Magnets bend the particle beam’s path • Quadrupole Magnets focus or defocus the particle beam • Niobium-Titanium Alloy Wire • No Resistance (Ideally) • Quench

  6. Programmable Isolation Amplifiers • 8 Channels VME Card • Analog Devices AD210 3-Port Isolation Amplifier • Modulator • Transformer • Demodulator

  7. IsoAmp Implementation Channel # - Quench Detection and Protection System Superconducting Magnet Voltage ADC + • Isolates Magnet from Quench Detection System • V = IR

  8. Calibration: Previous Method • HyperTerminal • Manual Control of Power Supply, DMM, and Channel Selection • Manual Entry of Data into Excel Spreadsheet

  9. Calibration: Automated System LabView VI MVME1600 VME Processor BANK A BANK C IsoAmp Card 0 . . . 7 0 . . . 7 Channel 0 . . . Channel 7 Fluke 5440B Power Supply HP 3458A Multimeter Keithley 7001 Switch Card BANK A and BANK C

  10. Hardware Setup • GPIB • Power Supply • Keithley Switch Card • Multimeter • Serial • VME Processor • VME bus • IsoAmp VME Card

  11. Software: Initialize Power on/reset VME crate and Press Initialize Button Write vmeiomap\n Read address map Read VME Processor Information NO NO Read Size\s(bytes)\n\r\n\r ? Store IsoAmp Address YES Read mtfvx18 -> ? YES NO Read mtfvx18 -> ? YES Write ia8\n, invoice #, and IsoAmp address Turn on “Ready” LED

  12. Software: Scan • Calibration Phase • Pre-Calibration • Attenuation 1, 2, 3 • Post-Calibration • Input Voltage • 50V, -50V • 5V, -5V • 0.5V, -0.5V • Gain • 0.1, 1, 10 • Graph • Output data and average of DMM values • Load Values to Table

  13. Software: Scan Flowchart Set Ring Values and Press Scan Button Switch On Channel 0…7 BANK A and BANK C Power Supply: Operation Mode Write Gain values to all channels Multimeter: 5 samples Read VME Processor Feedback NO Average Samples and Show on graph Read iaExec\s-\sOK ? Send Average to Indicator Power Supply: Standby YES Switch Off Channel 0…7 BANK A and BANK C NO Exit Routine Channel 7 ? YES

  14. Software: Write Gains • minGain = (Vout1 – Vout2)/10 • att_weak = (Vout3 – Vout4)/10/ (Vout1 – Vout2) • att_strong = (Vout5 – Vout6)/10/ (Vout1 – Vout2)

  15. Software: Pass-Fail • Pre-Calibration Values • +/- 5%

  16. Conclusion • A LabView program was developed to create an automated calibrator for the isolation amplifiers at the Magnet Test Facility. • Calibration time is reduced from about 2 hrs. to about 25 minutes. • Future Areas of Improvement: • National Instruments VME-MXI-2

  17. Acknowledgements • Sincere Thanks: • Fermilab • The SIST Committee • Ruben Carcagno and Roger Nehring • Dr. Davenport • Images From: • www.fnal.gov • Technical Division at Fermilab

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