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Booster Dampers Update

This update discusses the latest advancements in booster dampers, including the transverse damper's RF lock status, which has shown no loss since the recent fix. The new firmware, featuring Timofey Zolkin's n-turn filter coefficients, is now installed, and testing and verification are underway. We outline the basic timing and filter algorithm improvements in the longitudinal damper's block diagram. Testing includes performance measurements utilizing MATLAB simulations, with plans to optimize filtering and demonstrate damping efficiency in the booster system.

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Booster Dampers Update

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  1. Booster Dampers Update Nathan Eddy PIP Meeting 4/30/14

  2. Transverse Damper • RF Lock – No loss of lock since “fix” • New Firmware with TimofeyZolkin’s n-turn filter coefficients installed • Testing and verification underway • Basic Timing, Filter Algorithm, Tune Monitor

  3. Longitudinal Damper

  4. LD Block Diagram NCO cos NCO cos CIC Dec BP FIR -45° Mɸ CIC Interp 4*RF ~211MS/s 4*RF ~211MS/s x x + ADC DAC Σ ~25KHz + - CIC Dec BP FIR +45° Mɸ CIC Interp x x NCO sin NCO sin Same NCO generates sin, cos for I,Q mixing NCO frequency is centered on rev harmonic of interest Set CIC decimation so that notches on RevF BP FIR is a N tap filter for signal conditioning Mɸ correspond to programmable magnitude/phase shift For output sum, +/- select upper/lower sideband (SSB) Will also suppress carrier Note, this same firmware design can be used for “direct sideband” detection by adjusting the NCO frequency and modifying the FIR filter coefficients

  5. Test Installation Notch Filter RF Ref TCLK BP Filter Mode N Pickup Digital Damper RF Ref WCM Phase Pickup Mode 1

  6. RAW Data 15ms MODE 50

  7. RAW Data Zoom After 90MHz LP Filter

  8. Mode 50 after DDC

  9. Import into Matlab

  10. Simple Matlab Simulation

  11. Summary NCO cos NCO cos CIC Dec BP FIR -45° Mɸ CIC Interp 4*RF ~211MS/s 4*RF ~211MS/s x x + ADC DAC Σ ~25KHz + - CIC Dec BP FIR +45° Mɸ CIC Interp x x NCO sin NCO sin ADC through CICdec implemented and tested in Booster CICint and DAC tested on bench Design as shown under checkout right now Expect to begin testing in Booster this week To Do List Develop complete Matlab Simulation Allow ability to optimize filtering Implement Beam Transfer Function Measurement for open and closed loop measurements Straightforward method to optimize gain/phase Demonstrate damping on single Booster Mode

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