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 Timofey Zolkin’s n-turn filter coefficients installed Testing and verification underway – Basic Timing, Filter Algorithm, Tune Monitor

3. Longitudinal Damper

4. LD Block Diagram ADC x x CIC Dec CIC Dec BP FIR -45° BP FIR +45° Mɸ CIC Interp CIC Interp x x Σ DAC + + - 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 NCO cos NCO sin NCO sin NCO cos 4*RF ~211MS/s 4*RF ~211MS/s ~25KHz

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

6. RAW Data MODE 50 15ms

7. RAW Data Zoom After 90MHz LP Filter

8. Mode 50 after DDC

9. Import into Matlab

10. Simple Matlab Simulation

11. Summary ADC x x CIC Dec CIC Dec BP FIR -45° BP FIR +45° Mɸ CIC Interp CIC Interp x x Σ DAC + + - 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 NCO cos NCO sin NCO sin NCO cos 4*RF ~211MS/s 4*RF ~211MS/s ~25KHz