Booster Dampers Update Nathan Eddy PIP Meeting 4/30/14.
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Transcript of Booster Dampers Update Nathan Eddy PIP Meeting 4/30/14.
Booster Dampers Update
Nathan EddyPIP Meeting
4/30/14
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
Longitudinal Damper
LD Block Diagram
ADC
x
x
CICDec
CICDec
BP FIR-45°
BP FIR+45°
Mɸ
Mɸ
CICInterp
CICInterp
x
x
Σ DAC
+
+ -
Same NCO generates sin, cos for I,Q mixing NCO frequency is centered on rev harmonic of interestSet CIC decimation so that notches on RevFBP FIR is a N tap filter for signal conditioningMɸ correspond to programmable magnitude/phase shiftFor output sum, +/- select upper/lower sideband (SSB) Will also suppress carrierNote, this same firmware design can be used for “direct sideband” detection by adjusting the NCO frequency and modifying the FIR filter coefficients
NCOcos
NCOsin
NCOsin
NCOcos
4*RF ~211MS/s
4*RF ~211MS/s
~25KHz
Test Installation
WCMPhase PickupMode 1
DigitalDamper
Mode N
NotchFilter
BPFilter
Pickup
RF RefTCLK
RF Ref
RAW Data
MODE 50
15ms
RAW Data ZoomAfter 90MHz LP Filter
Mode 50 after DDC
Import into Matlab
Simple Matlab Simulation
Summary
ADC
x
x
CICDec
CICDec
BP FIR-45°
BP FIR+45°
Mɸ
Mɸ
CICInterp
CICInterp
x
x
Σ DAC
+
+ -
ADC through CICdec implemented and tested in BoosterCICint and DAC tested on benchDesign 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
NCOcos
NCOsin
NCOsin
NCOcos
4*RF ~211MS/s
4*RF ~211MS/s
~25KHz